From d47bf8b6c4365a5c0a13c69f2f5d1260511a66e5 Mon Sep 17 00:00:00 2001 From: Joffrey JAFFEUX Date: Thu, 16 May 2019 10:34:19 +0200 Subject: [PATCH] SECURITY: updates lodash from 1.3.0 to 4.17.5 (#7546) --- .../admin/models/color-scheme.js.es6 | 4 +- .../javascripts/admin/models/theme.js.es6 | 2 +- app/assets/javascripts/application.js | 2 +- .../discourse/components/emoji-picker.js.es6 | 2 +- .../discourse/components/quote-button.js.es6 | 3 +- .../components/topic-timer-info.js.es6 | 2 +- .../discourse/controllers/flag.js.es6 | 2 +- .../controllers/preferences/interface.js.es6 | 6 +- .../discourse/lib/category-tag-search.js.es6 | 3 +- .../javascripts/discourse/lib/computed.js.es6 | 2 +- .../discourse/lib/keyboard-shortcuts.js.es6 | 4 +- .../discourse/lib/safari-hacks.js.es6 | 5 +- .../javascripts/discourse/lib/throttle.js.es6 | 18 + .../discourse/lib/user-search.js.es6 | 3 +- .../discourse/models/composer.js.es6 | 5 +- .../models/topic-tracking-state.js.es6 | 8 +- .../discourse/models/user-stream.js.es6 | 2 +- .../discourse/widgets/post-links.js.es6 | 5 +- .../components/keyboard-shortcuts-test.js.es6 | 4 +- vendor/assets/javascripts/lodash.js | 12882 +++++++++------- 20 files changed, 7563 insertions(+), 5401 deletions(-) create mode 100644 app/assets/javascripts/discourse/lib/throttle.js.es6 diff --git a/app/assets/javascripts/admin/models/color-scheme.js.es6 b/app/assets/javascripts/admin/models/color-scheme.js.es6 index baf0d8c693c..5276ef849d0 100644 --- a/app/assets/javascripts/admin/models/color-scheme.js.es6 +++ b/app/assets/javascripts/admin/models/color-scheme.js.es6 @@ -45,7 +45,7 @@ const ColorScheme = Discourse.Model.extend(Ember.Copyable, { changed(name) { if (!this.originals) return false; if (this.originals.name !== name) return true; - if (_.any(this.colors, c => c.get("changed"))) return true; + if (this.colors.any(c => c.get("changed"))) return true; return false; }, @@ -56,7 +56,7 @@ const ColorScheme = Discourse.Model.extend(Ember.Copyable, { return false; } - return !changed || this.saving || _.any(this.colors, c => !c.get("valid")); + return !changed || this.saving || this.colors.any(c => !c.get("valid")); }, newRecord: Ember.computed.not("id"), diff --git a/app/assets/javascripts/admin/models/theme.js.es6 b/app/assets/javascripts/admin/models/theme.js.es6 index 1de1a6a2902..0439321fe5b 100644 --- a/app/assets/javascripts/admin/models/theme.js.es6 +++ b/app/assets/javascripts/admin/models/theme.js.es6 @@ -138,7 +138,7 @@ const Theme = RestModel.extend({ @computed("theme_fields", "theme_fields.@each.error") isBroken(fields) { return ( - fields && fields.some(field => field.error && field.error.length > 0) + fields && fields.any(field => field.error && field.error.length > 0) ); }, diff --git a/app/assets/javascripts/application.js b/app/assets/javascripts/application.js index 81e09b2adfd..180df64af24 100644 --- a/app/assets/javascripts/application.js +++ b/app/assets/javascripts/application.js @@ -24,6 +24,7 @@ //= require ./discourse/lib/lock-on //= require ./discourse/lib/url //= require ./discourse/lib/debounce +//= require ./discourse/lib/throttle //= require ./discourse/lib/quote //= require ./discourse/lib/key-value-store //= require ./discourse/lib/computed @@ -53,7 +54,6 @@ //= require ./discourse/lib/export-csv //= require ./discourse/lib/autocomplete //= require ./discourse/lib/after-transition -//= require ./discourse/lib/debounce //= require ./discourse/lib/safari-hacks //= require_tree ./discourse/adapters //= require ./discourse/models/post-action-type diff --git a/app/assets/javascripts/discourse/components/emoji-picker.js.es6 b/app/assets/javascripts/discourse/components/emoji-picker.js.es6 index 1f949d8b07a..7ea07b9b961 100644 --- a/app/assets/javascripts/discourse/components/emoji-picker.js.es6 +++ b/app/assets/javascripts/discourse/components/emoji-picker.js.es6 @@ -598,7 +598,7 @@ export default Ember.Component.extend({ }, _scrollTo(y) { - const yPosition = _.isUndefined(y) ? this.scrollPosition : y; + const yPosition = typeof y === "undefined" ? this.scrollPosition : y; this.$list.scrollTop(yPosition); diff --git a/app/assets/javascripts/discourse/components/quote-button.js.es6 b/app/assets/javascripts/discourse/components/quote-button.js.es6 index b26f891d735..2db85835beb 100644 --- a/app/assets/javascripts/discourse/components/quote-button.js.es6 +++ b/app/assets/javascripts/discourse/components/quote-button.js.es6 @@ -1,3 +1,4 @@ +import debounce from "discourse/lib/debounce"; import { selectedText } from "discourse/lib/utilities"; export default Ember.Component.extend({ @@ -122,7 +123,7 @@ export default Ember.Component.extend({ didInsertElement() { const { isWinphone, isAndroid } = this.capabilities; const wait = isWinphone || isAndroid ? 250 : 25; - const onSelectionChanged = _.debounce(() => this._selectionChanged(), wait); + const onSelectionChanged = debounce(() => this._selectionChanged(), wait); $(document) .on("mousedown.quote-button", e => { diff --git a/app/assets/javascripts/discourse/components/topic-timer-info.js.es6 b/app/assets/javascripts/discourse/components/topic-timer-info.js.es6 index 5ef9ad796e8..fed1d14f970 100644 --- a/app/assets/javascripts/discourse/components/topic-timer-info.js.es6 +++ b/app/assets/javascripts/discourse/components/topic-timer-info.js.es6 @@ -53,7 +53,7 @@ export default Ember.Component.extend( if (categoryId) { const category = Category.findById(categoryId); - options = _.assign( + options = Object.assign( { categoryName: category.get("slug"), categoryUrl: category.get("url") diff --git a/app/assets/javascripts/discourse/controllers/flag.js.es6 b/app/assets/javascripts/discourse/controllers/flag.js.es6 index 2c0fd7704c5..88719741176 100644 --- a/app/assets/javascripts/discourse/controllers/flag.js.es6 +++ b/app/assets/javascripts/discourse/controllers/flag.js.es6 @@ -67,7 +67,7 @@ export default Ember.Controller.extend(ModalFunctionality, { this.set("topicActionByName", lookup); return this.site.get("topic_flag_types").filter(item => { - return _.any(this.get("model.actions_summary"), a => { + return this.get("model.actions_summary").some(a => { return a.id === item.get("id") && a.can_act; }); }); diff --git a/app/assets/javascripts/discourse/controllers/preferences/interface.js.es6 b/app/assets/javascripts/discourse/controllers/preferences/interface.js.es6 index ed36721e386..f0ed39f8c4f 100644 --- a/app/assets/javascripts/discourse/controllers/preferences/interface.js.es6 +++ b/app/assets/javascripts/discourse/controllers/preferences/interface.js.es6 @@ -112,7 +112,11 @@ export default Ember.Controller.extend(PreferencesTabController, { @computed() userSelectableHome() { - let homeValues = _.invert(USER_HOMES); + let homeValues = {}; + Object.keys(USER_HOMES).forEach(newValue => { + const newKey = USER_HOMES[newValue]; + homeValues[newKey] = newValue; + }); let result = []; this.siteSettings.top_menu.split("|").forEach(m => { diff --git a/app/assets/javascripts/discourse/lib/category-tag-search.js.es6 b/app/assets/javascripts/discourse/lib/category-tag-search.js.es6 index 1b9ce649690..164839fabf0 100644 --- a/app/assets/javascripts/discourse/lib/category-tag-search.js.es6 +++ b/app/assets/javascripts/discourse/lib/category-tag-search.js.es6 @@ -1,3 +1,4 @@ +import debounce from "discourse/lib/debounce"; import { CANCELLED_STATUS } from "discourse/lib/autocomplete"; import Category from "discourse/models/category"; import { TAG_HASHTAG_POSTFIX } from "discourse/lib/tag-hashtags"; @@ -19,7 +20,7 @@ function searchTags(term, categories, limit) { resolve(CANCELLED_STATUS); }, 5000); - const debouncedSearch = _.debounce((q, cats, resultFunc) => { + const debouncedSearch = debounce((q, cats, resultFunc) => { oldSearch = $.ajax(Discourse.getURL("/tags/filter/search"), { type: "GET", cache: true, diff --git a/app/assets/javascripts/discourse/lib/computed.js.es6 b/app/assets/javascripts/discourse/lib/computed.js.es6 index 52788ddca9b..c97c0d0ec15 100644 --- a/app/assets/javascripts/discourse/lib/computed.js.es6 +++ b/app/assets/javascripts/discourse/lib/computed.js.es6 @@ -104,7 +104,7 @@ export function endWith() { const substring = args.pop(); const computed = Ember.computed(function() { const self = this; - return _.all( + return _.every( args.map(function(a) { return self.get(a); }), diff --git a/app/assets/javascripts/discourse/lib/keyboard-shortcuts.js.es6 b/app/assets/javascripts/discourse/lib/keyboard-shortcuts.js.es6 index 000cc335a4c..590f9161556 100644 --- a/app/assets/javascripts/discourse/lib/keyboard-shortcuts.js.es6 +++ b/app/assets/javascripts/discourse/lib/keyboard-shortcuts.js.es6 @@ -410,13 +410,13 @@ export default { _globalBindToFunction(func, binding) { if (typeof this[func] === "function") { - this.keyTrapper.bindGlobal(binding, _.bind(this[func], this)); + this.keyTrapper.bindGlobal(binding, this[func].bind(this)); } }, _bindToFunction(func, binding) { if (typeof this[func] === "function") { - this.keyTrapper.bind(binding, _.bind(this[func], this)); + this.keyTrapper.bind(binding, this[func].bind(this)); } }, diff --git a/app/assets/javascripts/discourse/lib/safari-hacks.js.es6 b/app/assets/javascripts/discourse/lib/safari-hacks.js.es6 index eeadb1c3f8a..9ca0eedafeb 100644 --- a/app/assets/javascripts/discourse/lib/safari-hacks.js.es6 +++ b/app/assets/javascripts/discourse/lib/safari-hacks.js.es6 @@ -1,3 +1,4 @@ +import debounce from "discourse/lib/debounce"; import { isAppleDevice, safariHacksDisabled } from "discourse/lib/utilities"; // we can't tell what the actual visible window height is @@ -106,7 +107,7 @@ function positioningWorkaround($fixedElement) { positioningWorkaround.blur(evt); }; - var blurred = _.debounce(blurredNow, 250); + var blurred = debounce(blurredNow, 250); var positioningHack = function(evt) { const self = this; @@ -161,7 +162,7 @@ function positioningWorkaround($fixedElement) { } } - const checkForInputs = _.debounce(function() { + const checkForInputs = debounce(function() { $fixedElement .find( "button:not(.hide-preview),a:not(.mobile-file-upload):not(.toggle-toolbar)" diff --git a/app/assets/javascripts/discourse/lib/throttle.js.es6 b/app/assets/javascripts/discourse/lib/throttle.js.es6 new file mode 100644 index 00000000000..2e8673203ba --- /dev/null +++ b/app/assets/javascripts/discourse/lib/throttle.js.es6 @@ -0,0 +1,18 @@ +/** + Throttle a Javascript function. This means if it's called many times in a time limit it + should only be executed one time at most during this time limit + Original function will be called with the context and arguments from the last call made. +**/ +export default function(func, spacing, immediate) { + let self, args; + const later = function() { + func.apply(self, args); + }; + + return function() { + self = this; + args = arguments; + + Ember.run.throttle(null, later, spacing, immediate); + }; +} diff --git a/app/assets/javascripts/discourse/lib/user-search.js.es6 b/app/assets/javascripts/discourse/lib/user-search.js.es6 index 953aeba7ae2..fc2e29a7faf 100644 --- a/app/assets/javascripts/discourse/lib/user-search.js.es6 +++ b/app/assets/javascripts/discourse/lib/user-search.js.es6 @@ -1,3 +1,4 @@ +import debounce from "discourse/lib/debounce"; import { CANCELLED_STATUS } from "discourse/lib/autocomplete"; import { userPath } from "discourse/lib/url"; import { emailValid } from "discourse/lib/utilities"; @@ -61,7 +62,7 @@ function performSearch( }); } -var debouncedSearch = _.debounce(performSearch, 300); +var debouncedSearch = debounce(performSearch, 300); function organizeResults(r, options) { if (r === CANCELLED_STATUS) { diff --git a/app/assets/javascripts/discourse/models/composer.js.es6 b/app/assets/javascripts/discourse/models/composer.js.es6 index a4a6ec9532e..6328b9477c6 100644 --- a/app/assets/javascripts/discourse/models/composer.js.es6 +++ b/app/assets/javascripts/discourse/models/composer.js.es6 @@ -10,6 +10,7 @@ import { } from "ember-addons/ember-computed-decorators"; import { escapeExpression, tinyAvatar } from "discourse/lib/utilities"; import { propertyNotEqual } from "discourse/lib/computed"; +import throttle from "discourse/lib/throttle"; // The actions the composer can take export const CREATE_TOPIC = "createTopic", @@ -200,13 +201,13 @@ const Composer = RestModel.extend({ }, // view detected user is typing - typing: _.throttle( + typing: throttle( function() { const typingTime = this.typingTime || 0; this.set("typingTime", typingTime + 100); }, 100, - { leading: false, trailing: true } + false ), editingFirstPost: Ember.computed.and("editingPost", "post.firstPost"), diff --git a/app/assets/javascripts/discourse/models/topic-tracking-state.js.es6 b/app/assets/javascripts/discourse/models/topic-tracking-state.js.es6 index e2361e23d46..a5d867a6f75 100644 --- a/app/assets/javascripts/discourse/models/topic-tracking-state.js.es6 +++ b/app/assets/javascripts/discourse/models/topic-tracking-state.js.es6 @@ -337,8 +337,8 @@ const TopicTrackingState = Discourse.Model.extend({ countNew(category_id) { return _.chain(this.states) - .where(isNew) - .where( + .filter(isNew) + .filter( topic => topic.archetype !== "private_message" && !topic.deleted && @@ -359,8 +359,8 @@ const TopicTrackingState = Discourse.Model.extend({ countUnread(category_id) { return _.chain(this.states) - .where(isUnread) - .where( + .filter(isUnread) + .filter( topic => topic.archetype !== "private_message" && !topic.deleted && diff --git a/app/assets/javascripts/discourse/models/user-stream.js.es6 b/app/assets/javascripts/discourse/models/user-stream.js.es6 index dda7b16bc54..35e44cc6612 100644 --- a/app/assets/javascripts/discourse/models/user-stream.js.es6 +++ b/app/assets/javascripts/discourse/models/user-stream.js.es6 @@ -68,7 +68,7 @@ export default RestModel.extend({ // 2) remove the parents that have no children const content = this.content.filter(ua => { - return ["likes", "stars", "edits", "bookmarks"].any(group => { + return ["likes", "stars", "edits", "bookmarks"].some(group => { return ua.get(`childGroups.${group}.items.length`) > 0; }); }); diff --git a/app/assets/javascripts/discourse/widgets/post-links.js.es6 b/app/assets/javascripts/discourse/widgets/post-links.js.es6 index 9038e3b319f..2f973475104 100644 --- a/app/assets/javascripts/discourse/widgets/post-links.js.es6 +++ b/app/assets/javascripts/discourse/widgets/post-links.js.es6 @@ -39,10 +39,7 @@ export default createWidget("post-links", { } // only show incoming - const links = _(this.attrs.links) - .filter(l => l.reflection) - .uniq(true, l => l.title) - .value(); + const links = this.attrs.links.filter(l => l.reflection).uniqBy("title"); if (links.length === 0) { return; diff --git a/test/javascripts/components/keyboard-shortcuts-test.js.es6 b/test/javascripts/components/keyboard-shortcuts-test.js.es6 index e126b6d8310..3ae296bbed9 100644 --- a/test/javascripts/components/keyboard-shortcuts-test.js.es6 +++ b/test/javascripts/components/keyboard-shortcuts-test.js.es6 @@ -9,9 +9,9 @@ QUnit.module("lib:keyboard-shortcuts", { testMouseTrap = { bind: function(bindings, callback) { - var registerBinding = _.bind(function(binding) { + var registerBinding = function(binding) { _bindings[binding] = callback; - }, this); + }.bind(this); if (_.isArray(bindings)) { bindings.forEach(registerBinding, this); diff --git a/vendor/assets/javascripts/lodash.js b/vendor/assets/javascripts/lodash.js index d3348caf065..9bd5c3b39bf 100644 --- a/vendor/assets/javascripts/lodash.js +++ b/vendor/assets/javascripts/lodash.js @@ -1,166 +1,804 @@ /** * @license - * Lo-Dash 1.3.0 (Custom Build) - * Build: `lodash minus="template" -d` - * Copyright 2012-2013 The Dojo Foundation - * Based on Underscore.js 1.4.4 - * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud Inc. - * Available under MIT license + * Lodash (Custom Build) + * Build: `lodash include="each,filter,map,range,first,isEmpty,chain,extend,every,omit,merge,union,sortBy,uniq,intersection,reject,compact,reduce,debounce,throttle,values,pick,keys,flatten,min,max,isArray,delay,isString,isEqual,without,invoke,clone" minus="template" -d` + * Copyright JS Foundation and other contributors + * Released under MIT license + * Based on Underscore.js 1.8.3 + * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors */ -;(function(window) { +;(function() { - /** Used as a safe reference for `undefined` in pre ES5 environments */ + /** Used as a safe reference for `undefined` in pre-ES5 environments. */ var undefined; - /** Used to pool arrays and objects used internally */ - var arrayPool = [], - objectPool = []; + /** Used as the semantic version number. */ + var VERSION = '4.17.5'; - /** Used to generate unique IDs */ - var idCounter = 0; + /** Used as the size to enable large array optimizations. */ + var LARGE_ARRAY_SIZE = 200; - /** Used internally to indicate various things */ - var indicatorObject = {}; + /** Error message constants. */ + var FUNC_ERROR_TEXT = 'Expected a function'; - /** Used to prefix keys to avoid issues with `__proto__` and properties on `Object.prototype` */ - var keyPrefix = +new Date + ''; + /** Used to stand-in for `undefined` hash values. */ + var HASH_UNDEFINED = '__lodash_hash_undefined__'; - /** Used as the size when optimizations are enabled for large arrays */ - var largeArraySize = 75; + /** Used as the maximum memoize cache size. */ + var MAX_MEMOIZE_SIZE = 500; - /** Used as the max size of the `arrayPool` and `objectPool` */ - var maxPoolSize = 10; + /** Used as the internal argument placeholder. */ + var PLACEHOLDER = '__lodash_placeholder__'; - /** Used to match empty string literals in compiled template source */ - var reEmptyStringLeading = /\b__p \+= '';/g, - reEmptyStringMiddle = /\b(__p \+=) '' \+/g, - reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g; + /** Used to compose bitmasks for cloning. */ + var CLONE_DEEP_FLAG = 1, + CLONE_FLAT_FLAG = 2, + CLONE_SYMBOLS_FLAG = 4; - /** Used to match HTML entities */ - var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g; + /** Used to compose bitmasks for value comparisons. */ + var COMPARE_PARTIAL_FLAG = 1, + COMPARE_UNORDERED_FLAG = 2; + + /** Used to compose bitmasks for function metadata. */ + var WRAP_BIND_FLAG = 1, + WRAP_BIND_KEY_FLAG = 2, + WRAP_CURRY_BOUND_FLAG = 4, + WRAP_CURRY_FLAG = 8, + WRAP_CURRY_RIGHT_FLAG = 16, + WRAP_PARTIAL_FLAG = 32, + WRAP_PARTIAL_RIGHT_FLAG = 64, + WRAP_ARY_FLAG = 128, + WRAP_REARG_FLAG = 256, + WRAP_FLIP_FLAG = 512; + + /** Used to detect hot functions by number of calls within a span of milliseconds. */ + var HOT_COUNT = 800, + HOT_SPAN = 16; + + /** Used to indicate the type of lazy iteratees. */ + var LAZY_FILTER_FLAG = 1, + LAZY_MAP_FLAG = 2, + LAZY_WHILE_FLAG = 3; + + /** Used as references for various `Number` constants. */ + var INFINITY = 1 / 0, + MAX_SAFE_INTEGER = 9007199254740991, + MAX_INTEGER = 1.7976931348623157e+308, + NAN = 0 / 0; + + /** Used as references for the maximum length and index of an array. */ + var MAX_ARRAY_LENGTH = 4294967295; + + /** Used to associate wrap methods with their bit flags. */ + var wrapFlags = [ + ['ary', WRAP_ARY_FLAG], + ['bind', WRAP_BIND_FLAG], + ['bindKey', WRAP_BIND_KEY_FLAG], + ['curry', WRAP_CURRY_FLAG], + ['curryRight', WRAP_CURRY_RIGHT_FLAG], + ['flip', WRAP_FLIP_FLAG], + ['partial', WRAP_PARTIAL_FLAG], + ['partialRight', WRAP_PARTIAL_RIGHT_FLAG], + ['rearg', WRAP_REARG_FLAG] + ]; + + /** `Object#toString` result references. */ + var argsTag = '[object Arguments]', + arrayTag = '[object Array]', + asyncTag = '[object AsyncFunction]', + boolTag = '[object Boolean]', + dateTag = '[object Date]', + errorTag = '[object Error]', + funcTag = '[object Function]', + genTag = '[object GeneratorFunction]', + mapTag = '[object Map]', + numberTag = '[object Number]', + nullTag = '[object Null]', + objectTag = '[object Object]', + promiseTag = '[object Promise]', + proxyTag = '[object Proxy]', + regexpTag = '[object RegExp]', + setTag = '[object Set]', + stringTag = '[object String]', + symbolTag = '[object Symbol]', + undefinedTag = '[object Undefined]', + weakMapTag = '[object WeakMap]'; + + var arrayBufferTag = '[object ArrayBuffer]', + dataViewTag = '[object DataView]', + float32Tag = '[object Float32Array]', + float64Tag = '[object Float64Array]', + int8Tag = '[object Int8Array]', + int16Tag = '[object Int16Array]', + int32Tag = '[object Int32Array]', + uint8Tag = '[object Uint8Array]', + uint8ClampedTag = '[object Uint8ClampedArray]', + uint16Tag = '[object Uint16Array]', + uint32Tag = '[object Uint32Array]'; + + /** Used to match property names within property paths. */ + var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/, + reIsPlainProp = /^\w*$/, + rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g; /** - * Used to match ES6 template delimiters - * http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6 + * Used to match `RegExp` + * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns). */ - var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g; + var reRegExpChar = /[\\^$.*+?()[\]{}|]/g; - /** Used to match regexp flags from their coerced string values */ + /** Used to match leading and trailing whitespace. */ + var reTrim = /^\s+|\s+$/g; + + /** Used to match wrap detail comments. */ + var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/, + reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/, + reSplitDetails = /,? & /; + + /** Used to match backslashes in property paths. */ + var reEscapeChar = /\\(\\)?/g; + + /** Used to match `RegExp` flags from their coerced string values. */ var reFlags = /\w*$/; - /** Used to match "interpolate" template delimiters */ - var reInterpolate = /<%=([\s\S]+?)%>/g; + /** Used to detect bad signed hexadecimal string values. */ + var reIsBadHex = /^[-+]0x[0-9a-f]+$/i; - /** Used to detect functions containing a `this` reference */ - var reThis = (reThis = /\bthis\b/) && reThis.test(runInContext) && reThis; + /** Used to detect binary string values. */ + var reIsBinary = /^0b[01]+$/i; - /** Used to detect and test whitespace */ - var whitespace = ( - // whitespace - ' \t\x0B\f\xA0\ufeff' + + /** Used to detect host constructors (Safari). */ + var reIsHostCtor = /^\[object .+?Constructor\]$/; - // line terminators - '\n\r\u2028\u2029' + + /** Used to detect octal string values. */ + var reIsOctal = /^0o[0-7]+$/i; - // unicode category "Zs" space separators - '\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000' - ); + /** Used to detect unsigned integer values. */ + var reIsUint = /^(?:0|[1-9]\d*)$/; - /** Used to match leading whitespace and zeros to be removed */ - var reLeadingSpacesAndZeros = RegExp('^[' + whitespace + ']*0+(?=.$)'); + /** Used to compose unicode character classes. */ + var rsAstralRange = '\\ud800-\\udfff', + rsComboMarksRange = '\\u0300-\\u036f', + reComboHalfMarksRange = '\\ufe20-\\ufe2f', + rsComboSymbolsRange = '\\u20d0-\\u20ff', + rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange, + rsVarRange = '\\ufe0e\\ufe0f'; - /** Used to ensure capturing order of template delimiters */ - var reNoMatch = /($^)/; + /** Used to compose unicode capture groups. */ + var rsAstral = '[' + rsAstralRange + ']', + rsCombo = '[' + rsComboRange + ']', + rsFitz = '\\ud83c[\\udffb-\\udfff]', + rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')', + rsNonAstral = '[^' + rsAstralRange + ']', + rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}', + rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]', + rsZWJ = '\\u200d'; - /** Used to match HTML characters */ - var reUnescapedHtml = /[&<>"']/g; + /** Used to compose unicode regexes. */ + var reOptMod = rsModifier + '?', + rsOptVar = '[' + rsVarRange + ']?', + rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*', + rsSeq = rsOptVar + reOptMod + rsOptJoin, + rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')'; - /** Used to match unescaped characters in compiled string literals */ - var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g; + /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */ + var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g'); - /** Used to assign default `context` object properties */ - var contextProps = [ - 'Array', 'Boolean', 'Date', 'Error', 'Function', 'Math', 'Number', 'Object', - 'RegExp', 'String', '_', 'attachEvent', 'clearTimeout', 'isFinite', 'isNaN', - 'parseInt', 'setImmediate', 'setTimeout' - ]; + /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */ + var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange + rsComboRange + rsVarRange + ']'); - /** Used to fix the JScript [[DontEnum]] bug */ - var shadowedProps = [ - 'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable', - 'toLocaleString', 'toString', 'valueOf' - ]; + /** Used to identify `toStringTag` values of typed arrays. */ + var typedArrayTags = {}; + typedArrayTags[float32Tag] = typedArrayTags[float64Tag] = + typedArrayTags[int8Tag] = typedArrayTags[int16Tag] = + typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] = + typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] = + typedArrayTags[uint32Tag] = true; + typedArrayTags[argsTag] = typedArrayTags[arrayTag] = + typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] = + typedArrayTags[dataViewTag] = typedArrayTags[dateTag] = + typedArrayTags[errorTag] = typedArrayTags[funcTag] = + typedArrayTags[mapTag] = typedArrayTags[numberTag] = + typedArrayTags[objectTag] = typedArrayTags[regexpTag] = + typedArrayTags[setTag] = typedArrayTags[stringTag] = + typedArrayTags[weakMapTag] = false; - /** Used to make template sourceURLs easier to identify */ - var templateCounter = 0; + /** Used to identify `toStringTag` values supported by `_.clone`. */ + var cloneableTags = {}; + cloneableTags[argsTag] = cloneableTags[arrayTag] = + cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] = + cloneableTags[boolTag] = cloneableTags[dateTag] = + cloneableTags[float32Tag] = cloneableTags[float64Tag] = + cloneableTags[int8Tag] = cloneableTags[int16Tag] = + cloneableTags[int32Tag] = cloneableTags[mapTag] = + cloneableTags[numberTag] = cloneableTags[objectTag] = + cloneableTags[regexpTag] = cloneableTags[setTag] = + cloneableTags[stringTag] = cloneableTags[symbolTag] = + cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] = + cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true; + cloneableTags[errorTag] = cloneableTags[funcTag] = + cloneableTags[weakMapTag] = false; - /** `Object#toString` result shortcuts */ - var argsClass = '[object Arguments]', - arrayClass = '[object Array]', - boolClass = '[object Boolean]', - dateClass = '[object Date]', - errorClass = '[object Error]', - funcClass = '[object Function]', - numberClass = '[object Number]', - objectClass = '[object Object]', - regexpClass = '[object RegExp]', - stringClass = '[object String]'; + /** Built-in method references without a dependency on `root`. */ + var freeParseInt = parseInt; - /** Used to identify object classifications that `_.clone` supports */ - var cloneableClasses = {}; - cloneableClasses[funcClass] = false; - cloneableClasses[argsClass] = cloneableClasses[arrayClass] = - cloneableClasses[boolClass] = cloneableClasses[dateClass] = - cloneableClasses[numberClass] = cloneableClasses[objectClass] = - cloneableClasses[regexpClass] = cloneableClasses[stringClass] = true; + /** Detect free variable `global` from Node.js. */ + var freeGlobal = typeof global == 'object' && global && global.Object === Object && global; - /** Used to determine if values are of the language type Object */ - var objectTypes = { - 'boolean': false, - 'function': true, - 'object': true, - 'number': false, - 'string': false, - 'undefined': false - }; + /** Detect free variable `self`. */ + var freeSelf = typeof self == 'object' && self && self.Object === Object && self; - /** Used to escape characters for inclusion in compiled string literals */ - var stringEscapes = { - '\\': '\\', - "'": "'", - '\n': 'n', - '\r': 'r', - '\t': 't', - '\u2028': 'u2028', - '\u2029': 'u2029' - }; + /** Used as a reference to the global object. */ + var root = freeGlobal || freeSelf || Function('return this')(); - /** Detect free variable `exports` */ - var freeExports = objectTypes[typeof exports] && exports; + /** Detect free variable `exports`. */ + var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports; - /** Detect free variable `module` */ - var freeModule = objectTypes[typeof module] && module && module.exports == freeExports && module; + /** Detect free variable `module`. */ + var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module; - /** Detect free variable `global`, from Node.js or Browserified code, and use it as `window` */ - var freeGlobal = objectTypes[typeof global] && global; - if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal)) { - window = freeGlobal; - } + /** Detect the popular CommonJS extension `module.exports`. */ + var moduleExports = freeModule && freeModule.exports === freeExports; + + /** Detect free variable `process` from Node.js. */ + var freeProcess = moduleExports && freeGlobal.process; + + /** Used to access faster Node.js helpers. */ + var nodeUtil = (function() { + try { + return freeProcess && freeProcess.binding && freeProcess.binding('util'); + } catch (e) {} + }()); + + /* Node.js helper references. */ + var nodeIsMap = nodeUtil && nodeUtil.isMap, + nodeIsSet = nodeUtil && nodeUtil.isSet, + nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray; /*--------------------------------------------------------------------------*/ /** - * A basic implementation of `_.indexOf` without support for binary searches - * or `fromIndex` constraints. + * A faster alternative to `Function#apply`, this function invokes `func` + * with the `this` binding of `thisArg` and the arguments of `args`. * * @private - * @param {Array} array The array to search. - * @param {Mixed} value The value to search for. - * @param {Number} [fromIndex=0] The index to search from. - * @returns {Number} Returns the index of the matched value or `-1`. + * @param {Function} func The function to invoke. + * @param {*} thisArg The `this` binding of `func`. + * @param {Array} args The arguments to invoke `func` with. + * @returns {*} Returns the result of `func`. */ - function basicIndexOf(array, value, fromIndex) { - var index = (fromIndex || 0) - 1, + function apply(func, thisArg, args) { + switch (args.length) { + case 0: return func.call(thisArg); + case 1: return func.call(thisArg, args[0]); + case 2: return func.call(thisArg, args[0], args[1]); + case 3: return func.call(thisArg, args[0], args[1], args[2]); + } + return func.apply(thisArg, args); + } + + /** + * A specialized version of `_.forEach` for arrays without support for + * iteratee shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Array} Returns `array`. + */ + function arrayEach(array, iteratee) { + var index = -1, + length = array == null ? 0 : array.length; + + while (++index < length) { + if (iteratee(array[index], index, array) === false) { + break; + } + } + return array; + } + + /** + * A specialized version of `_.every` for arrays without support for + * iteratee shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} predicate The function invoked per iteration. + * @returns {boolean} Returns `true` if all elements pass the predicate check, + * else `false`. + */ + function arrayEvery(array, predicate) { + var index = -1, + length = array == null ? 0 : array.length; + + while (++index < length) { + if (!predicate(array[index], index, array)) { + return false; + } + } + return true; + } + + /** + * A specialized version of `_.filter` for arrays without support for + * iteratee shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} predicate The function invoked per iteration. + * @returns {Array} Returns the new filtered array. + */ + function arrayFilter(array, predicate) { + var index = -1, + length = array == null ? 0 : array.length, + resIndex = 0, + result = []; + + while (++index < length) { + var value = array[index]; + if (predicate(value, index, array)) { + result[resIndex++] = value; + } + } + return result; + } + + /** + * A specialized version of `_.includes` for arrays without support for + * specifying an index to search from. + * + * @private + * @param {Array} [array] The array to inspect. + * @param {*} target The value to search for. + * @returns {boolean} Returns `true` if `target` is found, else `false`. + */ + function arrayIncludes(array, value) { + var length = array == null ? 0 : array.length; + return !!length && baseIndexOf(array, value, 0) > -1; + } + + /** + * This function is like `arrayIncludes` except that it accepts a comparator. + * + * @private + * @param {Array} [array] The array to inspect. + * @param {*} target The value to search for. + * @param {Function} comparator The comparator invoked per element. + * @returns {boolean} Returns `true` if `target` is found, else `false`. + */ + function arrayIncludesWith(array, value, comparator) { + var index = -1, + length = array == null ? 0 : array.length; + + while (++index < length) { + if (comparator(value, array[index])) { + return true; + } + } + return false; + } + + /** + * A specialized version of `_.map` for arrays without support for iteratee + * shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Array} Returns the new mapped array. + */ + function arrayMap(array, iteratee) { + var index = -1, + length = array == null ? 0 : array.length, + result = Array(length); + + while (++index < length) { + result[index] = iteratee(array[index], index, array); + } + return result; + } + + /** + * Appends the elements of `values` to `array`. + * + * @private + * @param {Array} array The array to modify. + * @param {Array} values The values to append. + * @returns {Array} Returns `array`. + */ + function arrayPush(array, values) { + var index = -1, + length = values.length, + offset = array.length; + + while (++index < length) { + array[offset + index] = values[index]; + } + return array; + } + + /** + * A specialized version of `_.reduce` for arrays without support for + * iteratee shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @param {*} [accumulator] The initial value. + * @param {boolean} [initAccum] Specify using the first element of `array` as + * the initial value. + * @returns {*} Returns the accumulated value. + */ + function arrayReduce(array, iteratee, accumulator, initAccum) { + var index = -1, + length = array == null ? 0 : array.length; + + if (initAccum && length) { + accumulator = array[++index]; + } + while (++index < length) { + accumulator = iteratee(accumulator, array[index], index, array); + } + return accumulator; + } + + /** + * A specialized version of `_.some` for arrays without support for iteratee + * shorthands. + * + * @private + * @param {Array} [array] The array to iterate over. + * @param {Function} predicate The function invoked per iteration. + * @returns {boolean} Returns `true` if any element passes the predicate check, + * else `false`. + */ + function arraySome(array, predicate) { + var index = -1, + length = array == null ? 0 : array.length; + + while (++index < length) { + if (predicate(array[index], index, array)) { + return true; + } + } + return false; + } + + /** + * Converts an ASCII `string` to an array. + * + * @private + * @param {string} string The string to convert. + * @returns {Array} Returns the converted array. + */ + function asciiToArray(string) { + return string.split(''); + } + + /** + * The base implementation of `_.findIndex` and `_.findLastIndex` without + * support for iteratee shorthands. + * + * @private + * @param {Array} array The array to inspect. + * @param {Function} predicate The function invoked per iteration. + * @param {number} fromIndex The index to search from. + * @param {boolean} [fromRight] Specify iterating from right to left. + * @returns {number} Returns the index of the matched value, else `-1`. + */ + function baseFindIndex(array, predicate, fromIndex, fromRight) { + var length = array.length, + index = fromIndex + (fromRight ? 1 : -1); + + while ((fromRight ? index-- : ++index < length)) { + if (predicate(array[index], index, array)) { + return index; + } + } + return -1; + } + + /** + * The base implementation of `_.indexOf` without `fromIndex` bounds checks. + * + * @private + * @param {Array} array The array to inspect. + * @param {*} value The value to search for. + * @param {number} fromIndex The index to search from. + * @returns {number} Returns the index of the matched value, else `-1`. + */ + function baseIndexOf(array, value, fromIndex) { + return value === value + ? strictIndexOf(array, value, fromIndex) + : baseFindIndex(array, baseIsNaN, fromIndex); + } + + /** + * The base implementation of `_.isNaN` without support for number objects. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`. + */ + function baseIsNaN(value) { + return value !== value; + } + + /** + * The base implementation of `_.property` without support for deep paths. + * + * @private + * @param {string} key The key of the property to get. + * @returns {Function} Returns the new accessor function. + */ + function baseProperty(key) { + return function(object) { + return object == null ? undefined : object[key]; + }; + } + + /** + * The base implementation of `_.reduce` and `_.reduceRight`, without support + * for iteratee shorthands, which iterates over `collection` using `eachFunc`. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @param {*} accumulator The initial value. + * @param {boolean} initAccum Specify using the first or last element of + * `collection` as the initial value. + * @param {Function} eachFunc The function to iterate over `collection`. + * @returns {*} Returns the accumulated value. + */ + function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) { + eachFunc(collection, function(value, index, collection) { + accumulator = initAccum + ? (initAccum = false, value) + : iteratee(accumulator, value, index, collection); + }); + return accumulator; + } + + /** + * The base implementation of `_.sortBy` which uses `comparer` to define the + * sort order of `array` and replaces criteria objects with their corresponding + * values. + * + * @private + * @param {Array} array The array to sort. + * @param {Function} comparer The function to define sort order. + * @returns {Array} Returns `array`. + */ + function baseSortBy(array, comparer) { + var length = array.length; + + array.sort(comparer); + while (length--) { + array[length] = array[length].value; + } + return array; + } + + /** + * The base implementation of `_.times` without support for iteratee shorthands + * or max array length checks. + * + * @private + * @param {number} n The number of times to invoke `iteratee`. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Array} Returns the array of results. + */ + function baseTimes(n, iteratee) { + var index = -1, + result = Array(n); + + while (++index < n) { + result[index] = iteratee(index); + } + return result; + } + + /** + * The base implementation of `_.unary` without support for storing metadata. + * + * @private + * @param {Function} func The function to cap arguments for. + * @returns {Function} Returns the new capped function. + */ + function baseUnary(func) { + return function(value) { + return func(value); + }; + } + + /** + * The base implementation of `_.values` and `_.valuesIn` which creates an + * array of `object` property values corresponding to the property names + * of `props`. + * + * @private + * @param {Object} object The object to query. + * @param {Array} props The property names to get values for. + * @returns {Object} Returns the array of property values. + */ + function baseValues(object, props) { + return arrayMap(props, function(key) { + return object[key]; + }); + } + + /** + * Checks if a `cache` value for `key` exists. + * + * @private + * @param {Object} cache The cache to query. + * @param {string} key The key of the entry to check. + * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. + */ + function cacheHas(cache, key) { + return cache.has(key); + } + + /** + * Gets the number of `placeholder` occurrences in `array`. + * + * @private + * @param {Array} array The array to inspect. + * @param {*} placeholder The placeholder to search for. + * @returns {number} Returns the placeholder count. + */ + function countHolders(array, placeholder) { + var length = array.length, + result = 0; + + while (length--) { + if (array[length] === placeholder) { + ++result; + } + } + return result; + } + + /** + * Gets the value at `key` of `object`. + * + * @private + * @param {Object} [object] The object to query. + * @param {string} key The key of the property to get. + * @returns {*} Returns the property value. + */ + function getValue(object, key) { + return object == null ? undefined : object[key]; + } + + /** + * Checks if `string` contains Unicode symbols. + * + * @private + * @param {string} string The string to inspect. + * @returns {boolean} Returns `true` if a symbol is found, else `false`. + */ + function hasUnicode(string) { + return reHasUnicode.test(string); + } + + /** + * Converts `iterator` to an array. + * + * @private + * @param {Object} iterator The iterator to convert. + * @returns {Array} Returns the converted array. + */ + function iteratorToArray(iterator) { + var data, + result = []; + + while (!(data = iterator.next()).done) { + result.push(data.value); + } + return result; + } + + /** + * Converts `map` to its key-value pairs. + * + * @private + * @param {Object} map The map to convert. + * @returns {Array} Returns the key-value pairs. + */ + function mapToArray(map) { + var index = -1, + result = Array(map.size); + + map.forEach(function(value, key) { + result[++index] = [key, value]; + }); + return result; + } + + /** + * Creates a unary function that invokes `func` with its argument transformed. + * + * @private + * @param {Function} func The function to wrap. + * @param {Function} transform The argument transform. + * @returns {Function} Returns the new function. + */ + function overArg(func, transform) { + return function(arg) { + return func(transform(arg)); + }; + } + + /** + * Replaces all `placeholder` elements in `array` with an internal placeholder + * and returns an array of their indexes. + * + * @private + * @param {Array} array The array to modify. + * @param {*} placeholder The placeholder to replace. + * @returns {Array} Returns the new array of placeholder indexes. + */ + function replaceHolders(array, placeholder) { + var index = -1, + length = array.length, + resIndex = 0, + result = []; + + while (++index < length) { + var value = array[index]; + if (value === placeholder || value === PLACEHOLDER) { + array[index] = PLACEHOLDER; + result[resIndex++] = index; + } + } + return result; + } + + /** + * Gets the value at `key`, unless `key` is "__proto__". + * + * @private + * @param {Object} object The object to query. + * @param {string} key The key of the property to get. + * @returns {*} Returns the property value. + */ + function safeGet(object, key) { + return key == '__proto__' + ? undefined + : object[key]; + } + + /** + * Converts `set` to an array of its values. + * + * @private + * @param {Object} set The set to convert. + * @returns {Array} Returns the values. + */ + function setToArray(set) { + var index = -1, + result = Array(set.size); + + set.forEach(function(value) { + result[++index] = value; + }); + return result; + } + + /** + * A specialized version of `_.indexOf` which performs strict equality + * comparisons of values, i.e. `===`. + * + * @private + * @param {Array} array The array to inspect. + * @param {*} value The value to search for. + * @param {number} fromIndex The index to search from. + * @returns {number} Returns the index of the matched value, else `-1`. + */ + function strictIndexOf(array, value, fromIndex) { + var index = fromIndex - 1, length = array.length; while (++index < length) { @@ -172,5496 +810,6996 @@ } /** - * An implementation of `_.contains` for cache objects that mimics the return - * signature of `_.indexOf` by returning `0` if the value is found, else `-1`. + * Converts `string` to an array. * * @private - * @param {Object} cache The cache object to inspect. - * @param {Mixed} value The value to search for. - * @returns {Number} Returns `0` if `value` is found, else `-1`. + * @param {string} string The string to convert. + * @returns {Array} Returns the converted array. */ - function cacheIndexOf(cache, value) { - var type = typeof value; - cache = cache.cache; - - if (type == 'boolean' || value == null) { - return cache[value]; - } - if (type != 'number' && type != 'string') { - type = 'object'; - } - var key = type == 'number' ? value : keyPrefix + value; - cache = cache[type] || (cache[type] = {}); - - return type == 'object' - ? (cache[key] && basicIndexOf(cache[key], value) > -1 ? 0 : -1) - : (cache[key] ? 0 : -1); + function stringToArray(string) { + return hasUnicode(string) + ? unicodeToArray(string) + : asciiToArray(string); } /** - * Adds a given `value` to the corresponding cache object. + * Converts a Unicode `string` to an array. * * @private - * @param {Mixed} value The value to add to the cache. + * @param {string} string The string to convert. + * @returns {Array} Returns the converted array. */ - function cachePush(value) { - var cache = this.cache, - type = typeof value; + function unicodeToArray(string) { + return string.match(reUnicode) || []; + } - if (type == 'boolean' || value == null) { - cache[value] = true; - } else { - if (type != 'number' && type != 'string') { - type = 'object'; + /*--------------------------------------------------------------------------*/ + + /** Used for built-in method references. */ + var arrayProto = Array.prototype, + funcProto = Function.prototype, + objectProto = Object.prototype; + + /** Used to detect overreaching core-js shims. */ + var coreJsData = root['__core-js_shared__']; + + /** Used to resolve the decompiled source of functions. */ + var funcToString = funcProto.toString; + + /** Used to check objects for own properties. */ + var hasOwnProperty = objectProto.hasOwnProperty; + + /** Used to detect methods masquerading as native. */ + var maskSrcKey = (function() { + var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || ''); + return uid ? ('Symbol(src)_1.' + uid) : ''; + }()); + + /** + * Used to resolve the + * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring) + * of values. + */ + var nativeObjectToString = objectProto.toString; + + /** Used to infer the `Object` constructor. */ + var objectCtorString = funcToString.call(Object); + + /** Used to detect if a method is native. */ + var reIsNative = RegExp('^' + + funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&') + .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$' + ); + + /** Built-in value references. */ + var Buffer = moduleExports ? root.Buffer : undefined, + Symbol = root.Symbol, + Uint8Array = root.Uint8Array, + allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined, + getPrototype = overArg(Object.getPrototypeOf, Object), + objectCreate = Object.create, + propertyIsEnumerable = objectProto.propertyIsEnumerable, + splice = arrayProto.splice, + spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined, + symIterator = Symbol ? Symbol.iterator : undefined, + symToStringTag = Symbol ? Symbol.toStringTag : undefined; + + var defineProperty = (function() { + try { + var func = getNative(Object, 'defineProperty'); + func({}, '', {}); + return func; + } catch (e) {} + }()); + + /* Built-in method references for those with the same name as other `lodash` methods. */ + var nativeCeil = Math.ceil, + nativeGetSymbols = Object.getOwnPropertySymbols, + nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined, + nativeKeys = overArg(Object.keys, Object), + nativeMax = Math.max, + nativeMin = Math.min, + nativeNow = Date.now, + nativeReverse = arrayProto.reverse; + + /* Built-in method references that are verified to be native. */ + var DataView = getNative(root, 'DataView'), + Map = getNative(root, 'Map'), + Promise = getNative(root, 'Promise'), + Set = getNative(root, 'Set'), + WeakMap = getNative(root, 'WeakMap'), + nativeCreate = getNative(Object, 'create'); + + /** Used to store function metadata. */ + var metaMap = WeakMap && new WeakMap; + + /** Used to lookup unminified function names. */ + var realNames = {}; + + /** Used to detect maps, sets, and weakmaps. */ + var dataViewCtorString = toSource(DataView), + mapCtorString = toSource(Map), + promiseCtorString = toSource(Promise), + setCtorString = toSource(Set), + weakMapCtorString = toSource(WeakMap); + + /** Used to convert symbols to primitives and strings. */ + var symbolProto = Symbol ? Symbol.prototype : undefined, + symbolValueOf = symbolProto ? symbolProto.valueOf : undefined, + symbolToString = symbolProto ? symbolProto.toString : undefined; + + /*------------------------------------------------------------------------*/ + + /** + * Creates a `lodash` object which wraps `value` to enable implicit method + * chain sequences. Methods that operate on and return arrays, collections, + * and functions can be chained together. Methods that retrieve a single value + * or may return a primitive value will automatically end the chain sequence + * and return the unwrapped value. Otherwise, the value must be unwrapped + * with `_#value`. + * + * Explicit chain sequences, which must be unwrapped with `_#value`, may be + * enabled using `_.chain`. + * + * The execution of chained methods is lazy, that is, it's deferred until + * `_#value` is implicitly or explicitly called. + * + * Lazy evaluation allows several methods to support shortcut fusion. + * Shortcut fusion is an optimization to merge iteratee calls; this avoids + * the creation of intermediate arrays and can greatly reduce the number of + * iteratee executions. Sections of a chain sequence qualify for shortcut + * fusion if the section is applied to an array and iteratees accept only + * one argument. The heuristic for whether a section qualifies for shortcut + * fusion is subject to change. + * + * Chaining is supported in custom builds as long as the `_#value` method is + * directly or indirectly included in the build. + * + * In addition to lodash methods, wrappers have `Array` and `String` methods. + * + * The wrapper `Array` methods are: + * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift` + * + * The wrapper `String` methods are: + * `replace` and `split` + * + * The wrapper methods that support shortcut fusion are: + * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`, + * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`, + * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray` + * + * The chainable wrapper methods are: + * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`, + * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`, + * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`, + * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`, + * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`, + * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`, + * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`, + * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`, + * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`, + * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`, + * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`, + * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`, + * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`, + * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`, + * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`, + * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`, + * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`, + * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`, + * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`, + * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`, + * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`, + * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`, + * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`, + * `zipObject`, `zipObjectDeep`, and `zipWith` + * + * The wrapper methods that are **not** chainable by default are: + * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`, + * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`, + * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`, + * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`, + * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`, + * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`, + * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`, + * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`, + * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`, + * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`, + * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`, + * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`, + * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`, + * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`, + * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`, + * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`, + * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`, + * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`, + * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`, + * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`, + * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`, + * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`, + * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`, + * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`, + * `upperFirst`, `value`, and `words` + * + * @name _ + * @constructor + * @category Seq + * @param {*} value The value to wrap in a `lodash` instance. + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * function square(n) { + * return n * n; + * } + * + * var wrapped = _([1, 2, 3]); + * + * // Returns an unwrapped value. + * wrapped.reduce(_.add); + * // => 6 + * + * // Returns a wrapped value. + * var squares = wrapped.map(square); + * + * _.isArray(squares); + * // => false + * + * _.isArray(squares.value()); + * // => true + */ + function lodash(value) { + if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) { + if (value instanceof LodashWrapper) { + return value; } - var key = type == 'number' ? value : keyPrefix + value, - typeCache = cache[type] || (cache[type] = {}); - - if (type == 'object') { - if ((typeCache[key] || (typeCache[key] = [])).push(value) == this.array.length) { - cache[type] = false; - } - } else { - typeCache[key] = true; + if (hasOwnProperty.call(value, '__wrapped__')) { + return wrapperClone(value); } } + return new LodashWrapper(value); } /** - * Used by `_.max` and `_.min` as the default `callback` when a given - * `collection` is a string value. + * The base implementation of `_.create` without support for assigning + * properties to the created object. * * @private - * @param {String} value The character to inspect. - * @returns {Number} Returns the code unit of given character. + * @param {Object} proto The object to inherit from. + * @returns {Object} Returns the new object. */ - function charAtCallback(value) { - return value.charCodeAt(0); - } - - /** - * Used by `sortBy` to compare transformed `collection` values, stable sorting - * them in ascending order. - * - * @private - * @param {Object} a The object to compare to `b`. - * @param {Object} b The object to compare to `a`. - * @returns {Number} Returns the sort order indicator of `1` or `-1`. - */ - function compareAscending(a, b) { - var ai = a.index, - bi = b.index; - - a = a.criteria; - b = b.criteria; - - // ensure a stable sort in V8 and other engines - // http://code.google.com/p/v8/issues/detail?id=90 - if (a !== b) { - if (a > b || typeof a == 'undefined') { - return 1; + var baseCreate = (function() { + function object() {} + return function(proto) { + if (!isObject(proto)) { + return {}; } - if (a < b || typeof b == 'undefined') { - return -1; + if (objectCreate) { + return objectCreate(proto); } - } - return ai < bi ? -1 : 1; - } - - /** - * Creates a cache object to optimize linear searches of large arrays. - * - * @private - * @param {Array} [array=[]] The array to search. - * @returns {Null|Object} Returns the cache object or `null` if caching should not be used. - */ - function createCache(array) { - var index = -1, - length = array.length; - - var cache = getObject(); - cache['false'] = cache['null'] = cache['true'] = cache['undefined'] = false; - - var result = getObject(); - result.array = array; - result.cache = cache; - result.push = cachePush; - - while (++index < length) { - result.push(array[index]); - } - return cache.object === false - ? (releaseObject(result), null) - : result; - } - - /** - * Used by `template` to escape characters for inclusion in compiled - * string literals. - * - * @private - * @param {String} match The matched character to escape. - * @returns {String} Returns the escaped character. - */ - function escapeStringChar(match) { - return '\\' + stringEscapes[match]; - } - - /** - * Gets an array from the array pool or creates a new one if the pool is empty. - * - * @private - * @returns {Array} The array from the pool. - */ - function getArray() { - return arrayPool.pop() || []; - } - - /** - * Gets an object from the object pool or creates a new one if the pool is empty. - * - * @private - * @returns {Object} The object from the pool. - */ - function getObject() { - return objectPool.pop() || { - 'args': '', - 'array': null, - 'bottom': '', - 'criteria': null, - 'false': false, - 'firstArg': '', - 'index': 0, - 'init': '', - 'leading': false, - 'loop': '', - 'maxWait': 0, - 'null': false, - 'number': null, - 'object': null, - 'push': null, - 'shadowedProps': null, - 'string': null, - 'top': '', - 'trailing': false, - 'true': false, - 'undefined': false, - 'useHas': false, - 'useKeys': false, - 'value': null + object.prototype = proto; + var result = new object; + object.prototype = undefined; + return result; }; - } + }()); /** - * Checks if `value` is a DOM node in IE < 9. - * - * @private - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true` if the `value` is a DOM node, else `false`. - */ - function isNode(value) { - // IE < 9 presents DOM nodes as `Object` objects except they have `toString` - // methods that are `typeof` "string" and still can coerce nodes to strings - return typeof value.toString != 'function' && typeof (value + '') == 'string'; - } - - /** - * A no-operation function. + * The function whose prototype chain sequence wrappers inherit from. * * @private */ - function noop() { - // no operation performed + function baseLodash() { + // No operation performed. } /** - * Releases the given `array` back to the array pool. + * The base constructor for creating `lodash` wrapper objects. * * @private - * @param {Array} [array] The array to release. + * @param {*} value The value to wrap. + * @param {boolean} [chainAll] Enable explicit method chain sequences. */ - function releaseArray(array) { - if (arrayPool.length == maxPoolSize) { - arrayPool.length = maxPoolSize - 1; - } - array.length = 0; - arrayPool.push(array); + function LodashWrapper(value, chainAll) { + this.__wrapped__ = value; + this.__actions__ = []; + this.__chain__ = !!chainAll; + this.__index__ = 0; + this.__values__ = undefined; + } + + // Ensure wrappers are instances of `baseLodash`. + lodash.prototype = baseLodash.prototype; + lodash.prototype.constructor = lodash; + + LodashWrapper.prototype = baseCreate(baseLodash.prototype); + LodashWrapper.prototype.constructor = LodashWrapper; + + /*------------------------------------------------------------------------*/ + + /** + * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation. + * + * @private + * @constructor + * @param {*} value The value to wrap. + */ + function LazyWrapper(value) { + this.__wrapped__ = value; + this.__actions__ = []; + this.__dir__ = 1; + this.__filtered__ = false; + this.__iteratees__ = []; + this.__takeCount__ = MAX_ARRAY_LENGTH; + this.__views__ = []; } /** - * Releases the given `object` back to the object pool. + * Creates a clone of the lazy wrapper object. * * @private - * @param {Object} [object] The object to release. + * @name clone + * @memberOf LazyWrapper + * @returns {Object} Returns the cloned `LazyWrapper` object. */ - function releaseObject(object) { - var cache = object.cache; - if (cache) { - releaseObject(cache); - } - if (objectPool.length == maxPoolSize) { - objectPool.length = maxPoolSize - 1; - } - object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null; - objectPool.push(object); + function lazyClone() { + var result = new LazyWrapper(this.__wrapped__); + result.__actions__ = copyArray(this.__actions__); + result.__dir__ = this.__dir__; + result.__filtered__ = this.__filtered__; + result.__iteratees__ = copyArray(this.__iteratees__); + result.__takeCount__ = this.__takeCount__; + result.__views__ = copyArray(this.__views__); + return result; } /** - * Slices the `collection` from the `start` index up to, but not including, - * the `end` index. - * - * Note: This function is used, instead of `Array#slice`, to support node lists - * in IE < 9 and to ensure dense arrays are returned. + * Reverses the direction of lazy iteration. * * @private - * @param {Array|Object|String} collection The collection to slice. - * @param {Number} start The start index. - * @param {Number} end The end index. - * @returns {Array} Returns the new array. + * @name reverse + * @memberOf LazyWrapper + * @returns {Object} Returns the new reversed `LazyWrapper` object. */ - function slice(array, start, end) { - start || (start = 0); - if (typeof end == 'undefined') { - end = array ? array.length : 0; - } - var index = -1, - length = end - start || 0, - result = Array(length < 0 ? 0 : length); - - while (++index < length) { - result[index] = array[start + index]; + function lazyReverse() { + if (this.__filtered__) { + var result = new LazyWrapper(this); + result.__dir__ = -1; + result.__filtered__ = true; + } else { + result = this.clone(); + result.__dir__ *= -1; } return result; } - /*--------------------------------------------------------------------------*/ - /** - * Create a new `lodash` function using the given `context` object. + * Extracts the unwrapped value from its lazy wrapper. * - * @static - * @memberOf _ - * @category Utilities - * @param {Object} [context=window] The context object. - * @returns {Function} Returns the `lodash` function. + * @private + * @name value + * @memberOf LazyWrapper + * @returns {*} Returns the unwrapped value. */ - function runInContext(context) { - // Avoid issues with some ES3 environments that attempt to use values, named - // after built-in constructors like `Object`, for the creation of literals. - // ES5 clears this up by stating that literals must use built-in constructors. - // See http://es5.github.com/#x11.1.5. - context = context ? _.defaults(window.Object(), context, _.pick(window, contextProps)) : window; + function lazyValue() { + var array = this.__wrapped__.value(), + dir = this.__dir__, + isArr = isArray(array), + isRight = dir < 0, + arrLength = isArr ? array.length : 0, + view = getView(0, arrLength, this.__views__), + start = view.start, + end = view.end, + length = end - start, + index = isRight ? end : (start - 1), + iteratees = this.__iteratees__, + iterLength = iteratees.length, + resIndex = 0, + takeCount = nativeMin(length, this.__takeCount__); - /** Native constructor references */ - var Array = context.Array, - Boolean = context.Boolean, - Date = context.Date, - Error = context.Error, - Function = context.Function, - Math = context.Math, - Number = context.Number, - Object = context.Object, - RegExp = context.RegExp, - String = context.String, - TypeError = context.TypeError; + if (!isArr || (!isRight && arrLength == length && takeCount == length)) { + return baseWrapperValue(array, this.__actions__); + } + var result = []; - /** - * Used for `Array` method references. - * - * Normally `Array.prototype` would suffice, however, using an array literal - * avoids issues in Narwhal. - */ - var arrayRef = []; + outer: + while (length-- && resIndex < takeCount) { + index += dir; - /** Used for native method references */ - var errorProto = Error.prototype, - objectProto = Object.prototype, - stringProto = String.prototype; + var iterIndex = -1, + value = array[index]; - /** Used to restore the original `_` reference in `noConflict` */ - var oldDash = context._; + while (++iterIndex < iterLength) { + var data = iteratees[iterIndex], + iteratee = data.iteratee, + type = data.type, + computed = iteratee(value); - /** Used to detect if a method is native */ - var reNative = RegExp('^' + - String(objectProto.valueOf) - .replace(/[.*+?^${}()|[\]\\]/g, '\\$&') - .replace(/valueOf|for [^\]]+/g, '.+?') + '$' - ); - - /** Native method shortcuts */ - var ceil = Math.ceil, - clearTimeout = context.clearTimeout, - concat = arrayRef.concat, - floor = Math.floor, - fnToString = Function.prototype.toString, - getPrototypeOf = reNative.test(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf, - hasOwnProperty = objectProto.hasOwnProperty, - push = arrayRef.push, - propertyIsEnumerable = objectProto.propertyIsEnumerable, - setImmediate = context.setImmediate, - setTimeout = context.setTimeout, - toString = objectProto.toString; - - /* Native method shortcuts for methods with the same name as other `lodash` methods */ - var nativeBind = reNative.test(nativeBind = toString.bind) && nativeBind, - nativeCreate = reNative.test(nativeCreate = Object.create) && nativeCreate, - nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray, - nativeIsFinite = context.isFinite, - nativeIsNaN = context.isNaN, - nativeKeys = reNative.test(nativeKeys = Object.keys) && nativeKeys, - nativeMax = Math.max, - nativeMin = Math.min, - nativeParseInt = context.parseInt, - nativeRandom = Math.random, - nativeSlice = arrayRef.slice; - - /** Detect various environments */ - var isIeOpera = reNative.test(context.attachEvent), - isV8 = nativeBind && !/\n|true/.test(nativeBind + isIeOpera); - - /** Used to lookup a built-in constructor by [[Class]] */ - var ctorByClass = {}; - ctorByClass[arrayClass] = Array; - ctorByClass[boolClass] = Boolean; - ctorByClass[dateClass] = Date; - ctorByClass[funcClass] = Function; - ctorByClass[objectClass] = Object; - ctorByClass[numberClass] = Number; - ctorByClass[regexpClass] = RegExp; - ctorByClass[stringClass] = String; - - /** Used to avoid iterating non-enumerable properties in IE < 9 */ - var nonEnumProps = {}; - nonEnumProps[arrayClass] = nonEnumProps[dateClass] = nonEnumProps[numberClass] = { 'constructor': true, 'toLocaleString': true, 'toString': true, 'valueOf': true }; - nonEnumProps[boolClass] = nonEnumProps[stringClass] = { 'constructor': true, 'toString': true, 'valueOf': true }; - nonEnumProps[errorClass] = nonEnumProps[funcClass] = nonEnumProps[regexpClass] = { 'constructor': true, 'toString': true }; - nonEnumProps[objectClass] = { 'constructor': true }; - - (function() { - var length = shadowedProps.length; - while (length--) { - var prop = shadowedProps[length]; - for (var className in nonEnumProps) { - if (hasOwnProperty.call(nonEnumProps, className) && !hasOwnProperty.call(nonEnumProps[className], prop)) { - nonEnumProps[className][prop] = false; + if (type == LAZY_MAP_FLAG) { + value = computed; + } else if (!computed) { + if (type == LAZY_FILTER_FLAG) { + continue outer; + } else { + break outer; } } } - }()); - - /*--------------------------------------------------------------------------*/ - - /** - * Creates a `lodash` object, which wraps the given `value`, to enable method - * chaining. - * - * In addition to Lo-Dash methods, wrappers also have the following `Array` methods: - * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`, - * and `unshift` - * - * Chaining is supported in custom builds as long as the `value` method is - * implicitly or explicitly included in the build. - * - * The chainable wrapper functions are: - * `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`, - * `compose`, `concat`, `countBy`, `createCallback`, `debounce`, `defaults`, - * `defer`, `delay`, `difference`, `filter`, `flatten`, `forEach`, `forIn`, - * `forOwn`, `functions`, `groupBy`, `initial`, `intersection`, `invert`, - * `invoke`, `keys`, `map`, `max`, `memoize`, `merge`, `min`, `object`, `omit`, - * `once`, `pairs`, `partial`, `partialRight`, `pick`, `pluck`, `push`, `range`, - * `reject`, `rest`, `reverse`, `shuffle`, `slice`, `sort`, `sortBy`, `splice`, - * `tap`, `throttle`, `times`, `toArray`, `transform`, `union`, `uniq`, `unshift`, - * `unzip`, `values`, `where`, `without`, `wrap`, and `zip` - * - * The non-chainable wrapper functions are: - * `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `has`, - * `identity`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`, - * `isElement`, `isEmpty`, `isEqual`, `isFinite`, `isFunction`, `isNaN`, - * `isNull`, `isNumber`, `isObject`, `isPlainObject`, `isRegExp`, `isString`, - * `isUndefined`, `join`, `lastIndexOf`, `mixin`, `noConflict`, `parseInt`, - * `pop`, `random`, `reduce`, `reduceRight`, `result`, `shift`, `size`, `some`, - * `sortedIndex`, `runInContext`, `template`, `unescape`, `uniqueId`, and `value` - * - * The wrapper functions `first` and `last` return wrapped values when `n` is - * passed, otherwise they return unwrapped values. - * - * @name _ - * @constructor - * @alias chain - * @category Chaining - * @param {Mixed} value The value to wrap in a `lodash` instance. - * @returns {Object} Returns a `lodash` instance. - * @example - * - * var wrapped = _([1, 2, 3]); - * - * // returns an unwrapped value - * wrapped.reduce(function(sum, num) { - * return sum + num; - * }); - * // => 6 - * - * // returns a wrapped value - * var squares = wrapped.map(function(num) { - * return num * num; - * }); - * - * _.isArray(squares); - * // => false - * - * _.isArray(squares.value()); - * // => true - */ - function lodash(value) { - // don't wrap if already wrapped, even if wrapped by a different `lodash` constructor - return (value && typeof value == 'object' && !isArray(value) && hasOwnProperty.call(value, '__wrapped__')) - ? value - : new lodashWrapper(value); + result[resIndex++] = value; } + return result; + } - /** - * A fast path for creating `lodash` wrapper objects. - * - * @private - * @param {Mixed} value The value to wrap in a `lodash` instance. - * @returns {Object} Returns a `lodash` instance. - */ - function lodashWrapper(value) { - this.__wrapped__ = value; + // Ensure `LazyWrapper` is an instance of `baseLodash`. + LazyWrapper.prototype = baseCreate(baseLodash.prototype); + LazyWrapper.prototype.constructor = LazyWrapper; + + /*------------------------------------------------------------------------*/ + + /** + * Creates a hash object. + * + * @private + * @constructor + * @param {Array} [entries] The key-value pairs to cache. + */ + function Hash(entries) { + var index = -1, + length = entries == null ? 0 : entries.length; + + this.clear(); + while (++index < length) { + var entry = entries[index]; + this.set(entry[0], entry[1]); } - // ensure `new lodashWrapper` is an instance of `lodash` - lodashWrapper.prototype = lodash.prototype; + } - /** - * An object used to flag environments features. - * - * @static - * @memberOf _ - * @type Object - */ - var support = lodash.support = {}; + /** + * Removes all key-value entries from the hash. + * + * @private + * @name clear + * @memberOf Hash + */ + function hashClear() { + this.__data__ = nativeCreate ? nativeCreate(null) : {}; + this.size = 0; + } - (function() { - var ctor = function() { this.x = 1; }, - object = { '0': 1, 'length': 1 }, - props = []; + /** + * Removes `key` and its value from the hash. + * + * @private + * @name delete + * @memberOf Hash + * @param {Object} hash The hash to modify. + * @param {string} key The key of the value to remove. + * @returns {boolean} Returns `true` if the entry was removed, else `false`. + */ + function hashDelete(key) { + var result = this.has(key) && delete this.__data__[key]; + this.size -= result ? 1 : 0; + return result; + } - ctor.prototype = { 'valueOf': 1, 'y': 1 }; - for (var prop in new ctor) { props.push(prop); } - for (prop in arguments) { } + /** + * Gets the hash value for `key`. + * + * @private + * @name get + * @memberOf Hash + * @param {string} key The key of the value to get. + * @returns {*} Returns the entry value. + */ + function hashGet(key) { + var data = this.__data__; + if (nativeCreate) { + var result = data[key]; + return result === HASH_UNDEFINED ? undefined : result; + } + return hasOwnProperty.call(data, key) ? data[key] : undefined; + } - /** - * Detect if `arguments` objects are `Object` objects (all but Narwhal and Opera < 10.5). - * - * @memberOf _.support - * @type Boolean - */ - support.argsObject = arguments.constructor == Object && !(arguments instanceof Array); + /** + * Checks if a hash value for `key` exists. + * + * @private + * @name has + * @memberOf Hash + * @param {string} key The key of the entry to check. + * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. + */ + function hashHas(key) { + var data = this.__data__; + return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key); + } - /** - * Detect if an `arguments` object's [[Class]] is resolvable (all but Firefox < 4, IE < 9). - * - * @memberOf _.support - * @type Boolean - */ - support.argsClass = isArguments(arguments); + /** + * Sets the hash `key` to `value`. + * + * @private + * @name set + * @memberOf Hash + * @param {string} key The key of the value to set. + * @param {*} value The value to set. + * @returns {Object} Returns the hash instance. + */ + function hashSet(key, value) { + var data = this.__data__; + this.size += this.has(key) ? 0 : 1; + data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value; + return this; + } - /** - * Detect if `name` or `message` properties of `Error.prototype` are - * enumerable by default. (IE < 9, Safari < 5.1) - * - * @memberOf _.support - * @type Boolean - */ - support.enumErrorProps = propertyIsEnumerable.call(errorProto, 'message') || propertyIsEnumerable.call(errorProto, 'name'); + // Add methods to `Hash`. + Hash.prototype.clear = hashClear; + Hash.prototype['delete'] = hashDelete; + Hash.prototype.get = hashGet; + Hash.prototype.has = hashHas; + Hash.prototype.set = hashSet; - /** - * Detect if `prototype` properties are enumerable by default. - * - * Firefox < 3.6, Opera > 9.50 - Opera < 11.60, and Safari < 5.1 - * (if the prototype or a property on the prototype has been set) - * incorrectly sets a function's `prototype` property [[Enumerable]] - * value to `true`. - * - * @memberOf _.support - * @type Boolean - */ - support.enumPrototypes = propertyIsEnumerable.call(ctor, 'prototype'); + /*------------------------------------------------------------------------*/ - /** - * Detect if `Function#bind` exists and is inferred to be fast (all but V8). - * - * @memberOf _.support - * @type Boolean - */ - support.fastBind = nativeBind && !isV8; + /** + * Creates an list cache object. + * + * @private + * @constructor + * @param {Array} [entries] The key-value pairs to cache. + */ + function ListCache(entries) { + var index = -1, + length = entries == null ? 0 : entries.length; - /** - * Detect if own properties are iterated after inherited properties (all but IE < 9). - * - * @memberOf _.support - * @type Boolean - */ - support.ownLast = props[0] != 'x'; + this.clear(); + while (++index < length) { + var entry = entries[index]; + this.set(entry[0], entry[1]); + } + } - /** - * Detect if `arguments` object indexes are non-enumerable - * (Firefox < 4, IE < 9, PhantomJS, Safari < 5.1). - * - * @memberOf _.support - * @type Boolean - */ - support.nonEnumArgs = prop != 0; + /** + * Removes all key-value entries from the list cache. + * + * @private + * @name clear + * @memberOf ListCache + */ + function listCacheClear() { + this.__data__ = []; + this.size = 0; + } - /** - * Detect if properties shadowing those on `Object.prototype` are non-enumerable. - * - * In IE < 9 an objects own properties, shadowing non-enumerable ones, are - * made non-enumerable as well (a.k.a the JScript [[DontEnum]] bug). - * - * @memberOf _.support - * @type Boolean - */ - support.nonEnumShadows = !/valueOf/.test(props); + /** + * Removes `key` and its value from the list cache. + * + * @private + * @name delete + * @memberOf ListCache + * @param {string} key The key of the value to remove. + * @returns {boolean} Returns `true` if the entry was removed, else `false`. + */ + function listCacheDelete(key) { + var data = this.__data__, + index = assocIndexOf(data, key); - /** - * Detect if `Array#shift` and `Array#splice` augment array-like objects correctly. - * - * Firefox < 10, IE compatibility mode, and IE < 9 have buggy Array `shift()` - * and `splice()` functions that fail to remove the last element, `value[0]`, - * of array-like objects even though the `length` property is set to `0`. - * The `shift()` method is buggy in IE 8 compatibility mode, while `splice()` - * is buggy regardless of mode in IE < 9 and buggy in compatibility mode in IE 9. - * - * @memberOf _.support - * @type Boolean - */ - support.spliceObjects = (arrayRef.splice.call(object, 0, 1), !object[0]); + if (index < 0) { + return false; + } + var lastIndex = data.length - 1; + if (index == lastIndex) { + data.pop(); + } else { + splice.call(data, index, 1); + } + --this.size; + return true; + } - /** - * Detect lack of support for accessing string characters by index. - * - * IE < 8 can't access characters by index and IE 8 can only access - * characters by index on string literals. - * - * @memberOf _.support - * @type Boolean - */ - support.unindexedChars = ('x'[0] + Object('x')[0]) != 'xx'; + /** + * Gets the list cache value for `key`. + * + * @private + * @name get + * @memberOf ListCache + * @param {string} key The key of the value to get. + * @returns {*} Returns the entry value. + */ + function listCacheGet(key) { + var data = this.__data__, + index = assocIndexOf(data, key); - /** - * Detect if a DOM node's [[Class]] is resolvable (all but IE < 9) - * and that the JS engine errors when attempting to coerce an object to - * a string without a `toString` function. - * - * @memberOf _.support - * @type Boolean - */ - try { - support.nodeClass = !(toString.call(document) == objectClass && !({ 'toString': 0 } + '')); - } catch(e) { - support.nodeClass = true; - } - }(1)); + return index < 0 ? undefined : data[index][1]; + } - /*--------------------------------------------------------------------------*/ + /** + * Checks if a list cache value for `key` exists. + * + * @private + * @name has + * @memberOf ListCache + * @param {string} key The key of the entry to check. + * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. + */ + function listCacheHas(key) { + return assocIndexOf(this.__data__, key) > -1; + } - /** - * The template used to create iterator functions. - * - * @private - * @param {Object} data The data object used to populate the text. - * @returns {String} Returns the interpolated text. - */ - var iteratorTemplate = function(obj) { + /** + * Sets the list cache `key` to `value`. + * + * @private + * @name set + * @memberOf ListCache + * @param {string} key The key of the value to set. + * @param {*} value The value to set. + * @returns {Object} Returns the list cache instance. + */ + function listCacheSet(key, value) { + var data = this.__data__, + index = assocIndexOf(data, key); - var __p = 'var index, iterable = ' + - (obj.firstArg) + - ', result = ' + - (obj.init) + - ';\nif (!iterable) return result;\n' + - (obj.top) + - ';'; - if (obj.array) { - __p += '\nvar length = iterable.length; index = -1;\nif (' + - (obj.array) + - ') { '; - if (support.unindexedChars) { - __p += '\n if (isString(iterable)) {\n iterable = iterable.split(\'\')\n } '; - } - __p += '\n while (++index < length) {\n ' + - (obj.loop) + - ';\n }\n}\nelse { '; - } else if (support.nonEnumArgs) { - __p += '\n var length = iterable.length; index = -1;\n if (length && isArguments(iterable)) {\n while (++index < length) {\n index += \'\';\n ' + - (obj.loop) + - ';\n }\n } else { '; - } + if (index < 0) { + ++this.size; + data.push([key, value]); + } else { + data[index][1] = value; + } + return this; + } - if (support.enumPrototypes) { - __p += '\n var skipProto = typeof iterable == \'function\';\n '; - } + // Add methods to `ListCache`. + ListCache.prototype.clear = listCacheClear; + ListCache.prototype['delete'] = listCacheDelete; + ListCache.prototype.get = listCacheGet; + ListCache.prototype.has = listCacheHas; + ListCache.prototype.set = listCacheSet; - if (support.enumErrorProps) { - __p += '\n var skipErrorProps = iterable === errorProto || iterable instanceof Error;\n '; - } + /*------------------------------------------------------------------------*/ - var conditions = []; if (support.enumPrototypes) { conditions.push('!(skipProto && index == "prototype")'); } if (support.enumErrorProps) { conditions.push('!(skipErrorProps && (index == "message" || index == "name"))'); } + /** + * Creates a map cache object to store key-value pairs. + * + * @private + * @constructor + * @param {Array} [entries] The key-value pairs to cache. + */ + function MapCache(entries) { + var index = -1, + length = entries == null ? 0 : entries.length; - if (obj.useHas && obj.useKeys) { - __p += '\n var ownIndex = -1,\n ownProps = objectTypes[typeof iterable] && keys(iterable),\n length = ownProps ? ownProps.length : 0;\n\n while (++ownIndex < length) {\n index = ownProps[ownIndex];\n'; - if (conditions.length) { - __p += ' if (' + - (conditions.join(' && ')) + - ') {\n '; - } - __p += - (obj.loop) + - '; '; - if (conditions.length) { - __p += '\n }'; - } - __p += '\n } '; - } else { - __p += '\n for (index in iterable) {\n'; - if (obj.useHas) { conditions.push("hasOwnProperty.call(iterable, index)"); } if (conditions.length) { - __p += ' if (' + - (conditions.join(' && ')) + - ') {\n '; - } - __p += - (obj.loop) + - '; '; - if (conditions.length) { - __p += '\n }'; - } - __p += '\n } '; - if (support.nonEnumShadows) { - __p += '\n\n if (iterable !== objectProto) {\n var ctor = iterable.constructor,\n isProto = iterable === (ctor && ctor.prototype),\n className = iterable === stringProto ? stringClass : iterable === errorProto ? errorClass : toString.call(iterable),\n nonEnum = nonEnumProps[className];\n '; - for (k = 0; k < 7; k++) { - __p += '\n index = \'' + - (obj.shadowedProps[k]) + - '\';\n if ((!(isProto && nonEnum[index]) && hasOwnProperty.call(iterable, index))'; - if (!obj.useHas) { - __p += ' || (!nonEnum[index] && iterable[index] !== objectProto[index])'; - } - __p += ') {\n ' + - (obj.loop) + - ';\n } '; - } - __p += '\n } '; - } + this.clear(); + while (++index < length) { + var entry = entries[index]; + this.set(entry[0], entry[1]); + } + } - } - - if (obj.array || support.nonEnumArgs) { - __p += '\n}'; - } - __p += - (obj.bottom) + - ';\nreturn result'; - - return __p + /** + * Removes all key-value entries from the map. + * + * @private + * @name clear + * @memberOf MapCache + */ + function mapCacheClear() { + this.size = 0; + this.__data__ = { + 'hash': new Hash, + 'map': new (Map || ListCache), + 'string': new Hash }; + } - /** Reusable iterator options for `assign` and `defaults` */ - var defaultsIteratorOptions = { - 'args': 'object, source, guard', - 'top': - 'var args = arguments,\n' + - ' argsIndex = 0,\n' + - " argsLength = typeof guard == 'number' ? 2 : args.length;\n" + - 'while (++argsIndex < argsLength) {\n' + - ' iterable = args[argsIndex];\n' + - ' if (iterable && objectTypes[typeof iterable]) {', - 'loop': "if (typeof result[index] == 'undefined') result[index] = iterable[index]", - 'bottom': ' }\n}' - }; + /** + * Removes `key` and its value from the map. + * + * @private + * @name delete + * @memberOf MapCache + * @param {string} key The key of the value to remove. + * @returns {boolean} Returns `true` if the entry was removed, else `false`. + */ + function mapCacheDelete(key) { + var result = getMapData(this, key)['delete'](key); + this.size -= result ? 1 : 0; + return result; + } - /** Reusable iterator options shared by `each`, `forIn`, and `forOwn` */ - var eachIteratorOptions = { - 'args': 'collection, callback, thisArg', - 'top': "callback = callback && typeof thisArg == 'undefined' ? callback : lodash.createCallback(callback, thisArg)", - 'array': "typeof length == 'number'", - 'loop': 'if (callback(iterable[index], index, collection) === false) return result' - }; + /** + * Gets the map value for `key`. + * + * @private + * @name get + * @memberOf MapCache + * @param {string} key The key of the value to get. + * @returns {*} Returns the entry value. + */ + function mapCacheGet(key) { + return getMapData(this, key).get(key); + } - /** Reusable iterator options for `forIn` and `forOwn` */ - var forOwnIteratorOptions = { - 'top': 'if (!objectTypes[typeof iterable]) return result;\n' + eachIteratorOptions.top, - 'array': false - }; + /** + * Checks if a map value for `key` exists. + * + * @private + * @name has + * @memberOf MapCache + * @param {string} key The key of the entry to check. + * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. + */ + function mapCacheHas(key) { + return getMapData(this, key).has(key); + } - /*--------------------------------------------------------------------------*/ + /** + * Sets the map `key` to `value`. + * + * @private + * @name set + * @memberOf MapCache + * @param {string} key The key of the value to set. + * @param {*} value The value to set. + * @returns {Object} Returns the map cache instance. + */ + function mapCacheSet(key, value) { + var data = getMapData(this, key), + size = data.size; - /** - * Creates a function that, when called, invokes `func` with the `this` binding - * of `thisArg` and prepends any `partialArgs` to the arguments passed to the - * bound function. - * - * @private - * @param {Function|String} func The function to bind or the method name. - * @param {Mixed} [thisArg] The `this` binding of `func`. - * @param {Array} partialArgs An array of arguments to be partially applied. - * @param {Object} [idicator] Used to indicate binding by key or partially - * applying arguments from the right. - * @returns {Function} Returns the new bound function. - */ - function createBound(func, thisArg, partialArgs, indicator) { - var isFunc = isFunction(func), - isPartial = !partialArgs, - key = thisArg; + data.set(key, value); + this.size += data.size == size ? 0 : 1; + return this; + } - // juggle arguments - if (isPartial) { - var rightIndicator = indicator; - partialArgs = thisArg; + // Add methods to `MapCache`. + MapCache.prototype.clear = mapCacheClear; + MapCache.prototype['delete'] = mapCacheDelete; + MapCache.prototype.get = mapCacheGet; + MapCache.prototype.has = mapCacheHas; + MapCache.prototype.set = mapCacheSet; + + /*------------------------------------------------------------------------*/ + + /** + * + * Creates an array cache object to store unique values. + * + * @private + * @constructor + * @param {Array} [values] The values to cache. + */ + function SetCache(values) { + var index = -1, + length = values == null ? 0 : values.length; + + this.__data__ = new MapCache; + while (++index < length) { + this.add(values[index]); + } + } + + /** + * Adds `value` to the array cache. + * + * @private + * @name add + * @memberOf SetCache + * @alias push + * @param {*} value The value to cache. + * @returns {Object} Returns the cache instance. + */ + function setCacheAdd(value) { + this.__data__.set(value, HASH_UNDEFINED); + return this; + } + + /** + * Checks if `value` is in the array cache. + * + * @private + * @name has + * @memberOf SetCache + * @param {*} value The value to search for. + * @returns {number} Returns `true` if `value` is found, else `false`. + */ + function setCacheHas(value) { + return this.__data__.has(value); + } + + // Add methods to `SetCache`. + SetCache.prototype.add = SetCache.prototype.push = setCacheAdd; + SetCache.prototype.has = setCacheHas; + + /*------------------------------------------------------------------------*/ + + /** + * Creates a stack cache object to store key-value pairs. + * + * @private + * @constructor + * @param {Array} [entries] The key-value pairs to cache. + */ + function Stack(entries) { + var data = this.__data__ = new ListCache(entries); + this.size = data.size; + } + + /** + * Removes all key-value entries from the stack. + * + * @private + * @name clear + * @memberOf Stack + */ + function stackClear() { + this.__data__ = new ListCache; + this.size = 0; + } + + /** + * Removes `key` and its value from the stack. + * + * @private + * @name delete + * @memberOf Stack + * @param {string} key The key of the value to remove. + * @returns {boolean} Returns `true` if the entry was removed, else `false`. + */ + function stackDelete(key) { + var data = this.__data__, + result = data['delete'](key); + + this.size = data.size; + return result; + } + + /** + * Gets the stack value for `key`. + * + * @private + * @name get + * @memberOf Stack + * @param {string} key The key of the value to get. + * @returns {*} Returns the entry value. + */ + function stackGet(key) { + return this.__data__.get(key); + } + + /** + * Checks if a stack value for `key` exists. + * + * @private + * @name has + * @memberOf Stack + * @param {string} key The key of the entry to check. + * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. + */ + function stackHas(key) { + return this.__data__.has(key); + } + + /** + * Sets the stack `key` to `value`. + * + * @private + * @name set + * @memberOf Stack + * @param {string} key The key of the value to set. + * @param {*} value The value to set. + * @returns {Object} Returns the stack cache instance. + */ + function stackSet(key, value) { + var data = this.__data__; + if (data instanceof ListCache) { + var pairs = data.__data__; + if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) { + pairs.push([key, value]); + this.size = ++data.size; + return this; } - else if (!isFunc) { - if (!indicator) { - throw new TypeError; - } - thisArg = func; + data = this.__data__ = new MapCache(pairs); + } + data.set(key, value); + this.size = data.size; + return this; + } + + // Add methods to `Stack`. + Stack.prototype.clear = stackClear; + Stack.prototype['delete'] = stackDelete; + Stack.prototype.get = stackGet; + Stack.prototype.has = stackHas; + Stack.prototype.set = stackSet; + + /*------------------------------------------------------------------------*/ + + /** + * Creates an array of the enumerable property names of the array-like `value`. + * + * @private + * @param {*} value The value to query. + * @param {boolean} inherited Specify returning inherited property names. + * @returns {Array} Returns the array of property names. + */ + function arrayLikeKeys(value, inherited) { + var isArr = isArray(value), + isArg = !isArr && isArguments(value), + isBuff = !isArr && !isArg && isBuffer(value), + isType = !isArr && !isArg && !isBuff && isTypedArray(value), + skipIndexes = isArr || isArg || isBuff || isType, + result = skipIndexes ? baseTimes(value.length, String) : [], + length = result.length; + + for (var key in value) { + if ((inherited || hasOwnProperty.call(value, key)) && + !(skipIndexes && ( + // Safari 9 has enumerable `arguments.length` in strict mode. + key == 'length' || + // Node.js 0.10 has enumerable non-index properties on buffers. + (isBuff && (key == 'offset' || key == 'parent')) || + // PhantomJS 2 has enumerable non-index properties on typed arrays. + (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) || + // Skip index properties. + isIndex(key, length) + ))) { + result.push(key); } + } + return result; + } - function bound() { - // `Function#bind` spec - // http://es5.github.com/#x15.3.4.5 - var args = arguments, - thisBinding = isPartial ? this : thisArg; + /** + * This function is like `assignValue` except that it doesn't assign + * `undefined` values. + * + * @private + * @param {Object} object The object to modify. + * @param {string} key The key of the property to assign. + * @param {*} value The value to assign. + */ + function assignMergeValue(object, key, value) { + if ((value !== undefined && !eq(object[key], value)) || + (value === undefined && !(key in object))) { + baseAssignValue(object, key, value); + } + } - if (!isFunc) { - func = thisArg[key]; - } - if (partialArgs.length) { - args = args.length - ? (args = nativeSlice.call(args), rightIndicator ? args.concat(partialArgs) : partialArgs.concat(args)) - : partialArgs; - } - if (this instanceof bound) { - // ensure `new bound` is an instance of `func` - thisBinding = createObject(func.prototype); + /** + * Assigns `value` to `key` of `object` if the existing value is not equivalent + * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * for equality comparisons. + * + * @private + * @param {Object} object The object to modify. + * @param {string} key The key of the property to assign. + * @param {*} value The value to assign. + */ + function assignValue(object, key, value) { + var objValue = object[key]; + if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) || + (value === undefined && !(key in object))) { + baseAssignValue(object, key, value); + } + } - // mimic the constructor's `return` behavior - // http://es5.github.com/#x13.2.2 - var result = func.apply(thisBinding, args); - return isObject(result) ? result : thisBinding; - } - return func.apply(thisBinding, args); + /** + * Gets the index at which the `key` is found in `array` of key-value pairs. + * + * @private + * @param {Array} array The array to inspect. + * @param {*} key The key to search for. + * @returns {number} Returns the index of the matched value, else `-1`. + */ + function assocIndexOf(array, key) { + var length = array.length; + while (length--) { + if (eq(array[length][0], key)) { + return length; } - return bound; } + return -1; + } - /** - * Creates compiled iteration functions. - * - * @private - * @param {Object} [options1, options2, ...] The compile options object(s). - * array - A string of code to determine if the iterable is an array or array-like. - * useHas - A boolean to specify using `hasOwnProperty` checks in the object loop. - * useKeys - A boolean to specify using `_.keys` for own property iteration. - * args - A string of comma separated arguments the iteration function will accept. - * top - A string of code to execute before the iteration branches. - * loop - A string of code to execute in the object loop. - * bottom - A string of code to execute after the iteration branches. - * @returns {Function} Returns the compiled function. - */ - function createIterator() { - var data = getObject(); + /** + * The base implementation of `_.assign` without support for multiple sources + * or `customizer` functions. + * + * @private + * @param {Object} object The destination object. + * @param {Object} source The source object. + * @returns {Object} Returns `object`. + */ + function baseAssign(object, source) { + return object && copyObject(source, keys(source), object); + } - // data properties - data.shadowedProps = shadowedProps; - // iterator options - data.array = data.bottom = data.loop = data.top = ''; - data.init = 'iterable'; - data.useHas = true; - data.useKeys = !!keys; + /** + * The base implementation of `_.assignIn` without support for multiple sources + * or `customizer` functions. + * + * @private + * @param {Object} object The destination object. + * @param {Object} source The source object. + * @returns {Object} Returns `object`. + */ + function baseAssignIn(object, source) { + return object && copyObject(source, keysIn(source), object); + } - // merge options into a template data object - for (var object, index = 0; object = arguments[index]; index++) { - for (var key in object) { - data[key] = object[key]; - } + /** + * The base implementation of `assignValue` and `assignMergeValue` without + * value checks. + * + * @private + * @param {Object} object The object to modify. + * @param {string} key The key of the property to assign. + * @param {*} value The value to assign. + */ + function baseAssignValue(object, key, value) { + if (key == '__proto__' && defineProperty) { + defineProperty(object, key, { + 'configurable': true, + 'enumerable': true, + 'value': value, + 'writable': true + }); + } else { + object[key] = value; + } + } + + /** + * The base implementation of `_.at` without support for individual paths. + * + * @private + * @param {Object} object The object to iterate over. + * @param {string[]} paths The property paths to pick. + * @returns {Array} Returns the picked elements. + */ + function baseAt(object, paths) { + var index = -1, + length = paths.length, + result = Array(length), + skip = object == null; + + while (++index < length) { + result[index] = skip ? undefined : get(object, paths[index]); + } + return result; + } + + /** + * The base implementation of `_.clone` and `_.cloneDeep` which tracks + * traversed objects. + * + * @private + * @param {*} value The value to clone. + * @param {boolean} bitmask The bitmask flags. + * 1 - Deep clone + * 2 - Flatten inherited properties + * 4 - Clone symbols + * @param {Function} [customizer] The function to customize cloning. + * @param {string} [key] The key of `value`. + * @param {Object} [object] The parent object of `value`. + * @param {Object} [stack] Tracks traversed objects and their clone counterparts. + * @returns {*} Returns the cloned value. + */ + function baseClone(value, bitmask, customizer, key, object, stack) { + var result, + isDeep = bitmask & CLONE_DEEP_FLAG, + isFlat = bitmask & CLONE_FLAT_FLAG, + isFull = bitmask & CLONE_SYMBOLS_FLAG; + + if (customizer) { + result = object ? customizer(value, key, object, stack) : customizer(value); + } + if (result !== undefined) { + return result; + } + if (!isObject(value)) { + return value; + } + var isArr = isArray(value); + if (isArr) { + result = initCloneArray(value); + if (!isDeep) { + return copyArray(value, result); } - var args = data.args; - data.firstArg = /^[^,]+/.exec(args)[0]; + } else { + var tag = getTag(value), + isFunc = tag == funcTag || tag == genTag; - // create the function factory - var factory = Function( - 'errorClass, errorProto, hasOwnProperty, isArguments, isArray, ' + - 'isString, keys, lodash, objectProto, objectTypes, nonEnumProps, ' + - 'stringClass, stringProto, toString', - 'return function(' + args + ') {\n' + iteratorTemplate(data) + '\n}' - ); - - releaseObject(data); - - // return the compiled function - return factory( - errorClass, errorProto, hasOwnProperty, isArguments, isArray, - isString, keys, lodash, objectProto, objectTypes, nonEnumProps, - stringClass, stringProto, toString - ); - } - - /** - * Creates a new object with the specified `prototype`. - * - * @private - * @param {Object} prototype The prototype object. - * @returns {Object} Returns the new object. - */ - function createObject(prototype) { - return isObject(prototype) ? nativeCreate(prototype) : {}; - } - // fallback for browsers without `Object.create` - if (!nativeCreate) { - var createObject = function(prototype) { - if (isObject(prototype)) { - noop.prototype = prototype; - var result = new noop; - noop.prototype = null; + if (isBuffer(value)) { + return cloneBuffer(value, isDeep); + } + if (tag == objectTag || tag == argsTag || (isFunc && !object)) { + result = (isFlat || isFunc) ? {} : initCloneObject(value); + if (!isDeep) { + return isFlat + ? copySymbolsIn(value, baseAssignIn(result, value)) + : copySymbols(value, baseAssign(result, value)); } - return result || {}; - }; + } else { + if (!cloneableTags[tag]) { + return object ? value : {}; + } + result = initCloneByTag(value, tag, isDeep); + } } - - /** - * Used by `escape` to convert characters to HTML entities. - * - * @private - * @param {String} match The matched character to escape. - * @returns {String} Returns the escaped character. - */ - function escapeHtmlChar(match) { - return htmlEscapes[match]; + // Check for circular references and return its corresponding clone. + stack || (stack = new Stack); + var stacked = stack.get(value); + if (stacked) { + return stacked; } + stack.set(value, result); + + if (isSet(value)) { + value.forEach(function(subValue) { + result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack)); + }); - /** - * Gets the appropriate "indexOf" function. If the `_.indexOf` method is - * customized, this method returns the custom method, otherwise it returns - * the `basicIndexOf` function. - * - * @private - * @returns {Function} Returns the "indexOf" function. - */ - function getIndexOf(array, value, fromIndex) { - var result = (result = lodash.indexOf) === indexOf ? basicIndexOf : result; return result; } - /** - * Creates a function that juggles arguments, allowing argument overloading - * for `_.flatten` and `_.uniq`, before passing them to the given `func`. - * - * @private - * @param {Function} func The function to wrap. - * @returns {Function} Returns the new function. - */ - function overloadWrapper(func) { - return function(array, flag, callback, thisArg) { - // juggle arguments - if (typeof flag != 'boolean' && flag != null) { - thisArg = callback; - callback = !(thisArg && thisArg[flag] === array) ? flag : undefined; - flag = false; - } - if (callback != null) { - callback = lodash.createCallback(callback, thisArg); - } - return func(array, flag, callback, thisArg); - }; + if (isMap(value)) { + value.forEach(function(subValue, key) { + result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack)); + }); + + return result; } - /** - * A fallback implementation of `isPlainObject` which checks if a given `value` - * is an object created by the `Object` constructor, assuming objects created - * by the `Object` constructor have no inherited enumerable properties and that - * there are no `Object.prototype` extensions. - * - * @private - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`. - */ - function shimIsPlainObject(value) { - var ctor, - result; + var keysFunc = isFull + ? (isFlat ? getAllKeysIn : getAllKeys) + : (isFlat ? keysIn : keys); - // avoid non Object objects, `arguments` objects, and DOM elements - if (!(value && toString.call(value) == objectClass) || - (ctor = value.constructor, isFunction(ctor) && !(ctor instanceof ctor)) || - (!support.argsClass && isArguments(value)) || - (!support.nodeClass && isNode(value))) { + var props = isArr ? undefined : keysFunc(value); + arrayEach(props || value, function(subValue, key) { + if (props) { + key = subValue; + subValue = value[key]; + } + // Recursively populate clone (susceptible to call stack limits). + assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack)); + }); + return result; + } + + /** + * The base implementation of `_.delay` and `_.defer` which accepts `args` + * to provide to `func`. + * + * @private + * @param {Function} func The function to delay. + * @param {number} wait The number of milliseconds to delay invocation. + * @param {Array} args The arguments to provide to `func`. + * @returns {number|Object} Returns the timer id or timeout object. + */ + function baseDelay(func, wait, args) { + if (typeof func != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + return setTimeout(function() { func.apply(undefined, args); }, wait); + } + + /** + * The base implementation of methods like `_.difference` without support + * for excluding multiple arrays or iteratee shorthands. + * + * @private + * @param {Array} array The array to inspect. + * @param {Array} values The values to exclude. + * @param {Function} [iteratee] The iteratee invoked per element. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns the new array of filtered values. + */ + function baseDifference(array, values, iteratee, comparator) { + var index = -1, + includes = arrayIncludes, + isCommon = true, + length = array.length, + result = [], + valuesLength = values.length; + + if (!length) { + return result; + } + if (iteratee) { + values = arrayMap(values, baseUnary(iteratee)); + } + if (comparator) { + includes = arrayIncludesWith; + isCommon = false; + } + else if (values.length >= LARGE_ARRAY_SIZE) { + includes = cacheHas; + isCommon = false; + values = new SetCache(values); + } + outer: + while (++index < length) { + var value = array[index], + computed = iteratee == null ? value : iteratee(value); + + value = (comparator || value !== 0) ? value : 0; + if (isCommon && computed === computed) { + var valuesIndex = valuesLength; + while (valuesIndex--) { + if (values[valuesIndex] === computed) { + continue outer; + } + } + result.push(value); + } + else if (!includes(values, computed, comparator)) { + result.push(value); + } + } + return result; + } + + /** + * The base implementation of `_.forEach` without support for iteratee shorthands. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Array|Object} Returns `collection`. + */ + var baseEach = createBaseEach(baseForOwn); + + /** + * The base implementation of `_.every` without support for iteratee shorthands. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} predicate The function invoked per iteration. + * @returns {boolean} Returns `true` if all elements pass the predicate check, + * else `false` + */ + function baseEvery(collection, predicate) { + var result = true; + baseEach(collection, function(value, index, collection) { + result = !!predicate(value, index, collection); + return result; + }); + return result; + } + + /** + * The base implementation of methods like `_.max` and `_.min` which accepts a + * `comparator` to determine the extremum value. + * + * @private + * @param {Array} array The array to iterate over. + * @param {Function} iteratee The iteratee invoked per iteration. + * @param {Function} comparator The comparator used to compare values. + * @returns {*} Returns the extremum value. + */ + function baseExtremum(array, iteratee, comparator) { + var index = -1, + length = array.length; + + while (++index < length) { + var value = array[index], + current = iteratee(value); + + if (current != null && (computed === undefined + ? (current === current && !isSymbol(current)) + : comparator(current, computed) + )) { + var computed = current, + result = value; + } + } + return result; + } + + /** + * The base implementation of `_.filter` without support for iteratee shorthands. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} predicate The function invoked per iteration. + * @returns {Array} Returns the new filtered array. + */ + function baseFilter(collection, predicate) { + var result = []; + baseEach(collection, function(value, index, collection) { + if (predicate(value, index, collection)) { + result.push(value); + } + }); + return result; + } + + /** + * The base implementation of `_.flatten` with support for restricting flattening. + * + * @private + * @param {Array} array The array to flatten. + * @param {number} depth The maximum recursion depth. + * @param {boolean} [predicate=isFlattenable] The function invoked per iteration. + * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks. + * @param {Array} [result=[]] The initial result value. + * @returns {Array} Returns the new flattened array. + */ + function baseFlatten(array, depth, predicate, isStrict, result) { + var index = -1, + length = array.length; + + predicate || (predicate = isFlattenable); + result || (result = []); + + while (++index < length) { + var value = array[index]; + if (depth > 0 && predicate(value)) { + if (depth > 1) { + // Recursively flatten arrays (susceptible to call stack limits). + baseFlatten(value, depth - 1, predicate, isStrict, result); + } else { + arrayPush(result, value); + } + } else if (!isStrict) { + result[result.length] = value; + } + } + return result; + } + + /** + * The base implementation of `baseForOwn` which iterates over `object` + * properties returned by `keysFunc` and invokes `iteratee` for each property. + * Iteratee functions may exit iteration early by explicitly returning `false`. + * + * @private + * @param {Object} object The object to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @param {Function} keysFunc The function to get the keys of `object`. + * @returns {Object} Returns `object`. + */ + var baseFor = createBaseFor(); + + /** + * The base implementation of `_.forOwn` without support for iteratee shorthands. + * + * @private + * @param {Object} object The object to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Object} Returns `object`. + */ + function baseForOwn(object, iteratee) { + return object && baseFor(object, iteratee, keys); + } + + /** + * The base implementation of `_.functions` which creates an array of + * `object` function property names filtered from `props`. + * + * @private + * @param {Object} object The object to inspect. + * @param {Array} props The property names to filter. + * @returns {Array} Returns the function names. + */ + function baseFunctions(object, props) { + return arrayFilter(props, function(key) { + return isFunction(object[key]); + }); + } + + /** + * The base implementation of `_.get` without support for default values. + * + * @private + * @param {Object} object The object to query. + * @param {Array|string} path The path of the property to get. + * @returns {*} Returns the resolved value. + */ + function baseGet(object, path) { + path = castPath(path, object); + + var index = 0, + length = path.length; + + while (object != null && index < length) { + object = object[toKey(path[index++])]; + } + return (index && index == length) ? object : undefined; + } + + /** + * The base implementation of `getAllKeys` and `getAllKeysIn` which uses + * `keysFunc` and `symbolsFunc` to get the enumerable property names and + * symbols of `object`. + * + * @private + * @param {Object} object The object to query. + * @param {Function} keysFunc The function to get the keys of `object`. + * @param {Function} symbolsFunc The function to get the symbols of `object`. + * @returns {Array} Returns the array of property names and symbols. + */ + function baseGetAllKeys(object, keysFunc, symbolsFunc) { + var result = keysFunc(object); + return isArray(object) ? result : arrayPush(result, symbolsFunc(object)); + } + + /** + * The base implementation of `getTag` without fallbacks for buggy environments. + * + * @private + * @param {*} value The value to query. + * @returns {string} Returns the `toStringTag`. + */ + function baseGetTag(value) { + if (value == null) { + return value === undefined ? undefinedTag : nullTag; + } + return (symToStringTag && symToStringTag in Object(value)) + ? getRawTag(value) + : objectToString(value); + } + + /** + * The base implementation of `_.gt` which doesn't coerce arguments. + * + * @private + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if `value` is greater than `other`, + * else `false`. + */ + function baseGt(value, other) { + return value > other; + } + + /** + * The base implementation of `_.hasIn` without support for deep paths. + * + * @private + * @param {Object} [object] The object to query. + * @param {Array|string} key The key to check. + * @returns {boolean} Returns `true` if `key` exists, else `false`. + */ + function baseHasIn(object, key) { + return object != null && key in Object(object); + } + + /** + * The base implementation of methods like `_.intersection`, without support + * for iteratee shorthands, that accepts an array of arrays to inspect. + * + * @private + * @param {Array} arrays The arrays to inspect. + * @param {Function} [iteratee] The iteratee invoked per element. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns the new array of shared values. + */ + function baseIntersection(arrays, iteratee, comparator) { + var includes = comparator ? arrayIncludesWith : arrayIncludes, + length = arrays[0].length, + othLength = arrays.length, + othIndex = othLength, + caches = Array(othLength), + maxLength = Infinity, + result = []; + + while (othIndex--) { + var array = arrays[othIndex]; + if (othIndex && iteratee) { + array = arrayMap(array, baseUnary(iteratee)); + } + maxLength = nativeMin(array.length, maxLength); + caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120)) + ? new SetCache(othIndex && array) + : undefined; + } + array = arrays[0]; + + var index = -1, + seen = caches[0]; + + outer: + while (++index < length && result.length < maxLength) { + var value = array[index], + computed = iteratee ? iteratee(value) : value; + + value = (comparator || value !== 0) ? value : 0; + if (!(seen + ? cacheHas(seen, computed) + : includes(result, computed, comparator) + )) { + othIndex = othLength; + while (--othIndex) { + var cache = caches[othIndex]; + if (!(cache + ? cacheHas(cache, computed) + : includes(arrays[othIndex], computed, comparator)) + ) { + continue outer; + } + } + if (seen) { + seen.push(computed); + } + result.push(value); + } + } + return result; + } + + /** + * The base implementation of `_.invoke` without support for individual + * method arguments. + * + * @private + * @param {Object} object The object to query. + * @param {Array|string} path The path of the method to invoke. + * @param {Array} args The arguments to invoke the method with. + * @returns {*} Returns the result of the invoked method. + */ + function baseInvoke(object, path, args) { + path = castPath(path, object); + object = parent(object, path); + var func = object == null ? object : object[toKey(last(path))]; + return func == null ? undefined : apply(func, object, args); + } + + /** + * The base implementation of `_.isArguments`. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an `arguments` object, + */ + function baseIsArguments(value) { + return isObjectLike(value) && baseGetTag(value) == argsTag; + } + + /** + * The base implementation of `_.isEqual` which supports partial comparisons + * and tracks traversed objects. + * + * @private + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @param {boolean} bitmask The bitmask flags. + * 1 - Unordered comparison + * 2 - Partial comparison + * @param {Function} [customizer] The function to customize comparisons. + * @param {Object} [stack] Tracks traversed `value` and `other` objects. + * @returns {boolean} Returns `true` if the values are equivalent, else `false`. + */ + function baseIsEqual(value, other, bitmask, customizer, stack) { + if (value === other) { + return true; + } + if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) { + return value !== value && other !== other; + } + return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack); + } + + /** + * A specialized version of `baseIsEqual` for arrays and objects which performs + * deep comparisons and tracks traversed objects enabling objects with circular + * references to be compared. + * + * @private + * @param {Object} object The object to compare. + * @param {Object} other The other object to compare. + * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details. + * @param {Function} customizer The function to customize comparisons. + * @param {Function} equalFunc The function to determine equivalents of values. + * @param {Object} [stack] Tracks traversed `object` and `other` objects. + * @returns {boolean} Returns `true` if the objects are equivalent, else `false`. + */ + function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) { + var objIsArr = isArray(object), + othIsArr = isArray(other), + objTag = objIsArr ? arrayTag : getTag(object), + othTag = othIsArr ? arrayTag : getTag(other); + + objTag = objTag == argsTag ? objectTag : objTag; + othTag = othTag == argsTag ? objectTag : othTag; + + var objIsObj = objTag == objectTag, + othIsObj = othTag == objectTag, + isSameTag = objTag == othTag; + + if (isSameTag && isBuffer(object)) { + if (!isBuffer(other)) { return false; } - // IE < 9 iterates inherited properties before own properties. If the first - // iterated property is an object's own property then there are no inherited - // enumerable properties. - if (support.ownLast) { - forIn(value, function(value, key, object) { - result = hasOwnProperty.call(object, key); - return false; - }); - return result !== false; - } - // In most environments an object's own properties are iterated before - // its inherited properties. If the last iterated property is an object's - // own property then there are no inherited enumerable properties. - forIn(value, function(value, key) { - result = key; - }); - return result === undefined || hasOwnProperty.call(value, result); + objIsArr = true; + objIsObj = false; } - - /** - * Used by `unescape` to convert HTML entities to characters. - * - * @private - * @param {String} match The matched character to unescape. - * @returns {String} Returns the unescaped character. - */ - function unescapeHtmlChar(match) { - return htmlUnescapes[match]; + if (isSameTag && !objIsObj) { + stack || (stack = new Stack); + return (objIsArr || isTypedArray(object)) + ? equalArrays(object, other, bitmask, customizer, equalFunc, stack) + : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack); } + if (!(bitmask & COMPARE_PARTIAL_FLAG)) { + var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'), + othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__'); - /*--------------------------------------------------------------------------*/ + if (objIsWrapped || othIsWrapped) { + var objUnwrapped = objIsWrapped ? object.value() : object, + othUnwrapped = othIsWrapped ? other.value() : other; - /** - * Checks if `value` is an `arguments` object. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is an `arguments` object, else `false`. - * @example - * - * (function() { return _.isArguments(arguments); })(1, 2, 3); - * // => true - * - * _.isArguments([1, 2, 3]); - * // => false - */ - function isArguments(value) { - return toString.call(value) == argsClass; + stack || (stack = new Stack); + return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack); + } } - // fallback for browsers that can't detect `arguments` objects by [[Class]] - if (!support.argsClass) { - isArguments = function(value) { - return value ? hasOwnProperty.call(value, 'callee') : false; - }; + if (!isSameTag) { + return false; } + stack || (stack = new Stack); + return equalObjects(object, other, bitmask, customizer, equalFunc, stack); + } - /** - * Checks if `value` is an array. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is an array, else `false`. - * @example - * - * (function() { return _.isArray(arguments); })(); - * // => false - * - * _.isArray([1, 2, 3]); - * // => true - */ - var isArray = nativeIsArray || function(value) { - return value ? (typeof value == 'object' && toString.call(value) == arrayClass) : false; - }; + /** + * The base implementation of `_.isMap` without Node.js optimizations. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a map, else `false`. + */ + function baseIsMap(value) { + return isObjectLike(value) && getTag(value) == mapTag; + } - /** - * A fallback implementation of `Object.keys` which produces an array of the - * given object's own enumerable property names. - * - * @private - * @type Function - * @param {Object} object The object to inspect. - * @returns {Array} Returns a new array of property names. - */ - var shimKeys = createIterator({ - 'args': 'object', - 'init': '[]', - 'top': 'if (!(objectTypes[typeof object])) return result', - 'loop': 'result.push(index)' - }); + /** + * The base implementation of `_.isMatch` without support for iteratee shorthands. + * + * @private + * @param {Object} object The object to inspect. + * @param {Object} source The object of property values to match. + * @param {Array} matchData The property names, values, and compare flags to match. + * @param {Function} [customizer] The function to customize comparisons. + * @returns {boolean} Returns `true` if `object` is a match, else `false`. + */ + function baseIsMatch(object, source, matchData, customizer) { + var index = matchData.length, + length = index, + noCustomizer = !customizer; - /** - * Creates an array composed of the own enumerable property names of `object`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The object to inspect. - * @returns {Array} Returns a new array of property names. - * @example - * - * _.keys({ 'one': 1, 'two': 2, 'three': 3 }); - * // => ['one', 'two', 'three'] (order is not guaranteed) - */ - var keys = !nativeKeys ? shimKeys : function(object) { - if (!isObject(object)) { - return []; - } - if ((support.enumPrototypes && typeof object == 'function') || - (support.nonEnumArgs && object.length && isArguments(object))) { - return shimKeys(object); - } - return nativeKeys(object); - }; - - /** - * A function compiled to iterate `arguments` objects, arrays, objects, and - * strings consistenly across environments, executing the `callback` for each - * element in the `collection`. The `callback` is bound to `thisArg` and invoked - * with three arguments; (value, index|key, collection). Callbacks may exit - * iteration early by explicitly returning `false`. - * - * @private - * @type Function - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array|Object|String} Returns `collection`. - */ - var basicEach = createIterator(eachIteratorOptions); - - /** - * Used to convert characters to HTML entities: - * - * Though the `>` character is escaped for symmetry, characters like `>` and `/` - * don't require escaping in HTML and have no special meaning unless they're part - * of a tag or an unquoted attribute value. - * http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact") - */ - var htmlEscapes = { - '&': '&', - '<': '<', - '>': '>', - '"': '"', - "'": ''' - }; - - /** Used to convert HTML entities to characters */ - var htmlUnescapes = invert(htmlEscapes); - - /*--------------------------------------------------------------------------*/ - - /** - * Assigns own enumerable properties of source object(s) to the destination - * object. Subsequent sources will overwrite property assignments of previous - * sources. If a `callback` function is passed, it will be executed to produce - * the assigned values. The `callback` is bound to `thisArg` and invoked with - * two arguments; (objectValue, sourceValue). - * - * @static - * @memberOf _ - * @type Function - * @alias extend - * @category Objects - * @param {Object} object The destination object. - * @param {Object} [source1, source2, ...] The source objects. - * @param {Function} [callback] The function to customize assigning values. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Object} Returns the destination object. - * @example - * - * _.assign({ 'name': 'moe' }, { 'age': 40 }); - * // => { 'name': 'moe', 'age': 40 } - * - * var defaults = _.partialRight(_.assign, function(a, b) { - * return typeof a == 'undefined' ? b : a; - * }); - * - * var food = { 'name': 'apple' }; - * defaults(food, { 'name': 'banana', 'type': 'fruit' }); - * // => { 'name': 'apple', 'type': 'fruit' } - */ - var assign = createIterator(defaultsIteratorOptions, { - 'top': - defaultsIteratorOptions.top.replace(';', - ';\n' + - "if (argsLength > 3 && typeof args[argsLength - 2] == 'function') {\n" + - ' var callback = lodash.createCallback(args[--argsLength - 1], args[argsLength--], 2);\n' + - "} else if (argsLength > 2 && typeof args[argsLength - 1] == 'function') {\n" + - ' callback = args[--argsLength];\n' + - '}' - ), - 'loop': 'result[index] = callback ? callback(result[index], iterable[index]) : iterable[index]' - }); - - /** - * Creates a clone of `value`. If `deep` is `true`, nested objects will also - * be cloned, otherwise they will be assigned by reference. If a `callback` - * function is passed, it will be executed to produce the cloned values. If - * `callback` returns `undefined`, cloning will be handled by the method instead. - * The `callback` is bound to `thisArg` and invoked with one argument; (value). - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to clone. - * @param {Boolean} [deep=false] A flag to indicate a deep clone. - * @param {Function} [callback] The function to customize cloning values. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @param- {Array} [stackA=[]] Tracks traversed source objects. - * @param- {Array} [stackB=[]] Associates clones with source counterparts. - * @returns {Mixed} Returns the cloned `value`. - * @example - * - * var stooges = [ - * { 'name': 'moe', 'age': 40 }, - * { 'name': 'larry', 'age': 50 } - * ]; - * - * var shallow = _.clone(stooges); - * shallow[0] === stooges[0]; - * // => true - * - * var deep = _.clone(stooges, true); - * deep[0] === stooges[0]; - * // => false - * - * _.mixin({ - * 'clone': _.partialRight(_.clone, function(value) { - * return _.isElement(value) ? value.cloneNode(false) : undefined; - * }) - * }); - * - * var clone = _.clone(document.body); - * clone.childNodes.length; - * // => 0 - */ - function clone(value, deep, callback, thisArg, stackA, stackB) { - var result = value; - - // allows working with "Collections" methods without using their `callback` - // argument, `index|key`, for this method's `callback` - if (typeof deep != 'boolean' && deep != null) { - thisArg = callback; - callback = deep; - deep = false; - } - if (typeof callback == 'function') { - callback = (typeof thisArg == 'undefined') - ? callback - : lodash.createCallback(callback, thisArg, 1); - - result = callback(result); - if (typeof result != 'undefined') { - return result; - } - result = value; - } - // inspect [[Class]] - var isObj = isObject(result); - if (isObj) { - var className = toString.call(result); - if (!cloneableClasses[className] || (!support.nodeClass && isNode(result))) { - return result; - } - var isArr = isArray(result); - } - // shallow clone - if (!isObj || !deep) { - return isObj - ? (isArr ? slice(result) : assign({}, result)) - : result; - } - var ctor = ctorByClass[className]; - switch (className) { - case boolClass: - case dateClass: - return new ctor(+result); - - case numberClass: - case stringClass: - return new ctor(result); - - case regexpClass: - return ctor(result.source, reFlags.exec(result)); - } - // check for circular references and return corresponding clone - var initedStack = !stackA; - stackA || (stackA = getArray()); - stackB || (stackB = getArray()); - - var length = stackA.length; - while (length--) { - if (stackA[length] == value) { - return stackB[length]; - } - } - // init cloned object - result = isArr ? ctor(result.length) : {}; - - // add array properties assigned by `RegExp#exec` - if (isArr) { - if (hasOwnProperty.call(value, 'index')) { - result.index = value.index; - } - if (hasOwnProperty.call(value, 'input')) { - result.input = value.input; - } - } - // add the source value to the stack of traversed objects - // and associate it with its clone - stackA.push(value); - stackB.push(result); - - // recursively populate clone (susceptible to call stack limits) - (isArr ? basicEach : forOwn)(value, function(objValue, key) { - result[key] = clone(objValue, deep, callback, undefined, stackA, stackB); - }); - - if (initedStack) { - releaseArray(stackA); - releaseArray(stackB); - } - return result; + if (object == null) { + return !length; } - - /** - * Creates a deep clone of `value`. If a `callback` function is passed, - * it will be executed to produce the cloned values. If `callback` returns - * `undefined`, cloning will be handled by the method instead. The `callback` - * is bound to `thisArg` and invoked with one argument; (value). - * - * Note: This method is loosely based on the structured clone algorithm. Functions - * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and - * objects created by constructors other than `Object` are cloned to plain `Object` objects. - * See http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to deep clone. - * @param {Function} [callback] The function to customize cloning values. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the deep cloned `value`. - * @example - * - * var stooges = [ - * { 'name': 'moe', 'age': 40 }, - * { 'name': 'larry', 'age': 50 } - * ]; - * - * var deep = _.cloneDeep(stooges); - * deep[0] === stooges[0]; - * // => false - * - * var view = { - * 'label': 'docs', - * 'node': element - * }; - * - * var clone = _.cloneDeep(view, function(value) { - * return _.isElement(value) ? value.cloneNode(true) : undefined; - * }); - * - * clone.node == view.node; - * // => false - */ - function cloneDeep(value, callback, thisArg) { - return clone(value, true, callback, thisArg); - } - - /** - * Assigns own enumerable properties of source object(s) to the destination - * object for all destination properties that resolve to `undefined`. Once a - * property is set, additional defaults of the same property will be ignored. - * - * @static - * @memberOf _ - * @type Function - * @category Objects - * @param {Object} object The destination object. - * @param {Object} [source1, source2, ...] The source objects. - * @param- {Object} [guard] Allows working with `_.reduce` without using its - * callback's `key` and `object` arguments as sources. - * @returns {Object} Returns the destination object. - * @example - * - * var food = { 'name': 'apple' }; - * _.defaults(food, { 'name': 'banana', 'type': 'fruit' }); - * // => { 'name': 'apple', 'type': 'fruit' } - */ - var defaults = createIterator(defaultsIteratorOptions); - - /** - * This method is similar to `_.find`, except that it returns the key of the - * element that passes the callback check, instead of the element itself. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The object to search. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the key of the found element, else `undefined`. - * @example - * - * _.findKey({ 'a': 1, 'b': 2, 'c': 3, 'd': 4 }, function(num) { - * return num % 2 == 0; - * }); - * // => 'b' - */ - function findKey(object, callback, thisArg) { - var result; - callback = lodash.createCallback(callback, thisArg); - forOwn(object, function(value, key, object) { - if (callback(value, key, object)) { - result = key; - return false; - } - }); - return result; - } - - /** - * Iterates over `object`'s own and inherited enumerable properties, executing - * the `callback` for each property. The `callback` is bound to `thisArg` and - * invoked with three arguments; (value, key, object). Callbacks may exit iteration - * early by explicitly returning `false`. - * - * @static - * @memberOf _ - * @type Function - * @category Objects - * @param {Object} object The object to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Object} Returns `object`. - * @example - * - * function Dog(name) { - * this.name = name; - * } - * - * Dog.prototype.bark = function() { - * alert('Woof, woof!'); - * }; - * - * _.forIn(new Dog('Dagny'), function(value, key) { - * alert(key); - * }); - * // => alerts 'name' and 'bark' (order is not guaranteed) - */ - var forIn = createIterator(eachIteratorOptions, forOwnIteratorOptions, { - 'useHas': false - }); - - /** - * Iterates over an object's own enumerable properties, executing the `callback` - * for each property. The `callback` is bound to `thisArg` and invoked with three - * arguments; (value, key, object). Callbacks may exit iteration early by explicitly - * returning `false`. - * - * @static - * @memberOf _ - * @type Function - * @category Objects - * @param {Object} object The object to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Object} Returns `object`. - * @example - * - * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) { - * alert(key); - * }); - * // => alerts '0', '1', and 'length' (order is not guaranteed) - */ - var forOwn = createIterator(eachIteratorOptions, forOwnIteratorOptions); - - /** - * Creates a sorted array of all enumerable properties, own and inherited, - * of `object` that have function values. - * - * @static - * @memberOf _ - * @alias methods - * @category Objects - * @param {Object} object The object to inspect. - * @returns {Array} Returns a new array of property names that have function values. - * @example - * - * _.functions(_); - * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...] - */ - function functions(object) { - var result = []; - forIn(object, function(value, key) { - if (isFunction(value)) { - result.push(key); - } - }); - return result.sort(); - } - - /** - * Checks if the specified object `property` exists and is a direct property, - * instead of an inherited property. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The object to check. - * @param {String} property The property to check for. - * @returns {Boolean} Returns `true` if key is a direct property, else `false`. - * @example - * - * _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b'); - * // => true - */ - function has(object, property) { - return object ? hasOwnProperty.call(object, property) : false; - } - - /** - * Creates an object composed of the inverted keys and values of the given `object`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The object to invert. - * @returns {Object} Returns the created inverted object. - * @example - * - * _.invert({ 'first': 'moe', 'second': 'larry' }); - * // => { 'moe': 'first', 'larry': 'second' } - */ - function invert(object) { - var index = -1, - props = keys(object), - length = props.length, - result = {}; - - while (++index < length) { - var key = props[index]; - result[object[key]] = key; - } - return result; - } - - /** - * Checks if `value` is a boolean value. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is a boolean value, else `false`. - * @example - * - * _.isBoolean(null); - * // => false - */ - function isBoolean(value) { - return value === true || value === false || toString.call(value) == boolClass; - } - - /** - * Checks if `value` is a date. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is a date, else `false`. - * @example - * - * _.isDate(new Date); - * // => true - */ - function isDate(value) { - return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false; - } - - /** - * Checks if `value` is a DOM element. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is a DOM element, else `false`. - * @example - * - * _.isElement(document.body); - * // => true - */ - function isElement(value) { - return value ? value.nodeType === 1 : false; - } - - /** - * Checks if `value` is empty. Arrays, strings, or `arguments` objects with a - * length of `0` and objects with no own enumerable properties are considered - * "empty". - * - * @static - * @memberOf _ - * @category Objects - * @param {Array|Object|String} value The value to inspect. - * @returns {Boolean} Returns `true`, if the `value` is empty, else `false`. - * @example - * - * _.isEmpty([1, 2, 3]); - * // => false - * - * _.isEmpty({}); - * // => true - * - * _.isEmpty(''); - * // => true - */ - function isEmpty(value) { - var result = true; - if (!value) { - return result; - } - var className = toString.call(value), - length = value.length; - - if ((className == arrayClass || className == stringClass || - (support.argsClass ? className == argsClass : isArguments(value))) || - (className == objectClass && typeof length == 'number' && isFunction(value.splice))) { - return !length; - } - forOwn(value, function() { - return (result = false); - }); - return result; - } - - /** - * Performs a deep comparison between two values to determine if they are - * equivalent to each other. If `callback` is passed, it will be executed to - * compare values. If `callback` returns `undefined`, comparisons will be handled - * by the method instead. The `callback` is bound to `thisArg` and invoked with - * two arguments; (a, b). - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} a The value to compare. - * @param {Mixed} b The other value to compare. - * @param {Function} [callback] The function to customize comparing values. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @param- {Array} [stackA=[]] Tracks traversed `a` objects. - * @param- {Array} [stackB=[]] Tracks traversed `b` objects. - * @returns {Boolean} Returns `true`, if the values are equivalent, else `false`. - * @example - * - * var moe = { 'name': 'moe', 'age': 40 }; - * var copy = { 'name': 'moe', 'age': 40 }; - * - * moe == copy; - * // => false - * - * _.isEqual(moe, copy); - * // => true - * - * var words = ['hello', 'goodbye']; - * var otherWords = ['hi', 'goodbye']; - * - * _.isEqual(words, otherWords, function(a, b) { - * var reGreet = /^(?:hello|hi)$/i, - * aGreet = _.isString(a) && reGreet.test(a), - * bGreet = _.isString(b) && reGreet.test(b); - * - * return (aGreet || bGreet) ? (aGreet == bGreet) : undefined; - * }); - * // => true - */ - function isEqual(a, b, callback, thisArg, stackA, stackB) { - // used to indicate that when comparing objects, `a` has at least the properties of `b` - var whereIndicator = callback === indicatorObject; - if (typeof callback == 'function' && !whereIndicator) { - callback = lodash.createCallback(callback, thisArg, 2); - var result = callback(a, b); - if (typeof result != 'undefined') { - return !!result; - } - } - // exit early for identical values - if (a === b) { - // treat `+0` vs. `-0` as not equal - return a !== 0 || (1 / a == 1 / b); - } - var type = typeof a, - otherType = typeof b; - - // exit early for unlike primitive values - if (a === a && - (!a || (type != 'function' && type != 'object')) && - (!b || (otherType != 'function' && otherType != 'object'))) { + object = Object(object); + while (index--) { + var data = matchData[index]; + if ((noCustomizer && data[2]) + ? data[1] !== object[data[0]] + : !(data[0] in object) + ) { return false; } - // exit early for `null` and `undefined`, avoiding ES3's Function#call behavior - // http://es5.github.com/#x15.3.4.4 - if (a == null || b == null) { - return a === b; - } - // compare [[Class]] names - var className = toString.call(a), - otherClass = toString.call(b); + } + while (++index < length) { + data = matchData[index]; + var key = data[0], + objValue = object[key], + srcValue = data[1]; - if (className == argsClass) { - className = objectClass; - } - if (otherClass == argsClass) { - otherClass = objectClass; - } - if (className != otherClass) { - return false; - } - switch (className) { - case boolClass: - case dateClass: - // coerce dates and booleans to numbers, dates to milliseconds and booleans - // to `1` or `0`, treating invalid dates coerced to `NaN` as not equal - return +a == +b; - - case numberClass: - // treat `NaN` vs. `NaN` as equal - return (a != +a) - ? b != +b - // but treat `+0` vs. `-0` as not equal - : (a == 0 ? (1 / a == 1 / b) : a == +b); - - case regexpClass: - case stringClass: - // coerce regexes to strings (http://es5.github.com/#x15.10.6.4) - // treat string primitives and their corresponding object instances as equal - return a == String(b); - } - var isArr = className == arrayClass; - if (!isArr) { - // unwrap any `lodash` wrapped values - if (hasOwnProperty.call(a, '__wrapped__ ') || hasOwnProperty.call(b, '__wrapped__')) { - return isEqual(a.__wrapped__ || a, b.__wrapped__ || b, callback, thisArg, stackA, stackB); - } - // exit for functions and DOM nodes - if (className != objectClass || (!support.nodeClass && (isNode(a) || isNode(b)))) { + if (noCustomizer && data[2]) { + if (objValue === undefined && !(key in object)) { return false; } - // in older versions of Opera, `arguments` objects have `Array` constructors - var ctorA = !support.argsObject && isArguments(a) ? Object : a.constructor, - ctorB = !support.argsObject && isArguments(b) ? Object : b.constructor; - - // non `Object` object instances with different constructors are not equal - if (ctorA != ctorB && !( - isFunction(ctorA) && ctorA instanceof ctorA && - isFunction(ctorB) && ctorB instanceof ctorB + } else { + var stack = new Stack; + if (customizer) { + var result = customizer(objValue, srcValue, key, object, source, stack); + } + if (!(result === undefined + ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack) + : result )) { return false; } } - // assume cyclic structures are equal - // the algorithm for detecting cyclic structures is adapted from ES 5.1 - // section 15.12.3, abstract operation `JO` (http://es5.github.com/#x15.12.3) - var initedStack = !stackA; - stackA || (stackA = getArray()); - stackB || (stackB = getArray()); + } + return true; + } - var length = stackA.length; - while (length--) { - if (stackA[length] == a) { - return stackB[length] == b; - } + /** + * The base implementation of `_.isNative` without bad shim checks. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a native function, + * else `false`. + */ + function baseIsNative(value) { + if (!isObject(value) || isMasked(value)) { + return false; + } + var pattern = isFunction(value) ? reIsNative : reIsHostCtor; + return pattern.test(toSource(value)); + } + + /** + * The base implementation of `_.isSet` without Node.js optimizations. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a set, else `false`. + */ + function baseIsSet(value) { + return isObjectLike(value) && getTag(value) == setTag; + } + + /** + * The base implementation of `_.isTypedArray` without Node.js optimizations. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a typed array, else `false`. + */ + function baseIsTypedArray(value) { + return isObjectLike(value) && + isLength(value.length) && !!typedArrayTags[baseGetTag(value)]; + } + + /** + * The base implementation of `_.iteratee`. + * + * @private + * @param {*} [value=_.identity] The value to convert to an iteratee. + * @returns {Function} Returns the iteratee. + */ + function baseIteratee(value) { + // Don't store the `typeof` result in a variable to avoid a JIT bug in Safari 9. + // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details. + if (typeof value == 'function') { + return value; + } + if (value == null) { + return identity; + } + if (typeof value == 'object') { + return isArray(value) + ? baseMatchesProperty(value[0], value[1]) + : baseMatches(value); + } + return property(value); + } + + /** + * The base implementation of `_.keys` which doesn't treat sparse arrays as dense. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names. + */ + function baseKeys(object) { + if (!isPrototype(object)) { + return nativeKeys(object); + } + var result = []; + for (var key in Object(object)) { + if (hasOwnProperty.call(object, key) && key != 'constructor') { + result.push(key); } - var size = 0; - result = true; + } + return result; + } - // add `a` and `b` to the stack of traversed objects - stackA.push(a); - stackB.push(b); + /** + * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names. + */ + function baseKeysIn(object) { + if (!isObject(object)) { + return nativeKeysIn(object); + } + var isProto = isPrototype(object), + result = []; - // recursively compare objects and arrays (susceptible to call stack limits) - if (isArr) { - length = a.length; - size = b.length; - - // compare lengths to determine if a deep comparison is necessary - result = size == a.length; - if (!result && !whereIndicator) { - return result; - } - // deep compare the contents, ignoring non-numeric properties - while (size--) { - var index = length, - value = b[size]; - - if (whereIndicator) { - while (index--) { - if ((result = isEqual(a[index], value, callback, thisArg, stackA, stackB))) { - break; - } - } - } else if (!(result = isEqual(a[size], value, callback, thisArg, stackA, stackB))) { - break; - } - } - return result; + for (var key in object) { + if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) { + result.push(key); } - // deep compare objects using `forIn`, instead of `forOwn`, to avoid `Object.keys` - // which, in this case, is more costly - forIn(b, function(value, key, b) { - if (hasOwnProperty.call(b, key)) { - // count the number of properties. - size++; - // deep compare each property value. - return (result = hasOwnProperty.call(a, key) && isEqual(a[key], value, callback, thisArg, stackA, stackB)); - } - }); - - if (result && !whereIndicator) { - // ensure both objects have the same number of properties - forIn(a, function(value, key, a) { - if (hasOwnProperty.call(a, key)) { - // `size` will be `-1` if `a` has more properties than `b` - return (result = --size > -1); - } - }); - } - if (initedStack) { - releaseArray(stackA); - releaseArray(stackB); - } - return result; } + return result; + } - /** - * Checks if `value` is, or can be coerced to, a finite number. - * - * Note: This is not the same as native `isFinite`, which will return true for - * booleans and empty strings. See http://es5.github.com/#x15.1.2.5. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is finite, else `false`. - * @example - * - * _.isFinite(-101); - * // => true - * - * _.isFinite('10'); - * // => true - * - * _.isFinite(true); - * // => false - * - * _.isFinite(''); - * // => false - * - * _.isFinite(Infinity); - * // => false - */ - function isFinite(value) { - return nativeIsFinite(value) && !nativeIsNaN(parseFloat(value)); + /** + * The base implementation of `_.lt` which doesn't coerce arguments. + * + * @private + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if `value` is less than `other`, + * else `false`. + */ + function baseLt(value, other) { + return value < other; + } + + /** + * The base implementation of `_.map` without support for iteratee shorthands. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} iteratee The function invoked per iteration. + * @returns {Array} Returns the new mapped array. + */ + function baseMap(collection, iteratee) { + var index = -1, + result = isArrayLike(collection) ? Array(collection.length) : []; + + baseEach(collection, function(value, key, collection) { + result[++index] = iteratee(value, key, collection); + }); + return result; + } + + /** + * The base implementation of `_.matches` which doesn't clone `source`. + * + * @private + * @param {Object} source The object of property values to match. + * @returns {Function} Returns the new spec function. + */ + function baseMatches(source) { + var matchData = getMatchData(source); + if (matchData.length == 1 && matchData[0][2]) { + return matchesStrictComparable(matchData[0][0], matchData[0][1]); } - - /** - * Checks if `value` is a function. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is a function, else `false`. - * @example - * - * _.isFunction(_); - * // => true - */ - function isFunction(value) { - return typeof value == 'function'; - } - // fallback for older versions of Chrome and Safari - if (isFunction(/x/)) { - isFunction = function(value) { - return typeof value == 'function' && toString.call(value) == funcClass; - }; - } - - /** - * Checks if `value` is the language type of Object. - * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`) - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is an object, else `false`. - * @example - * - * _.isObject({}); - * // => true - * - * _.isObject([1, 2, 3]); - * // => true - * - * _.isObject(1); - * // => false - */ - function isObject(value) { - // check if the value is the ECMAScript language type of Object - // http://es5.github.com/#x8 - // and avoid a V8 bug - // http://code.google.com/p/v8/issues/detail?id=2291 - return !!(value && objectTypes[typeof value]); - } - - /** - * Checks if `value` is `NaN`. - * - * Note: This is not the same as native `isNaN`, which will return `true` for - * `undefined` and other values. See http://es5.github.com/#x15.1.2.4. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is `NaN`, else `false`. - * @example - * - * _.isNaN(NaN); - * // => true - * - * _.isNaN(new Number(NaN)); - * // => true - * - * isNaN(undefined); - * // => true - * - * _.isNaN(undefined); - * // => false - */ - function isNaN(value) { - // `NaN` as a primitive is the only value that is not equal to itself - // (perform the [[Class]] check first to avoid errors with some host objects in IE) - return isNumber(value) && value != +value - } - - /** - * Checks if `value` is `null`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is `null`, else `false`. - * @example - * - * _.isNull(null); - * // => true - * - * _.isNull(undefined); - * // => false - */ - function isNull(value) { - return value === null; - } - - /** - * Checks if `value` is a number. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is a number, else `false`. - * @example - * - * _.isNumber(8.4 * 5); - * // => true - */ - function isNumber(value) { - return typeof value == 'number' || toString.call(value) == numberClass; - } - - /** - * Checks if a given `value` is an object created by the `Object` constructor. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`. - * @example - * - * function Stooge(name, age) { - * this.name = name; - * this.age = age; - * } - * - * _.isPlainObject(new Stooge('moe', 40)); - * // => false - * - * _.isPlainObject([1, 2, 3]); - * // => false - * - * _.isPlainObject({ 'name': 'moe', 'age': 40 }); - * // => true - */ - var isPlainObject = !getPrototypeOf ? shimIsPlainObject : function(value) { - if (!(value && toString.call(value) == objectClass) || (!support.argsClass && isArguments(value))) { - return false; - } - var valueOf = value.valueOf, - objProto = typeof valueOf == 'function' && (objProto = getPrototypeOf(valueOf)) && getPrototypeOf(objProto); - - return objProto - ? (value == objProto || getPrototypeOf(value) == objProto) - : shimIsPlainObject(value); + return function(object) { + return object === source || baseIsMatch(object, source, matchData); }; + } - /** - * Checks if `value` is a regular expression. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is a regular expression, else `false`. - * @example - * - * _.isRegExp(/moe/); - * // => true - */ - function isRegExp(value) { - return !!(value && objectTypes[typeof value]) && toString.call(value) == regexpClass; + /** + * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`. + * + * @private + * @param {string} path The path of the property to get. + * @param {*} srcValue The value to match. + * @returns {Function} Returns the new spec function. + */ + function baseMatchesProperty(path, srcValue) { + if (isKey(path) && isStrictComparable(srcValue)) { + return matchesStrictComparable(toKey(path), srcValue); } + return function(object) { + var objValue = get(object, path); + return (objValue === undefined && objValue === srcValue) + ? hasIn(object, path) + : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG); + }; + } - /** - * Checks if `value` is a string. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is a string, else `false`. - * @example - * - * _.isString('moe'); - * // => true - */ - function isString(value) { - return typeof value == 'string' || toString.call(value) == stringClass; + /** + * The base implementation of `_.merge` without support for multiple sources. + * + * @private + * @param {Object} object The destination object. + * @param {Object} source The source object. + * @param {number} srcIndex The index of `source`. + * @param {Function} [customizer] The function to customize merged values. + * @param {Object} [stack] Tracks traversed source values and their merged + * counterparts. + */ + function baseMerge(object, source, srcIndex, customizer, stack) { + if (object === source) { + return; } - - /** - * Checks if `value` is `undefined`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Mixed} value The value to check. - * @returns {Boolean} Returns `true`, if the `value` is `undefined`, else `false`. - * @example - * - * _.isUndefined(void 0); - * // => true - */ - function isUndefined(value) { - return typeof value == 'undefined'; - } - - /** - * Recursively merges own enumerable properties of the source object(s), that - * don't resolve to `undefined`, into the destination object. Subsequent sources - * will overwrite property assignments of previous sources. If a `callback` function - * is passed, it will be executed to produce the merged values of the destination - * and source properties. If `callback` returns `undefined`, merging will be - * handled by the method instead. The `callback` is bound to `thisArg` and - * invoked with two arguments; (objectValue, sourceValue). - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The destination object. - * @param {Object} [source1, source2, ...] The source objects. - * @param {Function} [callback] The function to customize merging properties. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @param- {Object} [deepIndicator] Indicates that `stackA` and `stackB` are - * arrays of traversed objects, instead of source objects. - * @param- {Array} [stackA=[]] Tracks traversed source objects. - * @param- {Array} [stackB=[]] Associates values with source counterparts. - * @returns {Object} Returns the destination object. - * @example - * - * var names = { - * 'stooges': [ - * { 'name': 'moe' }, - * { 'name': 'larry' } - * ] - * }; - * - * var ages = { - * 'stooges': [ - * { 'age': 40 }, - * { 'age': 50 } - * ] - * }; - * - * _.merge(names, ages); - * // => { 'stooges': [{ 'name': 'moe', 'age': 40 }, { 'name': 'larry', 'age': 50 }] } - * - * var food = { - * 'fruits': ['apple'], - * 'vegetables': ['beet'] - * }; - * - * var otherFood = { - * 'fruits': ['banana'], - * 'vegetables': ['carrot'] - * }; - * - * _.merge(food, otherFood, function(a, b) { - * return _.isArray(a) ? a.concat(b) : undefined; - * }); - * // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot] } - */ - function merge(object, source, deepIndicator) { - var args = arguments, - index = 0, - length = 2; - - if (!isObject(object)) { - return object; + baseFor(source, function(srcValue, key) { + if (isObject(srcValue)) { + stack || (stack = new Stack); + baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack); } - if (deepIndicator === indicatorObject) { - var callback = args[3], - stackA = args[4], - stackB = args[5]; - } else { - var initedStack = true; - stackA = getArray(); - stackB = getArray(); + else { + var newValue = customizer + ? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack) + : undefined; - // allows working with `_.reduce` and `_.reduceRight` without - // using their `callback` arguments, `index|key` and `collection` - if (typeof deepIndicator != 'number') { - length = args.length; + if (newValue === undefined) { + newValue = srcValue; } - if (length > 3 && typeof args[length - 2] == 'function') { - callback = lodash.createCallback(args[--length - 1], args[length--], 2); - } else if (length > 2 && typeof args[length - 1] == 'function') { - callback = args[--length]; + assignMergeValue(object, key, newValue); + } + }, keysIn); + } + + /** + * A specialized version of `baseMerge` for arrays and objects which performs + * deep merges and tracks traversed objects enabling objects with circular + * references to be merged. + * + * @private + * @param {Object} object The destination object. + * @param {Object} source The source object. + * @param {string} key The key of the value to merge. + * @param {number} srcIndex The index of `source`. + * @param {Function} mergeFunc The function to merge values. + * @param {Function} [customizer] The function to customize assigned values. + * @param {Object} [stack] Tracks traversed source values and their merged + * counterparts. + */ + function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) { + var objValue = safeGet(object, key), + srcValue = safeGet(source, key), + stacked = stack.get(srcValue); + + if (stacked) { + assignMergeValue(object, key, stacked); + return; + } + var newValue = customizer + ? customizer(objValue, srcValue, (key + ''), object, source, stack) + : undefined; + + var isCommon = newValue === undefined; + + if (isCommon) { + var isArr = isArray(srcValue), + isBuff = !isArr && isBuffer(srcValue), + isTyped = !isArr && !isBuff && isTypedArray(srcValue); + + newValue = srcValue; + if (isArr || isBuff || isTyped) { + if (isArray(objValue)) { + newValue = objValue; + } + else if (isArrayLikeObject(objValue)) { + newValue = copyArray(objValue); + } + else if (isBuff) { + isCommon = false; + newValue = cloneBuffer(srcValue, true); + } + else if (isTyped) { + isCommon = false; + newValue = cloneTypedArray(srcValue, true); + } + else { + newValue = []; } } - while (++index < length) { - (isArray(args[index]) ? forEach : forOwn)(args[index], function(source, key) { - var found, - isArr, - result = source, - value = object[key]; - - if (source && ((isArr = isArray(source)) || isPlainObject(source))) { - // avoid merging previously merged cyclic sources - var stackLength = stackA.length; - while (stackLength--) { - if ((found = stackA[stackLength] == source)) { - value = stackB[stackLength]; - break; - } - } - if (!found) { - var isShallow; - if (callback) { - result = callback(value, source); - if ((isShallow = typeof result != 'undefined')) { - value = result; - } - } - if (!isShallow) { - value = isArr - ? (isArray(value) ? value : []) - : (isPlainObject(value) ? value : {}); - } - // add `source` and associated `value` to the stack of traversed objects - stackA.push(source); - stackB.push(value); - - // recursively merge objects and arrays (susceptible to call stack limits) - if (!isShallow) { - value = merge(value, source, indicatorObject, callback, stackA, stackB); - } - } - } - else { - if (callback) { - result = callback(value, source); - if (typeof result == 'undefined') { - result = source; - } - } - if (typeof result != 'undefined') { - value = result; - } - } - object[key] = value; - }); + else if (isPlainObject(srcValue) || isArguments(srcValue)) { + newValue = objValue; + if (isArguments(objValue)) { + newValue = toPlainObject(objValue); + } + else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) { + newValue = initCloneObject(srcValue); + } } - - if (initedStack) { - releaseArray(stackA); - releaseArray(stackB); + else { + isCommon = false; } + } + if (isCommon) { + // Recursively merge objects and arrays (susceptible to call stack limits). + stack.set(srcValue, newValue); + mergeFunc(newValue, srcValue, srcIndex, customizer, stack); + stack['delete'](srcValue); + } + assignMergeValue(object, key, newValue); + } + + /** + * The base implementation of `_.orderBy` without param guards. + * + * @private + * @param {Array|Object} collection The collection to iterate over. + * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by. + * @param {string[]} orders The sort orders of `iteratees`. + * @returns {Array} Returns the new sorted array. + */ + function baseOrderBy(collection, iteratees, orders) { + var index = -1; + iteratees = arrayMap(iteratees.length ? iteratees : [identity], baseUnary(getIteratee())); + + var result = baseMap(collection, function(value, key, collection) { + var criteria = arrayMap(iteratees, function(iteratee) { + return iteratee(value); + }); + return { 'criteria': criteria, 'index': ++index, 'value': value }; + }); + + return baseSortBy(result, function(object, other) { + return compareMultiple(object, other, orders); + }); + } + + /** + * The base implementation of `_.pick` without support for individual + * property identifiers. + * + * @private + * @param {Object} object The source object. + * @param {string[]} paths The property paths to pick. + * @returns {Object} Returns the new object. + */ + function basePick(object, paths) { + return basePickBy(object, paths, function(value, path) { + return hasIn(object, path); + }); + } + + /** + * The base implementation of `_.pickBy` without support for iteratee shorthands. + * + * @private + * @param {Object} object The source object. + * @param {string[]} paths The property paths to pick. + * @param {Function} predicate The function invoked per property. + * @returns {Object} Returns the new object. + */ + function basePickBy(object, paths, predicate) { + var index = -1, + length = paths.length, + result = {}; + + while (++index < length) { + var path = paths[index], + value = baseGet(object, path); + + if (predicate(value, path)) { + baseSet(result, castPath(path, object), value); + } + } + return result; + } + + /** + * A specialized version of `baseProperty` which supports deep paths. + * + * @private + * @param {Array|string} path The path of the property to get. + * @returns {Function} Returns the new accessor function. + */ + function basePropertyDeep(path) { + return function(object) { + return baseGet(object, path); + }; + } + + /** + * The base implementation of `_.range` and `_.rangeRight` which doesn't + * coerce arguments. + * + * @private + * @param {number} start The start of the range. + * @param {number} end The end of the range. + * @param {number} step The value to increment or decrement by. + * @param {boolean} [fromRight] Specify iterating from right to left. + * @returns {Array} Returns the range of numbers. + */ + function baseRange(start, end, step, fromRight) { + var index = -1, + length = nativeMax(nativeCeil((end - start) / (step || 1)), 0), + result = Array(length); + + while (length--) { + result[fromRight ? length : ++index] = start; + start += step; + } + return result; + } + + /** + * The base implementation of `_.rest` which doesn't validate or coerce arguments. + * + * @private + * @param {Function} func The function to apply a rest parameter to. + * @param {number} [start=func.length-1] The start position of the rest parameter. + * @returns {Function} Returns the new function. + */ + function baseRest(func, start) { + return setToString(overRest(func, start, identity), func + ''); + } + + /** + * The base implementation of `_.set`. + * + * @private + * @param {Object} object The object to modify. + * @param {Array|string} path The path of the property to set. + * @param {*} value The value to set. + * @param {Function} [customizer] The function to customize path creation. + * @returns {Object} Returns `object`. + */ + function baseSet(object, path, value, customizer) { + if (!isObject(object)) { return object; } + path = castPath(path, object); - /** - * Creates a shallow clone of `object` excluding the specified properties. - * Property names may be specified as individual arguments or as arrays of - * property names. If a `callback` function is passed, it will be executed - * for each property in the `object`, omitting the properties `callback` - * returns truthy for. The `callback` is bound to `thisArg` and invoked - * with three arguments; (value, key, object). - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The source object. - * @param {Function|String} callback|[prop1, prop2, ...] The properties to omit - * or the function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Object} Returns an object without the omitted properties. - * @example - * - * _.omit({ 'name': 'moe', 'age': 40 }, 'age'); - * // => { 'name': 'moe' } - * - * _.omit({ 'name': 'moe', 'age': 40 }, function(value) { - * return typeof value == 'number'; - * }); - * // => { 'name': 'moe' } - */ - function omit(object, callback, thisArg) { - var indexOf = getIndexOf(), - isFunc = typeof callback == 'function', - result = {}; + var index = -1, + length = path.length, + lastIndex = length - 1, + nested = object; - if (isFunc) { - callback = lodash.createCallback(callback, thisArg); - } else { - var props = concat.apply(arrayRef, nativeSlice.call(arguments, 1)); - } - forIn(object, function(value, key, object) { - if (isFunc - ? !callback(value, key, object) - : indexOf(props, key) < 0 - ) { - result[key] = value; + while (nested != null && ++index < length) { + var key = toKey(path[index]), + newValue = value; + + if (index != lastIndex) { + var objValue = nested[key]; + newValue = customizer ? customizer(objValue, key, nested) : undefined; + if (newValue === undefined) { + newValue = isObject(objValue) + ? objValue + : (isIndex(path[index + 1]) ? [] : {}); } - }); - return result; + } + assignValue(nested, key, newValue); + nested = nested[key]; } + return object; + } - /** - * Creates a two dimensional array of the given object's key-value pairs, - * i.e. `[[key1, value1], [key2, value2]]`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The object to inspect. - * @returns {Array} Returns new array of key-value pairs. - * @example - * - * _.pairs({ 'moe': 30, 'larry': 40 }); - * // => [['moe', 30], ['larry', 40]] (order is not guaranteed) - */ - function pairs(object) { + /** + * The base implementation of `setData` without support for hot loop shorting. + * + * @private + * @param {Function} func The function to associate metadata with. + * @param {*} data The metadata. + * @returns {Function} Returns `func`. + */ + var baseSetData = !metaMap ? identity : function(func, data) { + metaMap.set(func, data); + return func; + }; + + /** + * The base implementation of `setToString` without support for hot loop shorting. + * + * @private + * @param {Function} func The function to modify. + * @param {Function} string The `toString` result. + * @returns {Function} Returns `func`. + */ + var baseSetToString = !defineProperty ? identity : function(func, string) { + return defineProperty(func, 'toString', { + 'configurable': true, + 'enumerable': false, + 'value': constant(string), + 'writable': true + }); + }; + + /** + * The base implementation of `_.slice` without an iteratee call guard. + * + * @private + * @param {Array} array The array to slice. + * @param {number} [start=0] The start position. + * @param {number} [end=array.length] The end position. + * @returns {Array} Returns the slice of `array`. + */ + function baseSlice(array, start, end) { + var index = -1, + length = array.length; + + if (start < 0) { + start = -start > length ? 0 : (length + start); + } + end = end > length ? length : end; + if (end < 0) { + end += length; + } + length = start > end ? 0 : ((end - start) >>> 0); + start >>>= 0; + + var result = Array(length); + while (++index < length) { + result[index] = array[index + start]; + } + return result; + } + + /** + * The base implementation of `_.toString` which doesn't convert nullish + * values to empty strings. + * + * @private + * @param {*} value The value to process. + * @returns {string} Returns the string. + */ + function baseToString(value) { + // Exit early for strings to avoid a performance hit in some environments. + if (typeof value == 'string') { + return value; + } + if (isArray(value)) { + // Recursively convert values (susceptible to call stack limits). + return arrayMap(value, baseToString) + ''; + } + if (isSymbol(value)) { + return symbolToString ? symbolToString.call(value) : ''; + } + var result = (value + ''); + return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result; + } + + /** + * The base implementation of `_.uniqBy` without support for iteratee shorthands. + * + * @private + * @param {Array} array The array to inspect. + * @param {Function} [iteratee] The iteratee invoked per element. + * @param {Function} [comparator] The comparator invoked per element. + * @returns {Array} Returns the new duplicate free array. + */ + function baseUniq(array, iteratee, comparator) { + var index = -1, + includes = arrayIncludes, + length = array.length, + isCommon = true, + result = [], + seen = result; + + if (comparator) { + isCommon = false; + includes = arrayIncludesWith; + } + else if (length >= LARGE_ARRAY_SIZE) { + var set = iteratee ? null : createSet(array); + if (set) { + return setToArray(set); + } + isCommon = false; + includes = cacheHas; + seen = new SetCache; + } + else { + seen = iteratee ? [] : result; + } + outer: + while (++index < length) { + var value = array[index], + computed = iteratee ? iteratee(value) : value; + + value = (comparator || value !== 0) ? value : 0; + if (isCommon && computed === computed) { + var seenIndex = seen.length; + while (seenIndex--) { + if (seen[seenIndex] === computed) { + continue outer; + } + } + if (iteratee) { + seen.push(computed); + } + result.push(value); + } + else if (!includes(seen, computed, comparator)) { + if (seen !== result) { + seen.push(computed); + } + result.push(value); + } + } + return result; + } + + /** + * The base implementation of `_.unset`. + * + * @private + * @param {Object} object The object to modify. + * @param {Array|string} path The property path to unset. + * @returns {boolean} Returns `true` if the property is deleted, else `false`. + */ + function baseUnset(object, path) { + path = castPath(path, object); + object = parent(object, path); + return object == null || delete object[toKey(last(path))]; + } + + /** + * The base implementation of `wrapperValue` which returns the result of + * performing a sequence of actions on the unwrapped `value`, where each + * successive action is supplied the return value of the previous. + * + * @private + * @param {*} value The unwrapped value. + * @param {Array} actions Actions to perform to resolve the unwrapped value. + * @returns {*} Returns the resolved value. + */ + function baseWrapperValue(value, actions) { + var result = value; + if (result instanceof LazyWrapper) { + result = result.value(); + } + return arrayReduce(actions, function(result, action) { + return action.func.apply(action.thisArg, arrayPush([result], action.args)); + }, result); + } + + /** + * Casts `value` to an empty array if it's not an array like object. + * + * @private + * @param {*} value The value to inspect. + * @returns {Array|Object} Returns the cast array-like object. + */ + function castArrayLikeObject(value) { + return isArrayLikeObject(value) ? value : []; + } + + /** + * Casts `value` to a path array if it's not one. + * + * @private + * @param {*} value The value to inspect. + * @param {Object} [object] The object to query keys on. + * @returns {Array} Returns the cast property path array. + */ + function castPath(value, object) { + if (isArray(value)) { + return value; + } + return isKey(value, object) ? [value] : stringToPath(toString(value)); + } + + /** + * Creates a clone of `buffer`. + * + * @private + * @param {Buffer} buffer The buffer to clone. + * @param {boolean} [isDeep] Specify a deep clone. + * @returns {Buffer} Returns the cloned buffer. + */ + function cloneBuffer(buffer, isDeep) { + if (isDeep) { + return buffer.slice(); + } + var length = buffer.length, + result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length); + + buffer.copy(result); + return result; + } + + /** + * Creates a clone of `arrayBuffer`. + * + * @private + * @param {ArrayBuffer} arrayBuffer The array buffer to clone. + * @returns {ArrayBuffer} Returns the cloned array buffer. + */ + function cloneArrayBuffer(arrayBuffer) { + var result = new arrayBuffer.constructor(arrayBuffer.byteLength); + new Uint8Array(result).set(new Uint8Array(arrayBuffer)); + return result; + } + + /** + * Creates a clone of `dataView`. + * + * @private + * @param {Object} dataView The data view to clone. + * @param {boolean} [isDeep] Specify a deep clone. + * @returns {Object} Returns the cloned data view. + */ + function cloneDataView(dataView, isDeep) { + var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer; + return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength); + } + + /** + * Creates a clone of `regexp`. + * + * @private + * @param {Object} regexp The regexp to clone. + * @returns {Object} Returns the cloned regexp. + */ + function cloneRegExp(regexp) { + var result = new regexp.constructor(regexp.source, reFlags.exec(regexp)); + result.lastIndex = regexp.lastIndex; + return result; + } + + /** + * Creates a clone of the `symbol` object. + * + * @private + * @param {Object} symbol The symbol object to clone. + * @returns {Object} Returns the cloned symbol object. + */ + function cloneSymbol(symbol) { + return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {}; + } + + /** + * Creates a clone of `typedArray`. + * + * @private + * @param {Object} typedArray The typed array to clone. + * @param {boolean} [isDeep] Specify a deep clone. + * @returns {Object} Returns the cloned typed array. + */ + function cloneTypedArray(typedArray, isDeep) { + var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer; + return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length); + } + + /** + * Compares values to sort them in ascending order. + * + * @private + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {number} Returns the sort order indicator for `value`. + */ + function compareAscending(value, other) { + if (value !== other) { + var valIsDefined = value !== undefined, + valIsNull = value === null, + valIsReflexive = value === value, + valIsSymbol = isSymbol(value); + + var othIsDefined = other !== undefined, + othIsNull = other === null, + othIsReflexive = other === other, + othIsSymbol = isSymbol(other); + + if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) || + (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) || + (valIsNull && othIsDefined && othIsReflexive) || + (!valIsDefined && othIsReflexive) || + !valIsReflexive) { + return 1; + } + if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) || + (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) || + (othIsNull && valIsDefined && valIsReflexive) || + (!othIsDefined && valIsReflexive) || + !othIsReflexive) { + return -1; + } + } + return 0; + } + + /** + * Used by `_.orderBy` to compare multiple properties of a value to another + * and stable sort them. + * + * If `orders` is unspecified, all values are sorted in ascending order. Otherwise, + * specify an order of "desc" for descending or "asc" for ascending sort order + * of corresponding values. + * + * @private + * @param {Object} object The object to compare. + * @param {Object} other The other object to compare. + * @param {boolean[]|string[]} orders The order to sort by for each property. + * @returns {number} Returns the sort order indicator for `object`. + */ + function compareMultiple(object, other, orders) { + var index = -1, + objCriteria = object.criteria, + othCriteria = other.criteria, + length = objCriteria.length, + ordersLength = orders.length; + + while (++index < length) { + var result = compareAscending(objCriteria[index], othCriteria[index]); + if (result) { + if (index >= ordersLength) { + return result; + } + var order = orders[index]; + return result * (order == 'desc' ? -1 : 1); + } + } + // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications + // that causes it, under certain circumstances, to provide the same value for + // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247 + // for more details. + // + // This also ensures a stable sort in V8 and other engines. + // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details. + return object.index - other.index; + } + + /** + * Creates an array that is the composition of partially applied arguments, + * placeholders, and provided arguments into a single array of arguments. + * + * @private + * @param {Array} args The provided arguments. + * @param {Array} partials The arguments to prepend to those provided. + * @param {Array} holders The `partials` placeholder indexes. + * @params {boolean} [isCurried] Specify composing for a curried function. + * @returns {Array} Returns the new array of composed arguments. + */ + function composeArgs(args, partials, holders, isCurried) { + var argsIndex = -1, + argsLength = args.length, + holdersLength = holders.length, + leftIndex = -1, + leftLength = partials.length, + rangeLength = nativeMax(argsLength - holdersLength, 0), + result = Array(leftLength + rangeLength), + isUncurried = !isCurried; + + while (++leftIndex < leftLength) { + result[leftIndex] = partials[leftIndex]; + } + while (++argsIndex < holdersLength) { + if (isUncurried || argsIndex < argsLength) { + result[holders[argsIndex]] = args[argsIndex]; + } + } + while (rangeLength--) { + result[leftIndex++] = args[argsIndex++]; + } + return result; + } + + /** + * This function is like `composeArgs` except that the arguments composition + * is tailored for `_.partialRight`. + * + * @private + * @param {Array} args The provided arguments. + * @param {Array} partials The arguments to append to those provided. + * @param {Array} holders The `partials` placeholder indexes. + * @params {boolean} [isCurried] Specify composing for a curried function. + * @returns {Array} Returns the new array of composed arguments. + */ + function composeArgsRight(args, partials, holders, isCurried) { + var argsIndex = -1, + argsLength = args.length, + holdersIndex = -1, + holdersLength = holders.length, + rightIndex = -1, + rightLength = partials.length, + rangeLength = nativeMax(argsLength - holdersLength, 0), + result = Array(rangeLength + rightLength), + isUncurried = !isCurried; + + while (++argsIndex < rangeLength) { + result[argsIndex] = args[argsIndex]; + } + var offset = argsIndex; + while (++rightIndex < rightLength) { + result[offset + rightIndex] = partials[rightIndex]; + } + while (++holdersIndex < holdersLength) { + if (isUncurried || argsIndex < argsLength) { + result[offset + holders[holdersIndex]] = args[argsIndex++]; + } + } + return result; + } + + /** + * Copies the values of `source` to `array`. + * + * @private + * @param {Array} source The array to copy values from. + * @param {Array} [array=[]] The array to copy values to. + * @returns {Array} Returns `array`. + */ + function copyArray(source, array) { + var index = -1, + length = source.length; + + array || (array = Array(length)); + while (++index < length) { + array[index] = source[index]; + } + return array; + } + + /** + * Copies properties of `source` to `object`. + * + * @private + * @param {Object} source The object to copy properties from. + * @param {Array} props The property identifiers to copy. + * @param {Object} [object={}] The object to copy properties to. + * @param {Function} [customizer] The function to customize copied values. + * @returns {Object} Returns `object`. + */ + function copyObject(source, props, object, customizer) { + var isNew = !object; + object || (object = {}); + + var index = -1, + length = props.length; + + while (++index < length) { + var key = props[index]; + + var newValue = customizer + ? customizer(object[key], source[key], key, object, source) + : undefined; + + if (newValue === undefined) { + newValue = source[key]; + } + if (isNew) { + baseAssignValue(object, key, newValue); + } else { + assignValue(object, key, newValue); + } + } + return object; + } + + /** + * Copies own symbols of `source` to `object`. + * + * @private + * @param {Object} source The object to copy symbols from. + * @param {Object} [object={}] The object to copy symbols to. + * @returns {Object} Returns `object`. + */ + function copySymbols(source, object) { + return copyObject(source, getSymbols(source), object); + } + + /** + * Copies own and inherited symbols of `source` to `object`. + * + * @private + * @param {Object} source The object to copy symbols from. + * @param {Object} [object={}] The object to copy symbols to. + * @returns {Object} Returns `object`. + */ + function copySymbolsIn(source, object) { + return copyObject(source, getSymbolsIn(source), object); + } + + /** + * Creates a function like `_.assign`. + * + * @private + * @param {Function} assigner The function to assign values. + * @returns {Function} Returns the new assigner function. + */ + function createAssigner(assigner) { + return baseRest(function(object, sources) { var index = -1, - props = keys(object), - length = props.length, - result = Array(length); + length = sources.length, + customizer = length > 1 ? sources[length - 1] : undefined, + guard = length > 2 ? sources[2] : undefined; + customizer = (assigner.length > 3 && typeof customizer == 'function') + ? (length--, customizer) + : undefined; + + if (guard && isIterateeCall(sources[0], sources[1], guard)) { + customizer = length < 3 ? undefined : customizer; + length = 1; + } + object = Object(object); while (++index < length) { - var key = props[index]; - result[index] = [key, object[key]]; - } - return result; - } - - /** - * Creates a shallow clone of `object` composed of the specified properties. - * Property names may be specified as individual arguments or as arrays of property - * names. If `callback` is passed, it will be executed for each property in the - * `object`, picking the properties `callback` returns truthy for. The `callback` - * is bound to `thisArg` and invoked with three arguments; (value, key, object). - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The source object. - * @param {Array|Function|String} callback|[prop1, prop2, ...] The function called - * per iteration or properties to pick, either as individual arguments or arrays. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Object} Returns an object composed of the picked properties. - * @example - * - * _.pick({ 'name': 'moe', '_userid': 'moe1' }, 'name'); - * // => { 'name': 'moe' } - * - * _.pick({ 'name': 'moe', '_userid': 'moe1' }, function(value, key) { - * return key.charAt(0) != '_'; - * }); - * // => { 'name': 'moe' } - */ - function pick(object, callback, thisArg) { - var result = {}; - if (typeof callback != 'function') { - var index = -1, - props = concat.apply(arrayRef, nativeSlice.call(arguments, 1)), - length = isObject(object) ? props.length : 0; - - while (++index < length) { - var key = props[index]; - if (key in object) { - result[key] = object[key]; - } - } - } else { - callback = lodash.createCallback(callback, thisArg); - forIn(object, function(value, key, object) { - if (callback(value, key, object)) { - result[key] = value; - } - }); - } - return result; - } - - /** - * An alternative to `_.reduce`, this method transforms an `object` to a new - * `accumulator` object which is the result of running each of its elements - * through the `callback`, with each `callback` execution potentially mutating - * the `accumulator` object. The `callback` is bound to `thisArg` and invoked - * with four arguments; (accumulator, value, key, object). Callbacks may exit - * iteration early by explicitly returning `false`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Array|Object} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [accumulator] The custom accumulator value. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the accumulated value. - * @example - * - * var squares = _.transform([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], function(result, num) { - * num *= num; - * if (num % 2) { - * return result.push(num) < 3; - * } - * }); - * // => [1, 9, 25] - * - * var mapped = _.transform({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) { - * result[key] = num * 3; - * }); - * // => { 'a': 3, 'b': 6, 'c': 9 } - */ - function transform(object, callback, accumulator, thisArg) { - var isArr = isArray(object); - callback = lodash.createCallback(callback, thisArg, 4); - - if (accumulator == null) { - if (isArr) { - accumulator = []; - } else { - var ctor = object && object.constructor, - proto = ctor && ctor.prototype; - - accumulator = createObject(proto); + var source = sources[index]; + if (source) { + assigner(object, source, index, customizer); } } - (isArr ? basicEach : forOwn)(object, function(value, index, object) { - return callback(accumulator, value, index, object); - }); - return accumulator; - } + return object; + }); + } - /** - * Creates an array composed of the own enumerable property values of `object`. - * - * @static - * @memberOf _ - * @category Objects - * @param {Object} object The object to inspect. - * @returns {Array} Returns a new array of property values. - * @example - * - * _.values({ 'one': 1, 'two': 2, 'three': 3 }); - * // => [1, 2, 3] (order is not guaranteed) - */ - function values(object) { - var index = -1, - props = keys(object), - length = props.length, - result = Array(length); - - while (++index < length) { - result[index] = object[props[index]]; + /** + * Creates a `baseEach` or `baseEachRight` function. + * + * @private + * @param {Function} eachFunc The function to iterate over a collection. + * @param {boolean} [fromRight] Specify iterating from right to left. + * @returns {Function} Returns the new base function. + */ + function createBaseEach(eachFunc, fromRight) { + return function(collection, iteratee) { + if (collection == null) { + return collection; } - return result; - } - - /*--------------------------------------------------------------------------*/ - - /** - * Creates an array of elements from the specified indexes, or keys, of the - * `collection`. Indexes may be specified as individual arguments or as arrays - * of indexes. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Array|Number|String} [index1, index2, ...] The indexes of - * `collection` to retrieve, either as individual arguments or arrays. - * @returns {Array} Returns a new array of elements corresponding to the - * provided indexes. - * @example - * - * _.at(['a', 'b', 'c', 'd', 'e'], [0, 2, 4]); - * // => ['a', 'c', 'e'] - * - * _.at(['moe', 'larry', 'curly'], 0, 2); - * // => ['moe', 'curly'] - */ - function at(collection) { - var index = -1, - props = concat.apply(arrayRef, nativeSlice.call(arguments, 1)), - length = props.length, - result = Array(length); - - if (support.unindexedChars && isString(collection)) { - collection = collection.split(''); + if (!isArrayLike(collection)) { + return eachFunc(collection, iteratee); } - while(++index < length) { - result[index] = collection[props[index]]; - } - return result; - } + var length = collection.length, + index = fromRight ? length : -1, + iterable = Object(collection); - /** - * Checks if a given `target` element is present in a `collection` using strict - * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used - * as the offset from the end of the collection. - * - * @static - * @memberOf _ - * @alias include - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Mixed} target The value to check for. - * @param {Number} [fromIndex=0] The index to search from. - * @returns {Boolean} Returns `true` if the `target` element is found, else `false`. - * @example - * - * _.contains([1, 2, 3], 1); - * // => true - * - * _.contains([1, 2, 3], 1, 2); - * // => false - * - * _.contains({ 'name': 'moe', 'age': 40 }, 'moe'); - * // => true - * - * _.contains('curly', 'ur'); - * // => true - */ - function contains(collection, target, fromIndex) { - var index = -1, - indexOf = getIndexOf(), - length = collection ? collection.length : 0, - result = false; - - fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex) || 0; - if (length && typeof length == 'number') { - result = (isString(collection) - ? collection.indexOf(target, fromIndex) - : indexOf(collection, target, fromIndex) - ) > -1; - } else { - basicEach(collection, function(value) { - if (++index >= fromIndex) { - return !(result = value === target); - } - }); - } - return result; - } - - /** - * Creates an object composed of keys returned from running each element of the - * `collection` through the given `callback`. The corresponding value of each key - * is the number of times the key was returned by the `callback`. The `callback` - * is bound to `thisArg` and invoked with three arguments; (value, index|key, collection). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Object} Returns the composed aggregate object. - * @example - * - * _.countBy([4.3, 6.1, 6.4], function(num) { return Math.floor(num); }); - * // => { '4': 1, '6': 2 } - * - * _.countBy([4.3, 6.1, 6.4], function(num) { return this.floor(num); }, Math); - * // => { '4': 1, '6': 2 } - * - * _.countBy(['one', 'two', 'three'], 'length'); - * // => { '3': 2, '5': 1 } - */ - function countBy(collection, callback, thisArg) { - var result = {}; - callback = lodash.createCallback(callback, thisArg); - - forEach(collection, function(value, key, collection) { - key = String(callback(value, key, collection)); - (hasOwnProperty.call(result, key) ? result[key]++ : result[key] = 1); - }); - return result; - } - - /** - * Checks if the `callback` returns a truthy value for **all** elements of a - * `collection`. The `callback` is bound to `thisArg` and invoked with three - * arguments; (value, index|key, collection). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @alias all - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Boolean} Returns `true` if all elements pass the callback check, - * else `false`. - * @example - * - * _.every([true, 1, null, 'yes'], Boolean); - * // => false - * - * var stooges = [ - * { 'name': 'moe', 'age': 40 }, - * { 'name': 'larry', 'age': 50 } - * ]; - * - * // using "_.pluck" callback shorthand - * _.every(stooges, 'age'); - * // => true - * - * // using "_.where" callback shorthand - * _.every(stooges, { 'age': 50 }); - * // => false - */ - function every(collection, callback, thisArg) { - var result = true; - callback = lodash.createCallback(callback, thisArg); - - if (isArray(collection)) { - var index = -1, - length = collection.length; - - while (++index < length) { - if (!(result = !!callback(collection[index], index, collection))) { - break; - } + while ((fromRight ? index-- : ++index < length)) { + if (iteratee(iterable[index], index, iterable) === false) { + break; } - } else { - basicEach(collection, function(value, index, collection) { - return (result = !!callback(value, index, collection)); - }); - } - return result; - } - - /** - * Examines each element in a `collection`, returning an array of all elements - * the `callback` returns truthy for. The `callback` is bound to `thisArg` and - * invoked with three arguments; (value, index|key, collection). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @alias select - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array} Returns a new array of elements that passed the callback check. - * @example - * - * var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); - * // => [2, 4, 6] - * - * var food = [ - * { 'name': 'apple', 'organic': false, 'type': 'fruit' }, - * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' } - * ]; - * - * // using "_.pluck" callback shorthand - * _.filter(food, 'organic'); - * // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }] - * - * // using "_.where" callback shorthand - * _.filter(food, { 'type': 'fruit' }); - * // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }] - */ - function filter(collection, callback, thisArg) { - var result = []; - callback = lodash.createCallback(callback, thisArg); - - if (isArray(collection)) { - var index = -1, - length = collection.length; - - while (++index < length) { - var value = collection[index]; - if (callback(value, index, collection)) { - result.push(value); - } - } - } else { - basicEach(collection, function(value, index, collection) { - if (callback(value, index, collection)) { - result.push(value); - } - }); - } - return result; - } - - /** - * Examines each element in a `collection`, returning the first that the `callback` - * returns truthy for. The `callback` is bound to `thisArg` and invoked with three - * arguments; (value, index|key, collection). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @alias detect, findWhere - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the found element, else `undefined`. - * @example - * - * _.find([1, 2, 3, 4], function(num) { - * return num % 2 == 0; - * }); - * // => 2 - * - * var food = [ - * { 'name': 'apple', 'organic': false, 'type': 'fruit' }, - * { 'name': 'banana', 'organic': true, 'type': 'fruit' }, - * { 'name': 'beet', 'organic': false, 'type': 'vegetable' } - * ]; - * - * // using "_.where" callback shorthand - * _.find(food, { 'type': 'vegetable' }); - * // => { 'name': 'beet', 'organic': false, 'type': 'vegetable' } - * - * // using "_.pluck" callback shorthand - * _.find(food, 'organic'); - * // => { 'name': 'banana', 'organic': true, 'type': 'fruit' } - */ - function find(collection, callback, thisArg) { - callback = lodash.createCallback(callback, thisArg); - - if (isArray(collection)) { - var index = -1, - length = collection.length; - - while (++index < length) { - var value = collection[index]; - if (callback(value, index, collection)) { - return value; - } - } - } else { - var result; - basicEach(collection, function(value, index, collection) { - if (callback(value, index, collection)) { - result = value; - return false; - } - }); - return result; - } - } - - /** - * Iterates over a `collection`, executing the `callback` for each element in - * the `collection`. The `callback` is bound to `thisArg` and invoked with three - * arguments; (value, index|key, collection). Callbacks may exit iteration early - * by explicitly returning `false`. - * - * @static - * @memberOf _ - * @alias each - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array|Object|String} Returns `collection`. - * @example - * - * _([1, 2, 3]).forEach(alert).join(','); - * // => alerts each number and returns '1,2,3' - * - * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, alert); - * // => alerts each number value (order is not guaranteed) - */ - function forEach(collection, callback, thisArg) { - if (callback && typeof thisArg == 'undefined' && isArray(collection)) { - var index = -1, - length = collection.length; - - while (++index < length) { - if (callback(collection[index], index, collection) === false) { - break; - } - } - } else { - basicEach(collection, callback, thisArg); } return collection; - } + }; + } - /** - * Creates an object composed of keys returned from running each element of the - * `collection` through the `callback`. The corresponding value of each key is - * an array of elements passed to `callback` that returned the key. The `callback` - * is bound to `thisArg` and invoked with three arguments; (value, index|key, collection). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false` - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Object} Returns the composed aggregate object. - * @example - * - * _.groupBy([4.2, 6.1, 6.4], function(num) { return Math.floor(num); }); - * // => { '4': [4.2], '6': [6.1, 6.4] } - * - * _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math); - * // => { '4': [4.2], '6': [6.1, 6.4] } - * - * // using "_.pluck" callback shorthand - * _.groupBy(['one', 'two', 'three'], 'length'); - * // => { '3': ['one', 'two'], '5': ['three'] } - */ - function groupBy(collection, callback, thisArg) { - var result = {}; - callback = lodash.createCallback(callback, thisArg); - - forEach(collection, function(value, key, collection) { - key = String(callback(value, key, collection)); - (hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value); - }); - return result; - } - - /** - * Invokes the method named by `methodName` on each element in the `collection`, - * returning an array of the results of each invoked method. Additional arguments - * will be passed to each invoked method. If `methodName` is a function, it will - * be invoked for, and `this` bound to, each element in the `collection`. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|String} methodName The name of the method to invoke or - * the function invoked per iteration. - * @param {Mixed} [arg1, arg2, ...] Arguments to invoke the method with. - * @returns {Array} Returns a new array of the results of each invoked method. - * @example - * - * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort'); - * // => [[1, 5, 7], [1, 2, 3]] - * - * _.invoke([123, 456], String.prototype.split, ''); - * // => [['1', '2', '3'], ['4', '5', '6']] - */ - function invoke(collection, methodName) { - var args = nativeSlice.call(arguments, 2), - index = -1, - isFunc = typeof methodName == 'function', - length = collection ? collection.length : 0, - result = Array(typeof length == 'number' ? length : 0); - - forEach(collection, function(value) { - result[++index] = (isFunc ? methodName : value[methodName]).apply(value, args); - }); - return result; - } - - /** - * Creates an array of values by running each element in the `collection` - * through the `callback`. The `callback` is bound to `thisArg` and invoked with - * three arguments; (value, index|key, collection). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @alias collect - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array} Returns a new array of the results of each `callback` execution. - * @example - * - * _.map([1, 2, 3], function(num) { return num * 3; }); - * // => [3, 6, 9] - * - * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; }); - * // => [3, 6, 9] (order is not guaranteed) - * - * var stooges = [ - * { 'name': 'moe', 'age': 40 }, - * { 'name': 'larry', 'age': 50 } - * ]; - * - * // using "_.pluck" callback shorthand - * _.map(stooges, 'name'); - * // => ['moe', 'larry'] - */ - function map(collection, callback, thisArg) { + /** + * Creates a base function for methods like `_.forIn` and `_.forOwn`. + * + * @private + * @param {boolean} [fromRight] Specify iterating from right to left. + * @returns {Function} Returns the new base function. + */ + function createBaseFor(fromRight) { + return function(object, iteratee, keysFunc) { var index = -1, - length = collection ? collection.length : 0, - result = Array(typeof length == 'number' ? length : 0); + iterable = Object(object), + props = keysFunc(object), + length = props.length; - callback = lodash.createCallback(callback, thisArg); - if (isArray(collection)) { - while (++index < length) { - result[index] = callback(collection[index], index, collection); - } - } else { - basicEach(collection, function(value, key, collection) { - result[++index] = callback(value, key, collection); - }); - } - return result; - } - - /** - * Retrieves the maximum value of an `array`. If `callback` is passed, - * it will be executed for each value in the `array` to generate the - * criterion by which the value is ranked. The `callback` is bound to - * `thisArg` and invoked with three arguments; (value, index, collection). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the maximum value. - * @example - * - * _.max([4, 2, 8, 6]); - * // => 8 - * - * var stooges = [ - * { 'name': 'moe', 'age': 40 }, - * { 'name': 'larry', 'age': 50 } - * ]; - * - * _.max(stooges, function(stooge) { return stooge.age; }); - * // => { 'name': 'larry', 'age': 50 }; - * - * // using "_.pluck" callback shorthand - * _.max(stooges, 'age'); - * // => { 'name': 'larry', 'age': 50 }; - */ - function max(collection, callback, thisArg) { - var computed = -Infinity, - result = computed; - - if (!callback && isArray(collection)) { - var index = -1, - length = collection.length; - - while (++index < length) { - var value = collection[index]; - if (value > result) { - result = value; - } - } - } else { - callback = (!callback && isString(collection)) - ? charAtCallback - : lodash.createCallback(callback, thisArg); - - basicEach(collection, function(value, index, collection) { - var current = callback(value, index, collection); - if (current > computed) { - computed = current; - result = value; - } - }); - } - return result; - } - - /** - * Retrieves the minimum value of an `array`. If `callback` is passed, - * it will be executed for each value in the `array` to generate the - * criterion by which the value is ranked. The `callback` is bound to `thisArg` - * and invoked with three arguments; (value, index, collection). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the minimum value. - * @example - * - * _.min([4, 2, 8, 6]); - * // => 2 - * - * var stooges = [ - * { 'name': 'moe', 'age': 40 }, - * { 'name': 'larry', 'age': 50 } - * ]; - * - * _.min(stooges, function(stooge) { return stooge.age; }); - * // => { 'name': 'moe', 'age': 40 }; - * - * // using "_.pluck" callback shorthand - * _.min(stooges, 'age'); - * // => { 'name': 'moe', 'age': 40 }; - */ - function min(collection, callback, thisArg) { - var computed = Infinity, - result = computed; - - if (!callback && isArray(collection)) { - var index = -1, - length = collection.length; - - while (++index < length) { - var value = collection[index]; - if (value < result) { - result = value; - } - } - } else { - callback = (!callback && isString(collection)) - ? charAtCallback - : lodash.createCallback(callback, thisArg); - - basicEach(collection, function(value, index, collection) { - var current = callback(value, index, collection); - if (current < computed) { - computed = current; - result = value; - } - }); - } - return result; - } - - /** - * Retrieves the value of a specified property from all elements in the `collection`. - * - * @static - * @memberOf _ - * @type Function - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {String} property The property to pluck. - * @returns {Array} Returns a new array of property values. - * @example - * - * var stooges = [ - * { 'name': 'moe', 'age': 40 }, - * { 'name': 'larry', 'age': 50 } - * ]; - * - * _.pluck(stooges, 'name'); - * // => ['moe', 'larry'] - */ - var pluck = map; - - /** - * Reduces a `collection` to a value which is the accumulated result of running - * each element in the `collection` through the `callback`, where each successive - * `callback` execution consumes the return value of the previous execution. - * If `accumulator` is not passed, the first element of the `collection` will be - * used as the initial `accumulator` value. The `callback` is bound to `thisArg` - * and invoked with four arguments; (accumulator, value, index|key, collection). - * - * @static - * @memberOf _ - * @alias foldl, inject - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [accumulator] Initial value of the accumulator. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the accumulated value. - * @example - * - * var sum = _.reduce([1, 2, 3], function(sum, num) { - * return sum + num; - * }); - * // => 6 - * - * var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) { - * result[key] = num * 3; - * return result; - * }, {}); - * // => { 'a': 3, 'b': 6, 'c': 9 } - */ - function reduce(collection, callback, accumulator, thisArg) { - var noaccum = arguments.length < 3; - callback = lodash.createCallback(callback, thisArg, 4); - - if (isArray(collection)) { - var index = -1, - length = collection.length; - - if (noaccum) { - accumulator = collection[++index]; - } - while (++index < length) { - accumulator = callback(accumulator, collection[index], index, collection); - } - } else { - basicEach(collection, function(value, index, collection) { - accumulator = noaccum - ? (noaccum = false, value) - : callback(accumulator, value, index, collection) - }); - } - return accumulator; - } - - /** - * This method is similar to `_.reduce`, except that it iterates over a - * `collection` from right to left. - * - * @static - * @memberOf _ - * @alias foldr - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function} [callback=identity] The function called per iteration. - * @param {Mixed} [accumulator] Initial value of the accumulator. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the accumulated value. - * @example - * - * var list = [[0, 1], [2, 3], [4, 5]]; - * var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []); - * // => [4, 5, 2, 3, 0, 1] - */ - function reduceRight(collection, callback, accumulator, thisArg) { - var iterable = collection, - length = collection ? collection.length : 0, - noaccum = arguments.length < 3; - - if (typeof length != 'number') { - var props = keys(collection); - length = props.length; - } else if (support.unindexedChars && isString(collection)) { - iterable = collection.split(''); - } - callback = lodash.createCallback(callback, thisArg, 4); - forEach(collection, function(value, index, collection) { - index = props ? props[--length] : --length; - accumulator = noaccum - ? (noaccum = false, iterable[index]) - : callback(accumulator, iterable[index], index, collection); - }); - return accumulator; - } - - /** - * The opposite of `_.filter`, this method returns the elements of a - * `collection` that `callback` does **not** return truthy for. - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array} Returns a new array of elements that did **not** pass the - * callback check. - * @example - * - * var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); - * // => [1, 3, 5] - * - * var food = [ - * { 'name': 'apple', 'organic': false, 'type': 'fruit' }, - * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' } - * ]; - * - * // using "_.pluck" callback shorthand - * _.reject(food, 'organic'); - * // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }] - * - * // using "_.where" callback shorthand - * _.reject(food, { 'type': 'fruit' }); - * // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }] - */ - function reject(collection, callback, thisArg) { - callback = lodash.createCallback(callback, thisArg); - return filter(collection, function(value, index, collection) { - return !callback(value, index, collection); - }); - } - - /** - * Creates an array of shuffled `array` values, using a version of the - * Fisher-Yates shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to shuffle. - * @returns {Array} Returns a new shuffled collection. - * @example - * - * _.shuffle([1, 2, 3, 4, 5, 6]); - * // => [4, 1, 6, 3, 5, 2] - */ - function shuffle(collection) { - var index = -1, - length = collection ? collection.length : 0, - result = Array(typeof length == 'number' ? length : 0); - - forEach(collection, function(value) { - var rand = floor(nativeRandom() * (++index + 1)); - result[index] = result[rand]; - result[rand] = value; - }); - return result; - } - - /** - * Gets the size of the `collection` by returning `collection.length` for arrays - * and array-like objects or the number of own enumerable properties for objects. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to inspect. - * @returns {Number} Returns `collection.length` or number of own enumerable properties. - * @example - * - * _.size([1, 2]); - * // => 2 - * - * _.size({ 'one': 1, 'two': 2, 'three': 3 }); - * // => 3 - * - * _.size('curly'); - * // => 5 - */ - function size(collection) { - var length = collection ? collection.length : 0; - return typeof length == 'number' ? length : keys(collection).length; - } - - /** - * Checks if the `callback` returns a truthy value for **any** element of a - * `collection`. The function returns as soon as it finds passing value, and - * does not iterate over the entire `collection`. The `callback` is bound to - * `thisArg` and invoked with three arguments; (value, index|key, collection). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @alias any - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Boolean} Returns `true` if any element passes the callback check, - * else `false`. - * @example - * - * _.some([null, 0, 'yes', false], Boolean); - * // => true - * - * var food = [ - * { 'name': 'apple', 'organic': false, 'type': 'fruit' }, - * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' } - * ]; - * - * // using "_.pluck" callback shorthand - * _.some(food, 'organic'); - * // => true - * - * // using "_.where" callback shorthand - * _.some(food, { 'type': 'meat' }); - * // => false - */ - function some(collection, callback, thisArg) { - var result; - callback = lodash.createCallback(callback, thisArg); - - if (isArray(collection)) { - var index = -1, - length = collection.length; - - while (++index < length) { - if ((result = callback(collection[index], index, collection))) { - break; - } - } - } else { - basicEach(collection, function(value, index, collection) { - return !(result = callback(value, index, collection)); - }); - } - return !!result; - } - - /** - * Creates an array of elements, sorted in ascending order by the results of - * running each element in the `collection` through the `callback`. This method - * performs a stable sort, that is, it will preserve the original sort order of - * equal elements. The `callback` is bound to `thisArg` and invoked with three - * arguments; (value, index|key, collection). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array} Returns a new array of sorted elements. - * @example - * - * _.sortBy([1, 2, 3], function(num) { return Math.sin(num); }); - * // => [3, 1, 2] - * - * _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math); - * // => [3, 1, 2] - * - * // using "_.pluck" callback shorthand - * _.sortBy(['banana', 'strawberry', 'apple'], 'length'); - * // => ['apple', 'banana', 'strawberry'] - */ - function sortBy(collection, callback, thisArg) { - var index = -1, - length = collection ? collection.length : 0, - result = Array(typeof length == 'number' ? length : 0); - - callback = lodash.createCallback(callback, thisArg); - forEach(collection, function(value, key, collection) { - var object = result[++index] = getObject(); - object.criteria = callback(value, key, collection); - object.index = index; - object.value = value; - }); - - length = result.length; - result.sort(compareAscending); while (length--) { - var object = result[length]; - result[length] = object.value; - releaseObject(object); - } - return result; - } - - /** - * Converts the `collection` to an array. - * - * @static - * @memberOf _ - * @category Collections - * @param {Array|Object|String} collection The collection to convert. - * @returns {Array} Returns the new converted array. - * @example - * - * (function() { return _.toArray(arguments).slice(1); })(1, 2, 3, 4); - * // => [2, 3, 4] - */ - function toArray(collection) { - if (collection && typeof collection.length == 'number') { - return (support.unindexedChars && isString(collection)) - ? collection.split('') - : slice(collection); - } - return values(collection); - } - - /** - * Examines each element in a `collection`, returning an array of all elements - * that have the given `properties`. When checking `properties`, this method - * performs a deep comparison between values to determine if they are equivalent - * to each other. - * - * @static - * @memberOf _ - * @type Function - * @category Collections - * @param {Array|Object|String} collection The collection to iterate over. - * @param {Object} properties The object of property values to filter by. - * @returns {Array} Returns a new array of elements that have the given `properties`. - * @example - * - * var stooges = [ - * { 'name': 'moe', 'age': 40 }, - * { 'name': 'larry', 'age': 50 } - * ]; - * - * _.where(stooges, { 'age': 40 }); - * // => [{ 'name': 'moe', 'age': 40 }] - */ - var where = filter; - - /*--------------------------------------------------------------------------*/ - - /** - * Creates an array with all falsey values of `array` removed. The values - * `false`, `null`, `0`, `""`, `undefined` and `NaN` are all falsey. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} array The array to compact. - * @returns {Array} Returns a new filtered array. - * @example - * - * _.compact([0, 1, false, 2, '', 3]); - * // => [1, 2, 3] - */ - function compact(array) { - var index = -1, - length = array ? array.length : 0, - result = []; - - while (++index < length) { - var value = array[index]; - if (value) { - result.push(value); + var key = props[fromRight ? length : ++index]; + if (iteratee(iterable[key], key, iterable) === false) { + break; } } - return result; - } - - /** - * Creates an array of `array` elements not present in the other arrays - * using strict equality for comparisons, i.e. `===`. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} array The array to process. - * @param {Array} [array1, array2, ...] Arrays to check. - * @returns {Array} Returns a new array of `array` elements not present in the - * other arrays. - * @example - * - * _.difference([1, 2, 3, 4, 5], [5, 2, 10]); - * // => [1, 3, 4] - */ - function difference(array) { - var index = -1, - indexOf = getIndexOf(), - length = array ? array.length : 0, - seen = concat.apply(arrayRef, nativeSlice.call(arguments, 1)), - result = []; - - var isLarge = length >= largeArraySize && indexOf === basicIndexOf; - - if (isLarge) { - var cache = createCache(seen); - if (cache) { - indexOf = cacheIndexOf; - seen = cache; - } else { - isLarge = false; - } - } - while (++index < length) { - var value = array[index]; - if (indexOf(seen, value) < 0) { - result.push(value); - } - } - if (isLarge) { - releaseObject(seen); - } - return result; - } - - /** - * This method is similar to `_.find`, except that it returns the index of - * the element that passes the callback check, instead of the element itself. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} array The array to search. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the index of the found element, else `-1`. - * @example - * - * _.findIndex(['apple', 'banana', 'beet'], function(food) { - * return /^b/.test(food); - * }); - * // => 1 - */ - function findIndex(array, callback, thisArg) { - var index = -1, - length = array ? array.length : 0; - - callback = lodash.createCallback(callback, thisArg); - while (++index < length) { - if (callback(array[index], index, array)) { - return index; - } - } - return -1; - } - - /** - * Gets the first element of the `array`. If a number `n` is passed, the first - * `n` elements of the `array` are returned. If a `callback` function is passed, - * elements at the beginning of the array are returned as long as the `callback` - * returns truthy. The `callback` is bound to `thisArg` and invoked with three - * arguments; (value, index, array). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @alias head, take - * @category Arrays - * @param {Array} array The array to query. - * @param {Function|Object|Number|String} [callback|n] The function called - * per element or the number of elements to return. If a property name or - * object is passed, it will be used to create a "_.pluck" or "_.where" - * style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the first element(s) of `array`. - * @example - * - * _.first([1, 2, 3]); - * // => 1 - * - * _.first([1, 2, 3], 2); - * // => [1, 2] - * - * _.first([1, 2, 3], function(num) { - * return num < 3; - * }); - * // => [1, 2] - * - * var food = [ - * { 'name': 'banana', 'organic': true }, - * { 'name': 'beet', 'organic': false }, - * ]; - * - * // using "_.pluck" callback shorthand - * _.first(food, 'organic'); - * // => [{ 'name': 'banana', 'organic': true }] - * - * var food = [ - * { 'name': 'apple', 'type': 'fruit' }, - * { 'name': 'banana', 'type': 'fruit' }, - * { 'name': 'beet', 'type': 'vegetable' } - * ]; - * - * // using "_.where" callback shorthand - * _.first(food, { 'type': 'fruit' }); - * // => [{ 'name': 'apple', 'type': 'fruit' }, { 'name': 'banana', 'type': 'fruit' }] - */ - function first(array, callback, thisArg) { - if (array) { - var n = 0, - length = array.length; - - if (typeof callback != 'number' && callback != null) { - var index = -1; - callback = lodash.createCallback(callback, thisArg); - while (++index < length && callback(array[index], index, array)) { - n++; - } - } else { - n = callback; - if (n == null || thisArg) { - return array[0]; - } - } - return slice(array, 0, nativeMin(nativeMax(0, n), length)); - } - } - - /** - * Flattens a nested array (the nesting can be to any depth). If `isShallow` - * is truthy, `array` will only be flattened a single level. If `callback` - * is passed, each element of `array` is passed through a `callback` before - * flattening. The `callback` is bound to `thisArg` and invoked with three - * arguments; (value, index, array). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} array The array to flatten. - * @param {Boolean} [isShallow=false] A flag to indicate only flattening a single level. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array} Returns a new flattened array. - * @example - * - * _.flatten([1, [2], [3, [[4]]]]); - * // => [1, 2, 3, 4]; - * - * _.flatten([1, [2], [3, [[4]]]], true); - * // => [1, 2, 3, [[4]]]; - * - * var stooges = [ - * { 'name': 'curly', 'quotes': ['Oh, a wise guy, eh?', 'Poifect!'] }, - * { 'name': 'moe', 'quotes': ['Spread out!', 'You knucklehead!'] } - * ]; - * - * // using "_.pluck" callback shorthand - * _.flatten(stooges, 'quotes'); - * // => ['Oh, a wise guy, eh?', 'Poifect!', 'Spread out!', 'You knucklehead!'] - */ - var flatten = overloadWrapper(function flatten(array, isShallow, callback) { - var index = -1, - length = array ? array.length : 0, - result = []; - - while (++index < length) { - var value = array[index]; - if (callback) { - value = callback(value, index, array); - } - // recursively flatten arrays (susceptible to call stack limits) - if (isArray(value)) { - push.apply(result, isShallow ? value : flatten(value)); - } else { - result.push(value); - } - } - return result; - }); - - /** - * Gets the index at which the first occurrence of `value` is found using - * strict equality for comparisons, i.e. `===`. If the `array` is already - * sorted, passing `true` for `fromIndex` will run a faster binary search. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} array The array to search. - * @param {Mixed} value The value to search for. - * @param {Boolean|Number} [fromIndex=0] The index to search from or `true` to - * perform a binary search on a sorted `array`. - * @returns {Number} Returns the index of the matched value or `-1`. - * @example - * - * _.indexOf([1, 2, 3, 1, 2, 3], 2); - * // => 1 - * - * _.indexOf([1, 2, 3, 1, 2, 3], 2, 3); - * // => 4 - * - * _.indexOf([1, 1, 2, 2, 3, 3], 2, true); - * // => 2 - */ - function indexOf(array, value, fromIndex) { - if (typeof fromIndex == 'number') { - var length = array ? array.length : 0; - fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0); - } else if (fromIndex) { - var index = sortedIndex(array, value); - return array[index] === value ? index : -1; - } - return array ? basicIndexOf(array, value, fromIndex) : -1; - } - - /** - * Gets all but the last element of `array`. If a number `n` is passed, the - * last `n` elements are excluded from the result. If a `callback` function - * is passed, elements at the end of the array are excluded from the result - * as long as the `callback` returns truthy. The `callback` is bound to - * `thisArg` and invoked with three arguments; (value, index, array). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} array The array to query. - * @param {Function|Object|Number|String} [callback|n=1] The function called - * per element or the number of elements to exclude. If a property name or - * object is passed, it will be used to create a "_.pluck" or "_.where" - * style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array} Returns a slice of `array`. - * @example - * - * _.initial([1, 2, 3]); - * // => [1, 2] - * - * _.initial([1, 2, 3], 2); - * // => [1] - * - * _.initial([1, 2, 3], function(num) { - * return num > 1; - * }); - * // => [1] - * - * var food = [ - * { 'name': 'beet', 'organic': false }, - * { 'name': 'carrot', 'organic': true } - * ]; - * - * // using "_.pluck" callback shorthand - * _.initial(food, 'organic'); - * // => [{ 'name': 'beet', 'organic': false }] - * - * var food = [ - * { 'name': 'banana', 'type': 'fruit' }, - * { 'name': 'beet', 'type': 'vegetable' }, - * { 'name': 'carrot', 'type': 'vegetable' } - * ]; - * - * // using "_.where" callback shorthand - * _.initial(food, { 'type': 'vegetable' }); - * // => [{ 'name': 'banana', 'type': 'fruit' }] - */ - function initial(array, callback, thisArg) { - if (!array) { - return []; - } - var n = 0, - length = array.length; - - if (typeof callback != 'number' && callback != null) { - var index = length; - callback = lodash.createCallback(callback, thisArg); - while (index-- && callback(array[index], index, array)) { - n++; - } - } else { - n = (callback == null || thisArg) ? 1 : callback || n; - } - return slice(array, 0, nativeMin(nativeMax(0, length - n), length)); - } - - /** - * Computes the intersection of all the passed-in arrays using strict equality - * for comparisons, i.e. `===`. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} [array1, array2, ...] Arrays to process. - * @returns {Array} Returns a new array of unique elements that are present - * in **all** of the arrays. - * @example - * - * _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]); - * // => [1, 2] - */ - function intersection(array) { - var args = arguments, - argsLength = args.length, - argsIndex = -1, - caches = getArray(), - index = -1, - indexOf = getIndexOf(), - length = array ? array.length : 0, - result = [], - seen = getArray(); - - while (++argsIndex < argsLength) { - var value = args[argsIndex]; - caches[argsIndex] = indexOf === basicIndexOf && - (value ? value.length : 0) >= largeArraySize && - createCache(argsIndex ? args[argsIndex] : seen); - } - outer: - while (++index < length) { - var cache = caches[0]; - value = array[index]; - - if ((cache ? cacheIndexOf(cache, value) : indexOf(seen, value)) < 0) { - argsIndex = argsLength; - (cache || seen).push(value); - while (--argsIndex) { - cache = caches[argsIndex]; - if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value)) < 0) { - continue outer; - } - } - result.push(value); - } - } - while (argsLength--) { - cache = caches[argsLength]; - if (cache) { - releaseObject(cache); - } - } - releaseArray(caches); - releaseArray(seen); - return result; - } - - /** - * Gets the last element of the `array`. If a number `n` is passed, the - * last `n` elements of the `array` are returned. If a `callback` function - * is passed, elements at the end of the array are returned as long as the - * `callback` returns truthy. The `callback` is bound to `thisArg` and - * invoked with three arguments;(value, index, array). - * - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} array The array to query. - * @param {Function|Object|Number|String} [callback|n] The function called - * per element or the number of elements to return. If a property name or - * object is passed, it will be used to create a "_.pluck" or "_.where" - * style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Mixed} Returns the last element(s) of `array`. - * @example - * - * _.last([1, 2, 3]); - * // => 3 - * - * _.last([1, 2, 3], 2); - * // => [2, 3] - * - * _.last([1, 2, 3], function(num) { - * return num > 1; - * }); - * // => [2, 3] - * - * var food = [ - * { 'name': 'beet', 'organic': false }, - * { 'name': 'carrot', 'organic': true } - * ]; - * - * // using "_.pluck" callback shorthand - * _.last(food, 'organic'); - * // => [{ 'name': 'carrot', 'organic': true }] - * - * var food = [ - * { 'name': 'banana', 'type': 'fruit' }, - * { 'name': 'beet', 'type': 'vegetable' }, - * { 'name': 'carrot', 'type': 'vegetable' } - * ]; - * - * // using "_.where" callback shorthand - * _.last(food, { 'type': 'vegetable' }); - * // => [{ 'name': 'beet', 'type': 'vegetable' }, { 'name': 'carrot', 'type': 'vegetable' }] - */ - function last(array, callback, thisArg) { - if (array) { - var n = 0, - length = array.length; - - if (typeof callback != 'number' && callback != null) { - var index = length; - callback = lodash.createCallback(callback, thisArg); - while (index-- && callback(array[index], index, array)) { - n++; - } - } else { - n = callback; - if (n == null || thisArg) { - return array[length - 1]; - } - } - return slice(array, nativeMax(0, length - n)); - } - } - - /** - * Gets the index at which the last occurrence of `value` is found using strict - * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used - * as the offset from the end of the collection. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} array The array to search. - * @param {Mixed} value The value to search for. - * @param {Number} [fromIndex=array.length-1] The index to search from. - * @returns {Number} Returns the index of the matched value or `-1`. - * @example - * - * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2); - * // => 4 - * - * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3); - * // => 1 - */ - function lastIndexOf(array, value, fromIndex) { - var index = array ? array.length : 0; - if (typeof fromIndex == 'number') { - index = (fromIndex < 0 ? nativeMax(0, index + fromIndex) : nativeMin(fromIndex, index - 1)) + 1; - } - while (index--) { - if (array[index] === value) { - return index; - } - } - return -1; - } - - /** - * Creates an array of numbers (positive and/or negative) progressing from - * `start` up to but not including `end`. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Number} [start=0] The start of the range. - * @param {Number} end The end of the range. - * @param {Number} [step=1] The value to increment or decrement by. - * @returns {Array} Returns a new range array. - * @example - * - * _.range(10); - * // => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] - * - * _.range(1, 11); - * // => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] - * - * _.range(0, 30, 5); - * // => [0, 5, 10, 15, 20, 25] - * - * _.range(0, -10, -1); - * // => [0, -1, -2, -3, -4, -5, -6, -7, -8, -9] - * - * _.range(0); - * // => [] - */ - function range(start, end, step) { - start = +start || 0; - step = +step || 1; - - if (end == null) { - end = start; - start = 0; - } - // use `Array(length)` so V8 will avoid the slower "dictionary" mode - // http://youtu.be/XAqIpGU8ZZk#t=17m25s - var index = -1, - length = nativeMax(0, ceil((end - start) / step)), - result = Array(length); - - while (++index < length) { - result[index] = start; - start += step; - } - return result; - } - - /** - * The opposite of `_.initial`, this method gets all but the first value of - * `array`. If a number `n` is passed, the first `n` values are excluded from - * the result. If a `callback` function is passed, elements at the beginning - * of the array are excluded from the result as long as the `callback` returns - * truthy. The `callback` is bound to `thisArg` and invoked with three - * arguments; (value, index, array). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @alias drop, tail - * @category Arrays - * @param {Array} array The array to query. - * @param {Function|Object|Number|String} [callback|n=1] The function called - * per element or the number of elements to exclude. If a property name or - * object is passed, it will be used to create a "_.pluck" or "_.where" - * style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array} Returns a slice of `array`. - * @example - * - * _.rest([1, 2, 3]); - * // => [2, 3] - * - * _.rest([1, 2, 3], 2); - * // => [3] - * - * _.rest([1, 2, 3], function(num) { - * return num < 3; - * }); - * // => [3] - * - * var food = [ - * { 'name': 'banana', 'organic': true }, - * { 'name': 'beet', 'organic': false }, - * ]; - * - * // using "_.pluck" callback shorthand - * _.rest(food, 'organic'); - * // => [{ 'name': 'beet', 'organic': false }] - * - * var food = [ - * { 'name': 'apple', 'type': 'fruit' }, - * { 'name': 'banana', 'type': 'fruit' }, - * { 'name': 'beet', 'type': 'vegetable' } - * ]; - * - * // using "_.where" callback shorthand - * _.rest(food, { 'type': 'fruit' }); - * // => [{ 'name': 'beet', 'type': 'vegetable' }] - */ - function rest(array, callback, thisArg) { - if (typeof callback != 'number' && callback != null) { - var n = 0, - index = -1, - length = array ? array.length : 0; - - callback = lodash.createCallback(callback, thisArg); - while (++index < length && callback(array[index], index, array)) { - n++; - } - } else { - n = (callback == null || thisArg) ? 1 : nativeMax(0, callback); - } - return slice(array, n); - } - - /** - * Uses a binary search to determine the smallest index at which the `value` - * should be inserted into `array` in order to maintain the sort order of the - * sorted `array`. If `callback` is passed, it will be executed for `value` and - * each element in `array` to compute their sort ranking. The `callback` is - * bound to `thisArg` and invoked with one argument; (value). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} array The array to inspect. - * @param {Mixed} value The value to evaluate. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Number} Returns the index at which the value should be inserted - * into `array`. - * @example - * - * _.sortedIndex([20, 30, 50], 40); - * // => 2 - * - * // using "_.pluck" callback shorthand - * _.sortedIndex([{ 'x': 20 }, { 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x'); - * // => 2 - * - * var dict = { - * 'wordToNumber': { 'twenty': 20, 'thirty': 30, 'fourty': 40, 'fifty': 50 } - * }; - * - * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) { - * return dict.wordToNumber[word]; - * }); - * // => 2 - * - * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) { - * return this.wordToNumber[word]; - * }, dict); - * // => 2 - */ - function sortedIndex(array, value, callback, thisArg) { - var low = 0, - high = array ? array.length : low; - - // explicitly reference `identity` for better inlining in Firefox - callback = callback ? lodash.createCallback(callback, thisArg, 1) : identity; - value = callback(value); - - while (low < high) { - var mid = (low + high) >>> 1; - (callback(array[mid]) < value) - ? low = mid + 1 - : high = mid; - } - return low; - } - - /** - * Computes the union of the passed-in arrays using strict equality for - * comparisons, i.e. `===`. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} [array1, array2, ...] Arrays to process. - * @returns {Array} Returns a new array of unique values, in order, that are - * present in one or more of the arrays. - * @example - * - * _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]); - * // => [1, 2, 3, 101, 10] - */ - function union(array) { - if (!isArray(array)) { - arguments[0] = array ? nativeSlice.call(array) : arrayRef; - } - return uniq(concat.apply(arrayRef, arguments)); - } - - /** - * Creates a duplicate-value-free version of the `array` using strict equality - * for comparisons, i.e. `===`. If the `array` is already sorted, passing `true` - * for `isSorted` will run a faster algorithm. If `callback` is passed, each - * element of `array` is passed through the `callback` before uniqueness is computed. - * The `callback` is bound to `thisArg` and invoked with three arguments; (value, index, array). - * - * If a property name is passed for `callback`, the created "_.pluck" style - * callback will return the property value of the given element. - * - * If an object is passed for `callback`, the created "_.where" style callback - * will return `true` for elements that have the properties of the given object, - * else `false`. - * - * @static - * @memberOf _ - * @alias unique - * @category Arrays - * @param {Array} array The array to process. - * @param {Boolean} [isSorted=false] A flag to indicate that the `array` is already sorted. - * @param {Function|Object|String} [callback=identity] The function called per - * iteration. If a property name or object is passed, it will be used to create - * a "_.pluck" or "_.where" style callback, respectively. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array} Returns a duplicate-value-free array. - * @example - * - * _.uniq([1, 2, 1, 3, 1]); - * // => [1, 2, 3] - * - * _.uniq([1, 1, 2, 2, 3], true); - * // => [1, 2, 3] - * - * _.uniq(['A', 'b', 'C', 'a', 'B', 'c'], function(letter) { return letter.toLowerCase(); }); - * // => ['A', 'b', 'C'] - * - * _.uniq([1, 2.5, 3, 1.5, 2, 3.5], function(num) { return this.floor(num); }, Math); - * // => [1, 2.5, 3] - * - * // using "_.pluck" callback shorthand - * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x'); - * // => [{ 'x': 1 }, { 'x': 2 }] - */ - var uniq = overloadWrapper(function(array, isSorted, callback) { - var index = -1, - indexOf = getIndexOf(), - length = array ? array.length : 0, - result = []; - - var isLarge = !isSorted && length >= largeArraySize && indexOf === basicIndexOf, - seen = (callback || isLarge) ? getArray() : result; - - if (isLarge) { - var cache = createCache(seen); - if (cache) { - indexOf = cacheIndexOf; - seen = cache; - } else { - isLarge = false; - seen = callback ? seen : (releaseArray(seen), result); - } - } - while (++index < length) { - var value = array[index], - computed = callback ? callback(value, index, array) : value; - - if (isSorted - ? !index || seen[seen.length - 1] !== computed - : indexOf(seen, computed) < 0 - ) { - if (callback || isLarge) { - seen.push(computed); - } - result.push(value); - } - } - if (isLarge) { - releaseArray(seen.array); - releaseObject(seen); - } else if (callback) { - releaseArray(seen); - } - return result; - }); - - /** - * The inverse of `_.zip`, this method splits groups of elements into arrays - * composed of elements from each group at their corresponding indexes. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} array The array to process. - * @returns {Array} Returns a new array of the composed arrays. - * @example - * - * _.unzip([['moe', 30, true], ['larry', 40, false]]); - * // => [['moe', 'larry'], [30, 40], [true, false]]; - */ - function unzip(array) { - var index = -1, - length = array ? max(pluck(array, 'length')) : 0, - result = Array(length < 0 ? 0 : length); - - while (++index < length) { - result[index] = pluck(array, index); - } - return result; - } - - /** - * Creates an array with all occurrences of the passed values removed using - * strict equality for comparisons, i.e. `===`. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} array The array to filter. - * @param {Mixed} [value1, value2, ...] Values to remove. - * @returns {Array} Returns a new filtered array. - * @example - * - * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1); - * // => [2, 3, 4] - */ - function without(array) { - return difference(array, nativeSlice.call(arguments, 1)); - } - - /** - * Groups the elements of each array at their corresponding indexes. Useful for - * separate data sources that are coordinated through matching array indexes. - * For a matrix of nested arrays, `_.zip.apply(...)` can transpose the matrix - * in a similar fashion. - * - * @static - * @memberOf _ - * @category Arrays - * @param {Array} [array1, array2, ...] Arrays to process. - * @returns {Array} Returns a new array of grouped elements. - * @example - * - * _.zip(['moe', 'larry'], [30, 40], [true, false]); - * // => [['moe', 30, true], ['larry', 40, false]] - */ - function zip(array) { - return array ? unzip(arguments) : []; - } - - /** - * Creates an object composed from arrays of `keys` and `values`. Pass either - * a single two dimensional array, i.e. `[[key1, value1], [key2, value2]]`, or - * two arrays, one of `keys` and one of corresponding `values`. - * - * @static - * @memberOf _ - * @alias object - * @category Arrays - * @param {Array} keys The array of keys. - * @param {Array} [values=[]] The array of values. - * @returns {Object} Returns an object composed of the given keys and - * corresponding values. - * @example - * - * _.zipObject(['moe', 'larry'], [30, 40]); - * // => { 'moe': 30, 'larry': 40 } - */ - function zipObject(keys, values) { - var index = -1, - length = keys ? keys.length : 0, - result = {}; - - while (++index < length) { - var key = keys[index]; - if (values) { - result[key] = values[index]; - } else { - result[key[0]] = key[1]; - } - } - return result; - } - - /*--------------------------------------------------------------------------*/ - - /** - * If `n` is greater than `0`, a function is created that is restricted to - * executing `func`, with the `this` binding and arguments of the created - * function, only after it is called `n` times. If `n` is less than `1`, - * `func` is executed immediately, without a `this` binding or additional - * arguments, and its result is returned. - * - * @static - * @memberOf _ - * @category Functions - * @param {Number} n The number of times the function must be called before - * it is executed. - * @param {Function} func The function to restrict. - * @returns {Function} Returns the new restricted function. - * @example - * - * var renderNotes = _.after(notes.length, render); - * _.forEach(notes, function(note) { - * note.asyncSave({ 'success': renderNotes }); - * }); - * // `renderNotes` is run once, after all notes have saved - */ - function after(n, func) { - if (n < 1) { - return func(); - } - return function() { - if (--n < 1) { - return func.apply(this, arguments); - } - }; - } - - /** - * Creates a function that, when called, invokes `func` with the `this` - * binding of `thisArg` and prepends any additional `bind` arguments to those - * passed to the bound function. - * - * @static - * @memberOf _ - * @category Functions - * @param {Function} func The function to bind. - * @param {Mixed} [thisArg] The `this` binding of `func`. - * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied. - * @returns {Function} Returns the new bound function. - * @example - * - * var func = function(greeting) { - * return greeting + ' ' + this.name; - * }; - * - * func = _.bind(func, { 'name': 'moe' }, 'hi'); - * func(); - * // => 'hi moe' - */ - function bind(func, thisArg) { - // use `Function#bind` if it exists and is fast - // (in V8 `Function#bind` is slower except when partially applied) - return support.fastBind || (nativeBind && arguments.length > 2) - ? nativeBind.call.apply(nativeBind, arguments) - : createBound(func, thisArg, nativeSlice.call(arguments, 2)); - } - - /** - * Binds methods on `object` to `object`, overwriting the existing method. - * Method names may be specified as individual arguments or as arrays of method - * names. If no method names are provided, all the function properties of `object` - * will be bound. - * - * @static - * @memberOf _ - * @category Functions - * @param {Object} object The object to bind and assign the bound methods to. - * @param {String} [methodName1, methodName2, ...] Method names on the object to bind. - * @returns {Object} Returns `object`. - * @example - * - * var view = { - * 'label': 'docs', - * 'onClick': function() { alert('clicked ' + this.label); } - * }; - * - * _.bindAll(view); - * jQuery('#docs').on('click', view.onClick); - * // => alerts 'clicked docs', when the button is clicked - */ - function bindAll(object) { - var funcs = arguments.length > 1 ? concat.apply(arrayRef, nativeSlice.call(arguments, 1)) : functions(object), - index = -1, - length = funcs.length; - - while (++index < length) { - var key = funcs[index]; - object[key] = bind(object[key], object); - } return object; + }; + } + + /** + * Creates a function that produces an instance of `Ctor` regardless of + * whether it was invoked as part of a `new` expression or by `call` or `apply`. + * + * @private + * @param {Function} Ctor The constructor to wrap. + * @returns {Function} Returns the new wrapped function. + */ + function createCtor(Ctor) { + return function() { + // Use a `switch` statement to work with class constructors. See + // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist + // for more details. + var args = arguments; + switch (args.length) { + case 0: return new Ctor; + case 1: return new Ctor(args[0]); + case 2: return new Ctor(args[0], args[1]); + case 3: return new Ctor(args[0], args[1], args[2]); + case 4: return new Ctor(args[0], args[1], args[2], args[3]); + case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]); + case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]); + case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]); + } + var thisBinding = baseCreate(Ctor.prototype), + result = Ctor.apply(thisBinding, args); + + // Mimic the constructor's `return` behavior. + // See https://es5.github.io/#x13.2.2 for more details. + return isObject(result) ? result : thisBinding; + }; + } + + /** + * Creates a function that wraps `func` to invoke it with optional `this` + * binding of `thisArg`, partial application, and currying. + * + * @private + * @param {Function|string} func The function or method name to wrap. + * @param {number} bitmask The bitmask flags. See `createWrap` for more details. + * @param {*} [thisArg] The `this` binding of `func`. + * @param {Array} [partials] The arguments to prepend to those provided to + * the new function. + * @param {Array} [holders] The `partials` placeholder indexes. + * @param {Array} [partialsRight] The arguments to append to those provided + * to the new function. + * @param {Array} [holdersRight] The `partialsRight` placeholder indexes. + * @param {Array} [argPos] The argument positions of the new function. + * @param {number} [ary] The arity cap of `func`. + * @param {number} [arity] The arity of `func`. + * @returns {Function} Returns the new wrapped function. + */ + function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) { + var isAry = bitmask & WRAP_ARY_FLAG, + isBind = bitmask & WRAP_BIND_FLAG, + isBindKey = bitmask & WRAP_BIND_KEY_FLAG, + isCurried = bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG), + isFlip = bitmask & WRAP_FLIP_FLAG, + Ctor = isBindKey ? undefined : createCtor(func); + + function wrapper() { + var length = arguments.length, + args = Array(length), + index = length; + + while (index--) { + args[index] = arguments[index]; + } + if (isCurried) { + var placeholder = getHolder(wrapper), + holdersCount = countHolders(args, placeholder); + } + if (partials) { + args = composeArgs(args, partials, holders, isCurried); + } + if (partialsRight) { + args = composeArgsRight(args, partialsRight, holdersRight, isCurried); + } + length -= holdersCount; + if (isCurried && length < arity) { + var newHolders = replaceHolders(args, placeholder); + return createRecurry( + func, bitmask, createHybrid, wrapper.placeholder, thisArg, + args, newHolders, argPos, ary, arity - length + ); + } + var thisBinding = isBind ? thisArg : this, + fn = isBindKey ? thisBinding[func] : func; + + length = args.length; + if (argPos) { + args = reorder(args, argPos); + } else if (isFlip && length > 1) { + args.reverse(); + } + if (isAry && ary < length) { + args.length = ary; + } + if (this && this !== root && this instanceof wrapper) { + fn = Ctor || createCtor(fn); + } + return fn.apply(thisBinding, args); } + return wrapper; + } - /** - * Creates a function that, when called, invokes the method at `object[key]` - * and prepends any additional `bindKey` arguments to those passed to the bound - * function. This method differs from `_.bind` by allowing bound functions to - * reference methods that will be redefined or don't yet exist. - * See http://michaux.ca/articles/lazy-function-definition-pattern. - * - * @static - * @memberOf _ - * @category Functions - * @param {Object} object The object the method belongs to. - * @param {String} key The key of the method. - * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied. - * @returns {Function} Returns the new bound function. - * @example - * - * var object = { - * 'name': 'moe', - * 'greet': function(greeting) { - * return greeting + ' ' + this.name; - * } - * }; - * - * var func = _.bindKey(object, 'greet', 'hi'); - * func(); - * // => 'hi moe' - * - * object.greet = function(greeting) { - * return greeting + ', ' + this.name + '!'; - * }; - * - * func(); - * // => 'hi, moe!' - */ - function bindKey(object, key) { - return createBound(object, key, nativeSlice.call(arguments, 2), indicatorObject); + /** + * Creates a `_.range` or `_.rangeRight` function. + * + * @private + * @param {boolean} [fromRight] Specify iterating from right to left. + * @returns {Function} Returns the new range function. + */ + function createRange(fromRight) { + return function(start, end, step) { + if (step && typeof step != 'number' && isIterateeCall(start, end, step)) { + end = step = undefined; + } + // Ensure the sign of `-0` is preserved. + start = toFinite(start); + if (end === undefined) { + end = start; + start = 0; + } else { + end = toFinite(end); + } + step = step === undefined ? (start < end ? 1 : -1) : toFinite(step); + return baseRange(start, end, step, fromRight); + }; + } + + /** + * Creates a function that wraps `func` to continue currying. + * + * @private + * @param {Function} func The function to wrap. + * @param {number} bitmask The bitmask flags. See `createWrap` for more details. + * @param {Function} wrapFunc The function to create the `func` wrapper. + * @param {*} placeholder The placeholder value. + * @param {*} [thisArg] The `this` binding of `func`. + * @param {Array} [partials] The arguments to prepend to those provided to + * the new function. + * @param {Array} [holders] The `partials` placeholder indexes. + * @param {Array} [argPos] The argument positions of the new function. + * @param {number} [ary] The arity cap of `func`. + * @param {number} [arity] The arity of `func`. + * @returns {Function} Returns the new wrapped function. + */ + function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) { + var isCurry = bitmask & WRAP_CURRY_FLAG, + newHolders = isCurry ? holders : undefined, + newHoldersRight = isCurry ? undefined : holders, + newPartials = isCurry ? partials : undefined, + newPartialsRight = isCurry ? undefined : partials; + + bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG); + bitmask &= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG); + + if (!(bitmask & WRAP_CURRY_BOUND_FLAG)) { + bitmask &= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG); } + var newData = [ + func, bitmask, thisArg, newPartials, newHolders, newPartialsRight, + newHoldersRight, argPos, ary, arity + ]; - /** - * Creates a function that is the composition of the passed functions, - * where each function consumes the return value of the function that follows. - * For example, composing the functions `f()`, `g()`, and `h()` produces `f(g(h()))`. - * Each function is executed with the `this` binding of the composed function. - * - * @static - * @memberOf _ - * @category Functions - * @param {Function} [func1, func2, ...] Functions to compose. - * @returns {Function} Returns the new composed function. - * @example - * - * var greet = function(name) { return 'hi ' + name; }; - * var exclaim = function(statement) { return statement + '!'; }; - * var welcome = _.compose(exclaim, greet); - * welcome('moe'); - * // => 'hi moe!' - */ - function compose() { - var funcs = arguments; - return function() { - var args = arguments, - length = funcs.length; - - while (length--) { - args = [funcs[length].apply(this, args)]; - } - return args[0]; - }; + var result = wrapFunc.apply(undefined, newData); + if (isLaziable(func)) { + setData(result, newData); } + result.placeholder = placeholder; + return setWrapToString(result, func, bitmask); + } - /** - * Produces a callback bound to an optional `thisArg`. If `func` is a property - * name, the created callback will return the property value for a given element. - * If `func` is an object, the created callback will return `true` for elements - * that contain the equivalent object properties, otherwise it will return `false`. - * - * Note: All Lo-Dash methods, that accept a `callback` argument, use `_.createCallback`. - * - * @static - * @memberOf _ - * @category Functions - * @param {Mixed} [func=identity] The value to convert to a callback. - * @param {Mixed} [thisArg] The `this` binding of the created callback. - * @param {Number} [argCount=3] The number of arguments the callback accepts. - * @returns {Function} Returns a callback function. - * @example - * - * var stooges = [ - * { 'name': 'moe', 'age': 40 }, - * { 'name': 'larry', 'age': 50 } - * ]; - * - * // wrap to create custom callback shorthands - * _.createCallback = _.wrap(_.createCallback, function(func, callback, thisArg) { - * var match = /^(.+?)__([gl]t)(.+)$/.exec(callback); - * return !match ? func(callback, thisArg) : function(object) { - * return match[2] == 'gt' ? object[match[1]] > match[3] : object[match[1]] < match[3]; - * }; - * }); - * - * _.filter(stooges, 'age__gt45'); - * // => [{ 'name': 'larry', 'age': 50 }] - * - * // create mixins with support for "_.pluck" and "_.where" callback shorthands - * _.mixin({ - * 'toLookup': function(collection, callback, thisArg) { - * callback = _.createCallback(callback, thisArg); - * return _.reduce(collection, function(result, value, index, collection) { - * return (result[callback(value, index, collection)] = value, result); - * }, {}); - * } - * }); - * - * _.toLookup(stooges, 'name'); - * // => { 'moe': { 'name': 'moe', 'age': 40 }, 'larry': { 'name': 'larry', 'age': 50 } } - */ - function createCallback(func, thisArg, argCount) { - if (func == null) { - return identity; - } - var type = typeof func; - if (type != 'function') { - if (type != 'object') { - return function(object) { - return object[func]; - }; - } - var props = keys(func); - return function(object) { - var length = props.length, - result = false; - while (length--) { - if (!(result = isEqual(object[props[length]], func[props[length]], indicatorObject))) { - break; - } - } - return result; - }; - } - if (typeof thisArg == 'undefined' || (reThis && !reThis.test(fnToString.call(func)))) { - return func; - } - if (argCount === 1) { - return function(value) { - return func.call(thisArg, value); - }; - } - if (argCount === 2) { - return function(a, b) { - return func.call(thisArg, a, b); - }; - } - if (argCount === 4) { - return function(accumulator, value, index, collection) { - return func.call(thisArg, accumulator, value, index, collection); - }; - } - return function(value, index, collection) { - return func.call(thisArg, value, index, collection); - }; + /** + * Creates a set object of `values`. + * + * @private + * @param {Array} values The values to add to the set. + * @returns {Object} Returns the new set. + */ + var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) { + return new Set(values); + }; + + /** + * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain + * objects. + * + * @private + * @param {*} value The value to inspect. + * @param {string} key The key of the property to inspect. + * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`. + */ + function customOmitClone(value) { + return isPlainObject(value) ? undefined : value; + } + + /** + * A specialized version of `baseIsEqualDeep` for arrays with support for + * partial deep comparisons. + * + * @private + * @param {Array} array The array to compare. + * @param {Array} other The other array to compare. + * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details. + * @param {Function} customizer The function to customize comparisons. + * @param {Function} equalFunc The function to determine equivalents of values. + * @param {Object} stack Tracks traversed `array` and `other` objects. + * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`. + */ + function equalArrays(array, other, bitmask, customizer, equalFunc, stack) { + var isPartial = bitmask & COMPARE_PARTIAL_FLAG, + arrLength = array.length, + othLength = other.length; + + if (arrLength != othLength && !(isPartial && othLength > arrLength)) { + return false; } + // Assume cyclic values are equal. + var stacked = stack.get(array); + if (stacked && stack.get(other)) { + return stacked == other; + } + var index = -1, + result = true, + seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined; - /** - * Creates a function that will delay the execution of `func` until after - * `wait` milliseconds have elapsed since the last time it was invoked. Pass - * an `options` object to indicate that `func` should be invoked on the leading - * and/or trailing edge of the `wait` timeout. Subsequent calls to the debounced - * function will return the result of the last `func` call. - * - * Note: If `leading` and `trailing` options are `true`, `func` will be called - * on the trailing edge of the timeout only if the the debounced function is - * invoked more than once during the `wait` timeout. - * - * @static - * @memberOf _ - * @category Functions - * @param {Function} func The function to debounce. - * @param {Number} wait The number of milliseconds to delay. - * @param {Object} options The options object. - * [leading=false] A boolean to specify execution on the leading edge of the timeout. - * [maxWait] The maximum time `func` is allowed to be delayed before it's called. - * [trailing=true] A boolean to specify execution on the trailing edge of the timeout. - * @returns {Function} Returns the new debounced function. - * @example - * - * var lazyLayout = _.debounce(calculateLayout, 300); - * jQuery(window).on('resize', lazyLayout); - * - * jQuery('#postbox').on('click', _.debounce(sendMail, 200, { - * 'leading': true, - * 'trailing': false - * }); - */ - function debounce(func, wait, options) { - var args, - result, - thisArg, - callCount = 0, - lastCalled = 0, - maxWait = false, - maxTimeoutId = null, - timeoutId = null, - trailing = true; + stack.set(array, other); + stack.set(other, array); - function clear() { - clearTimeout(maxTimeoutId); - clearTimeout(timeoutId); - callCount = 0; - maxTimeoutId = timeoutId = null; + // Ignore non-index properties. + while (++index < arrLength) { + var arrValue = array[index], + othValue = other[index]; + + if (customizer) { + var compared = isPartial + ? customizer(othValue, arrValue, index, other, array, stack) + : customizer(arrValue, othValue, index, array, other, stack); } - - function delayed() { - var isCalled = trailing && (!leading || callCount > 1); - clear(); - if (isCalled) { - if (maxWait !== false) { - lastCalled = new Date; - } - result = func.apply(thisArg, args); + if (compared !== undefined) { + if (compared) { + continue; } + result = false; + break; } - - function maxDelayed() { - clear(); - if (trailing || (maxWait !== wait)) { - lastCalled = new Date; - result = func.apply(thisArg, args); + // Recursively compare arrays (susceptible to call stack limits). + if (seen) { + if (!arraySome(other, function(othValue, othIndex) { + if (!cacheHas(seen, othIndex) && + (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) { + return seen.push(othIndex); + } + })) { + result = false; + break; } + } else if (!( + arrValue === othValue || + equalFunc(arrValue, othValue, bitmask, customizer, stack) + )) { + result = false; + break; } + } + stack['delete'](array); + stack['delete'](other); + return result; + } - wait = nativeMax(0, wait || 0); - if (options === true) { - var leading = true; - trailing = false; - } else if (isObject(options)) { - leading = options.leading; - maxWait = 'maxWait' in options && nativeMax(wait, options.maxWait || 0); - trailing = 'trailing' in options ? options.trailing : trailing; - } - return function() { - args = arguments; - thisArg = this; - callCount++; - - // avoid issues with Titanium and `undefined` timeout ids - // https://github.com/appcelerator/titanium_mobile/blob/3_1_0_GA/android/titanium/src/java/ti/modules/titanium/TitaniumModule.java#L185-L192 - clearTimeout(timeoutId); - - if (maxWait === false) { - if (leading && callCount < 2) { - result = func.apply(thisArg, args); - } - } else { - var now = new Date; - if (!maxTimeoutId && !leading) { - lastCalled = now; - } - var remaining = maxWait - (now - lastCalled); - if (remaining <= 0) { - clearTimeout(maxTimeoutId); - maxTimeoutId = null; - lastCalled = now; - result = func.apply(thisArg, args); - } - else if (!maxTimeoutId) { - maxTimeoutId = setTimeout(maxDelayed, remaining); - } + /** + * A specialized version of `baseIsEqualDeep` for comparing objects of + * the same `toStringTag`. + * + * **Note:** This function only supports comparing values with tags of + * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`. + * + * @private + * @param {Object} object The object to compare. + * @param {Object} other The other object to compare. + * @param {string} tag The `toStringTag` of the objects to compare. + * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details. + * @param {Function} customizer The function to customize comparisons. + * @param {Function} equalFunc The function to determine equivalents of values. + * @param {Object} stack Tracks traversed `object` and `other` objects. + * @returns {boolean} Returns `true` if the objects are equivalent, else `false`. + */ + function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) { + switch (tag) { + case dataViewTag: + if ((object.byteLength != other.byteLength) || + (object.byteOffset != other.byteOffset)) { + return false; } - if (wait !== maxWait) { - timeoutId = setTimeout(delayed, wait); + object = object.buffer; + other = other.buffer; + + case arrayBufferTag: + if ((object.byteLength != other.byteLength) || + !equalFunc(new Uint8Array(object), new Uint8Array(other))) { + return false; } + return true; + + case boolTag: + case dateTag: + case numberTag: + // Coerce booleans to `1` or `0` and dates to milliseconds. + // Invalid dates are coerced to `NaN`. + return eq(+object, +other); + + case errorTag: + return object.name == other.name && object.message == other.message; + + case regexpTag: + case stringTag: + // Coerce regexes to strings and treat strings, primitives and objects, + // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring + // for more details. + return object == (other + ''); + + case mapTag: + var convert = mapToArray; + + case setTag: + var isPartial = bitmask & COMPARE_PARTIAL_FLAG; + convert || (convert = setToArray); + + if (object.size != other.size && !isPartial) { + return false; + } + // Assume cyclic values are equal. + var stacked = stack.get(object); + if (stacked) { + return stacked == other; + } + bitmask |= COMPARE_UNORDERED_FLAG; + + // Recursively compare objects (susceptible to call stack limits). + stack.set(object, other); + var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack); + stack['delete'](object); return result; - }; - } - /** - * Defers executing the `func` function until the current call stack has cleared. - * Additional arguments will be passed to `func` when it is invoked. - * - * @static - * @memberOf _ - * @category Functions - * @param {Function} func The function to defer. - * @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with. - * @returns {Number} Returns the timer id. - * @example - * - * _.defer(function() { alert('deferred'); }); - * // returns from the function before `alert` is called - */ - function defer(func) { - var args = nativeSlice.call(arguments, 1); - return setTimeout(function() { func.apply(undefined, args); }, 1); - } - // use `setImmediate` if it's available in Node.js - if (isV8 && freeModule && typeof setImmediate == 'function') { - defer = bind(setImmediate, context); - } - - /** - * Executes the `func` function after `wait` milliseconds. Additional arguments - * will be passed to `func` when it is invoked. - * - * @static - * @memberOf _ - * @category Functions - * @param {Function} func The function to delay. - * @param {Number} wait The number of milliseconds to delay execution. - * @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with. - * @returns {Number} Returns the timer id. - * @example - * - * var log = _.bind(console.log, console); - * _.delay(log, 1000, 'logged later'); - * // => 'logged later' (Appears after one second.) - */ - function delay(func, wait) { - var args = nativeSlice.call(arguments, 2); - return setTimeout(function() { func.apply(undefined, args); }, wait); - } - - /** - * Creates a function that memoizes the result of `func`. If `resolver` is - * passed, it will be used to determine the cache key for storing the result - * based on the arguments passed to the memoized function. By default, the first - * argument passed to the memoized function is used as the cache key. The `func` - * is executed with the `this` binding of the memoized function. The result - * cache is exposed as the `cache` property on the memoized function. - * - * @static - * @memberOf _ - * @category Functions - * @param {Function} func The function to have its output memoized. - * @param {Function} [resolver] A function used to resolve the cache key. - * @returns {Function} Returns the new memoizing function. - * @example - * - * var fibonacci = _.memoize(function(n) { - * return n < 2 ? n : fibonacci(n - 1) + fibonacci(n - 2); - * }); - */ - function memoize(func, resolver) { - function memoized() { - var cache = memoized.cache, - key = keyPrefix + (resolver ? resolver.apply(this, arguments) : arguments[0]); - - return hasOwnProperty.call(cache, key) - ? cache[key] - : (cache[key] = func.apply(this, arguments)); - } - memoized.cache = {}; - return memoized; - } - - /** - * Creates a function that is restricted to execute `func` once. Repeat calls to - * the function will return the value of the first call. The `func` is executed - * with the `this` binding of the created function. - * - * @static - * @memberOf _ - * @category Functions - * @param {Function} func The function to restrict. - * @returns {Function} Returns the new restricted function. - * @example - * - * var initialize = _.once(createApplication); - * initialize(); - * initialize(); - * // `initialize` executes `createApplication` once - */ - function once(func) { - var ran, - result; - - return function() { - if (ran) { - return result; + case symbolTag: + if (symbolValueOf) { + return symbolValueOf.call(object) == symbolValueOf.call(other); } - ran = true; - result = func.apply(this, arguments); - - // clear the `func` variable so the function may be garbage collected - func = null; - return result; - }; } + return false; + } - /** - * Creates a function that, when called, invokes `func` with any additional - * `partial` arguments prepended to those passed to the new function. This - * method is similar to `_.bind`, except it does **not** alter the `this` binding. - * - * @static - * @memberOf _ - * @category Functions - * @param {Function} func The function to partially apply arguments to. - * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied. - * @returns {Function} Returns the new partially applied function. - * @example - * - * var greet = function(greeting, name) { return greeting + ' ' + name; }; - * var hi = _.partial(greet, 'hi'); - * hi('moe'); - * // => 'hi moe' - */ - function partial(func) { - return createBound(func, nativeSlice.call(arguments, 1)); + /** + * A specialized version of `baseIsEqualDeep` for objects with support for + * partial deep comparisons. + * + * @private + * @param {Object} object The object to compare. + * @param {Object} other The other object to compare. + * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details. + * @param {Function} customizer The function to customize comparisons. + * @param {Function} equalFunc The function to determine equivalents of values. + * @param {Object} stack Tracks traversed `object` and `other` objects. + * @returns {boolean} Returns `true` if the objects are equivalent, else `false`. + */ + function equalObjects(object, other, bitmask, customizer, equalFunc, stack) { + var isPartial = bitmask & COMPARE_PARTIAL_FLAG, + objProps = getAllKeys(object), + objLength = objProps.length, + othProps = getAllKeys(other), + othLength = othProps.length; + + if (objLength != othLength && !isPartial) { + return false; } - - /** - * This method is similar to `_.partial`, except that `partial` arguments are - * appended to those passed to the new function. - * - * @static - * @memberOf _ - * @category Functions - * @param {Function} func The function to partially apply arguments to. - * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied. - * @returns {Function} Returns the new partially applied function. - * @example - * - * var defaultsDeep = _.partialRight(_.merge, _.defaults); - * - * var options = { - * 'variable': 'data', - * 'imports': { 'jq': $ } - * }; - * - * defaultsDeep(options, _.templateSettings); - * - * options.variable - * // => 'data' - * - * options.imports - * // => { '_': _, 'jq': $ } - */ - function partialRight(func) { - return createBound(func, nativeSlice.call(arguments, 1), null, indicatorObject); - } - - /** - * Creates a function that, when executed, will only call the `func` function - * at most once per every `wait` milliseconds. Pass an `options` object to - * indicate that `func` should be invoked on the leading and/or trailing edge - * of the `wait` timeout. Subsequent calls to the throttled function will - * return the result of the last `func` call. - * - * Note: If `leading` and `trailing` options are `true`, `func` will be called - * on the trailing edge of the timeout only if the the throttled function is - * invoked more than once during the `wait` timeout. - * - * @static - * @memberOf _ - * @category Functions - * @param {Function} func The function to throttle. - * @param {Number} wait The number of milliseconds to throttle executions to. - * @param {Object} options The options object. - * [leading=true] A boolean to specify execution on the leading edge of the timeout. - * [trailing=true] A boolean to specify execution on the trailing edge of the timeout. - * @returns {Function} Returns the new throttled function. - * @example - * - * var throttled = _.throttle(updatePosition, 100); - * jQuery(window).on('scroll', throttled); - * - * jQuery('.interactive').on('click', _.throttle(renewToken, 300000, { - * 'trailing': false - * })); - */ - function throttle(func, wait, options) { - var leading = true, - trailing = true; - - if (options === false) { - leading = false; - } else if (isObject(options)) { - leading = 'leading' in options ? options.leading : leading; - trailing = 'trailing' in options ? options.trailing : trailing; + var index = objLength; + while (index--) { + var key = objProps[index]; + if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) { + return false; } - options = getObject(); - options.leading = leading; - options.maxWait = wait; - options.trailing = trailing; + } + // Assume cyclic values are equal. + var stacked = stack.get(object); + if (stacked && stack.get(other)) { + return stacked == other; + } + var result = true; + stack.set(object, other); + stack.set(other, object); - var result = debounce(func, wait, options); - releaseObject(options); + var skipCtor = isPartial; + while (++index < objLength) { + key = objProps[index]; + var objValue = object[key], + othValue = other[key]; + + if (customizer) { + var compared = isPartial + ? customizer(othValue, objValue, key, other, object, stack) + : customizer(objValue, othValue, key, object, other, stack); + } + // Recursively compare objects (susceptible to call stack limits). + if (!(compared === undefined + ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack)) + : compared + )) { + result = false; + break; + } + skipCtor || (skipCtor = key == 'constructor'); + } + if (result && !skipCtor) { + var objCtor = object.constructor, + othCtor = other.constructor; + + // Non `Object` object instances with different constructors are not equal. + if (objCtor != othCtor && + ('constructor' in object && 'constructor' in other) && + !(typeof objCtor == 'function' && objCtor instanceof objCtor && + typeof othCtor == 'function' && othCtor instanceof othCtor)) { + result = false; + } + } + stack['delete'](object); + stack['delete'](other); + return result; + } + + /** + * A specialized version of `baseRest` which flattens the rest array. + * + * @private + * @param {Function} func The function to apply a rest parameter to. + * @returns {Function} Returns the new function. + */ + function flatRest(func) { + return setToString(overRest(func, undefined, flatten), func + ''); + } + + /** + * Creates an array of own enumerable property names and symbols of `object`. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names and symbols. + */ + function getAllKeys(object) { + return baseGetAllKeys(object, keys, getSymbols); + } + + /** + * Creates an array of own and inherited enumerable property names and + * symbols of `object`. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names and symbols. + */ + function getAllKeysIn(object) { + return baseGetAllKeys(object, keysIn, getSymbolsIn); + } + + /** + * Gets metadata for `func`. + * + * @private + * @param {Function} func The function to query. + * @returns {*} Returns the metadata for `func`. + */ + var getData = !metaMap ? noop : function(func) { + return metaMap.get(func); + }; + + /** + * Gets the name of `func`. + * + * @private + * @param {Function} func The function to query. + * @returns {string} Returns the function name. + */ + function getFuncName(func) { + var result = (func.name + ''), + array = realNames[result], + length = hasOwnProperty.call(realNames, result) ? array.length : 0; + + while (length--) { + var data = array[length], + otherFunc = data.func; + if (otherFunc == null || otherFunc == func) { + return data.name; + } + } + return result; + } + + /** + * Gets the argument placeholder value for `func`. + * + * @private + * @param {Function} func The function to inspect. + * @returns {*} Returns the placeholder value. + */ + function getHolder(func) { + var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func; + return object.placeholder; + } + + /** + * Gets the appropriate "iteratee" function. If `_.iteratee` is customized, + * this function returns the custom method, otherwise it returns `baseIteratee`. + * If arguments are provided, the chosen function is invoked with them and + * its result is returned. + * + * @private + * @param {*} [value] The value to convert to an iteratee. + * @param {number} [arity] The arity of the created iteratee. + * @returns {Function} Returns the chosen function or its result. + */ + function getIteratee() { + var result = lodash.iteratee || iteratee; + result = result === iteratee ? baseIteratee : result; + return arguments.length ? result(arguments[0], arguments[1]) : result; + } + + /** + * Gets the data for `map`. + * + * @private + * @param {Object} map The map to query. + * @param {string} key The reference key. + * @returns {*} Returns the map data. + */ + function getMapData(map, key) { + var data = map.__data__; + return isKeyable(key) + ? data[typeof key == 'string' ? 'string' : 'hash'] + : data.map; + } + + /** + * Gets the property names, values, and compare flags of `object`. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the match data of `object`. + */ + function getMatchData(object) { + var result = keys(object), + length = result.length; + + while (length--) { + var key = result[length], + value = object[key]; + + result[length] = [key, value, isStrictComparable(value)]; + } + return result; + } + + /** + * Gets the native function at `key` of `object`. + * + * @private + * @param {Object} object The object to query. + * @param {string} key The key of the method to get. + * @returns {*} Returns the function if it's native, else `undefined`. + */ + function getNative(object, key) { + var value = getValue(object, key); + return baseIsNative(value) ? value : undefined; + } + + /** + * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values. + * + * @private + * @param {*} value The value to query. + * @returns {string} Returns the raw `toStringTag`. + */ + function getRawTag(value) { + var isOwn = hasOwnProperty.call(value, symToStringTag), + tag = value[symToStringTag]; + + try { + value[symToStringTag] = undefined; + var unmasked = true; + } catch (e) {} + + var result = nativeObjectToString.call(value); + if (unmasked) { + if (isOwn) { + value[symToStringTag] = tag; + } else { + delete value[symToStringTag]; + } + } + return result; + } + + /** + * Creates an array of the own enumerable symbols of `object`. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of symbols. + */ + var getSymbols = !nativeGetSymbols ? stubArray : function(object) { + if (object == null) { + return []; + } + object = Object(object); + return arrayFilter(nativeGetSymbols(object), function(symbol) { + return propertyIsEnumerable.call(object, symbol); + }); + }; + + /** + * Creates an array of the own and inherited enumerable symbols of `object`. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of symbols. + */ + var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) { + var result = []; + while (object) { + arrayPush(result, getSymbols(object)); + object = getPrototype(object); + } + return result; + }; + + /** + * Gets the `toStringTag` of `value`. + * + * @private + * @param {*} value The value to query. + * @returns {string} Returns the `toStringTag`. + */ + var getTag = baseGetTag; + + // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6. + if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) || + (Map && getTag(new Map) != mapTag) || + (Promise && getTag(Promise.resolve()) != promiseTag) || + (Set && getTag(new Set) != setTag) || + (WeakMap && getTag(new WeakMap) != weakMapTag)) { + getTag = function(value) { + var result = baseGetTag(value), + Ctor = result == objectTag ? value.constructor : undefined, + ctorString = Ctor ? toSource(Ctor) : ''; + + if (ctorString) { + switch (ctorString) { + case dataViewCtorString: return dataViewTag; + case mapCtorString: return mapTag; + case promiseCtorString: return promiseTag; + case setCtorString: return setTag; + case weakMapCtorString: return weakMapTag; + } + } + return result; + }; + } + + /** + * Gets the view, applying any `transforms` to the `start` and `end` positions. + * + * @private + * @param {number} start The start of the view. + * @param {number} end The end of the view. + * @param {Array} transforms The transformations to apply to the view. + * @returns {Object} Returns an object containing the `start` and `end` + * positions of the view. + */ + function getView(start, end, transforms) { + var index = -1, + length = transforms.length; + + while (++index < length) { + var data = transforms[index], + size = data.size; + + switch (data.type) { + case 'drop': start += size; break; + case 'dropRight': end -= size; break; + case 'take': end = nativeMin(end, start + size); break; + case 'takeRight': start = nativeMax(start, end - size); break; + } + } + return { 'start': start, 'end': end }; + } + + /** + * Extracts wrapper details from the `source` body comment. + * + * @private + * @param {string} source The source to inspect. + * @returns {Array} Returns the wrapper details. + */ + function getWrapDetails(source) { + var match = source.match(reWrapDetails); + return match ? match[1].split(reSplitDetails) : []; + } + + /** + * Checks if `path` exists on `object`. + * + * @private + * @param {Object} object The object to query. + * @param {Array|string} path The path to check. + * @param {Function} hasFunc The function to check properties. + * @returns {boolean} Returns `true` if `path` exists, else `false`. + */ + function hasPath(object, path, hasFunc) { + path = castPath(path, object); + + var index = -1, + length = path.length, + result = false; + + while (++index < length) { + var key = toKey(path[index]); + if (!(result = object != null && hasFunc(object, key))) { + break; + } + object = object[key]; + } + if (result || ++index != length) { + return result; + } + length = object == null ? 0 : object.length; + return !!length && isLength(length) && isIndex(key, length) && + (isArray(object) || isArguments(object)); + } + + /** + * Initializes an array clone. + * + * @private + * @param {Array} array The array to clone. + * @returns {Array} Returns the initialized clone. + */ + function initCloneArray(array) { + var length = array.length, + result = new array.constructor(length); + + // Add properties assigned by `RegExp#exec`. + if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) { + result.index = array.index; + result.input = array.input; + } + return result; + } + + /** + * Initializes an object clone. + * + * @private + * @param {Object} object The object to clone. + * @returns {Object} Returns the initialized clone. + */ + function initCloneObject(object) { + return (typeof object.constructor == 'function' && !isPrototype(object)) + ? baseCreate(getPrototype(object)) + : {}; + } + + /** + * Initializes an object clone based on its `toStringTag`. + * + * **Note:** This function only supports cloning values with tags of + * `Boolean`, `Date`, `Error`, `Map`, `Number`, `RegExp`, `Set`, or `String`. + * + * @private + * @param {Object} object The object to clone. + * @param {string} tag The `toStringTag` of the object to clone. + * @param {boolean} [isDeep] Specify a deep clone. + * @returns {Object} Returns the initialized clone. + */ + function initCloneByTag(object, tag, isDeep) { + var Ctor = object.constructor; + switch (tag) { + case arrayBufferTag: + return cloneArrayBuffer(object); + + case boolTag: + case dateTag: + return new Ctor(+object); + + case dataViewTag: + return cloneDataView(object, isDeep); + + case float32Tag: case float64Tag: + case int8Tag: case int16Tag: case int32Tag: + case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag: + return cloneTypedArray(object, isDeep); + + case mapTag: + return new Ctor; + + case numberTag: + case stringTag: + return new Ctor(object); + + case regexpTag: + return cloneRegExp(object); + + case setTag: + return new Ctor; + + case symbolTag: + return cloneSymbol(object); + } + } + + /** + * Inserts wrapper `details` in a comment at the top of the `source` body. + * + * @private + * @param {string} source The source to modify. + * @returns {Array} details The details to insert. + * @returns {string} Returns the modified source. + */ + function insertWrapDetails(source, details) { + var length = details.length; + if (!length) { + return source; + } + var lastIndex = length - 1; + details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex]; + details = details.join(length > 2 ? ', ' : ' '); + return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n'); + } + + /** + * Checks if `value` is a flattenable `arguments` object or array. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is flattenable, else `false`. + */ + function isFlattenable(value) { + return isArray(value) || isArguments(value) || + !!(spreadableSymbol && value && value[spreadableSymbol]); + } + + /** + * Checks if `value` is a valid array-like index. + * + * @private + * @param {*} value The value to check. + * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index. + * @returns {boolean} Returns `true` if `value` is a valid index, else `false`. + */ + function isIndex(value, length) { + var type = typeof value; + length = length == null ? MAX_SAFE_INTEGER : length; + + return !!length && + (type == 'number' || + (type != 'symbol' && reIsUint.test(value))) && + (value > -1 && value % 1 == 0 && value < length); + } + + /** + * Checks if the given arguments are from an iteratee call. + * + * @private + * @param {*} value The potential iteratee value argument. + * @param {*} index The potential iteratee index or key argument. + * @param {*} object The potential iteratee object argument. + * @returns {boolean} Returns `true` if the arguments are from an iteratee call, + * else `false`. + */ + function isIterateeCall(value, index, object) { + if (!isObject(object)) { + return false; + } + var type = typeof index; + if (type == 'number' + ? (isArrayLike(object) && isIndex(index, object.length)) + : (type == 'string' && index in object) + ) { + return eq(object[index], value); + } + return false; + } + + /** + * Checks if `value` is a property name and not a property path. + * + * @private + * @param {*} value The value to check. + * @param {Object} [object] The object to query keys on. + * @returns {boolean} Returns `true` if `value` is a property name, else `false`. + */ + function isKey(value, object) { + if (isArray(value)) { + return false; + } + var type = typeof value; + if (type == 'number' || type == 'symbol' || type == 'boolean' || + value == null || isSymbol(value)) { + return true; + } + return reIsPlainProp.test(value) || !reIsDeepProp.test(value) || + (object != null && value in Object(object)); + } + + /** + * Checks if `value` is suitable for use as unique object key. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is suitable, else `false`. + */ + function isKeyable(value) { + var type = typeof value; + return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean') + ? (value !== '__proto__') + : (value === null); + } + + /** + * Checks if `func` has a lazy counterpart. + * + * @private + * @param {Function} func The function to check. + * @returns {boolean} Returns `true` if `func` has a lazy counterpart, + * else `false`. + */ + function isLaziable(func) { + var funcName = getFuncName(func), + other = lodash[funcName]; + + if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) { + return false; + } + if (func === other) { + return true; + } + var data = getData(other); + return !!data && func === data[0]; + } + + /** + * Checks if `func` has its source masked. + * + * @private + * @param {Function} func The function to check. + * @returns {boolean} Returns `true` if `func` is masked, else `false`. + */ + function isMasked(func) { + return !!maskSrcKey && (maskSrcKey in func); + } + + /** + * Checks if `value` is likely a prototype object. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a prototype, else `false`. + */ + function isPrototype(value) { + var Ctor = value && value.constructor, + proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto; + + return value === proto; + } + + /** + * Checks if `value` is suitable for strict equality comparisons, i.e. `===`. + * + * @private + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` if suitable for strict + * equality comparisons, else `false`. + */ + function isStrictComparable(value) { + return value === value && !isObject(value); + } + + /** + * A specialized version of `matchesProperty` for source values suitable + * for strict equality comparisons, i.e. `===`. + * + * @private + * @param {string} key The key of the property to get. + * @param {*} srcValue The value to match. + * @returns {Function} Returns the new spec function. + */ + function matchesStrictComparable(key, srcValue) { + return function(object) { + if (object == null) { + return false; + } + return object[key] === srcValue && + (srcValue !== undefined || (key in Object(object))); + }; + } + + /** + * A specialized version of `_.memoize` which clears the memoized function's + * cache when it exceeds `MAX_MEMOIZE_SIZE`. + * + * @private + * @param {Function} func The function to have its output memoized. + * @returns {Function} Returns the new memoized function. + */ + function memoizeCapped(func) { + var result = memoize(func, function(key) { + if (cache.size === MAX_MEMOIZE_SIZE) { + cache.clear(); + } + return key; + }); + + var cache = result.cache; + return result; + } + + /** + * This function is like + * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys) + * except that it includes inherited enumerable properties. + * + * @private + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names. + */ + function nativeKeysIn(object) { + var result = []; + if (object != null) { + for (var key in Object(object)) { + result.push(key); + } + } + return result; + } + + /** + * Converts `value` to a string using `Object.prototype.toString`. + * + * @private + * @param {*} value The value to convert. + * @returns {string} Returns the converted string. + */ + function objectToString(value) { + return nativeObjectToString.call(value); + } + + /** + * A specialized version of `baseRest` which transforms the rest array. + * + * @private + * @param {Function} func The function to apply a rest parameter to. + * @param {number} [start=func.length-1] The start position of the rest parameter. + * @param {Function} transform The rest array transform. + * @returns {Function} Returns the new function. + */ + function overRest(func, start, transform) { + start = nativeMax(start === undefined ? (func.length - 1) : start, 0); + return function() { + var args = arguments, + index = -1, + length = nativeMax(args.length - start, 0), + array = Array(length); + + while (++index < length) { + array[index] = args[start + index]; + } + index = -1; + var otherArgs = Array(start + 1); + while (++index < start) { + otherArgs[index] = args[index]; + } + otherArgs[start] = transform(array); + return apply(func, this, otherArgs); + }; + } + + /** + * Gets the parent value at `path` of `object`. + * + * @private + * @param {Object} object The object to query. + * @param {Array} path The path to get the parent value of. + * @returns {*} Returns the parent value. + */ + function parent(object, path) { + return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1)); + } + + /** + * Reorder `array` according to the specified indexes where the element at + * the first index is assigned as the first element, the element at + * the second index is assigned as the second element, and so on. + * + * @private + * @param {Array} array The array to reorder. + * @param {Array} indexes The arranged array indexes. + * @returns {Array} Returns `array`. + */ + function reorder(array, indexes) { + var arrLength = array.length, + length = nativeMin(indexes.length, arrLength), + oldArray = copyArray(array); + + while (length--) { + var index = indexes[length]; + array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined; + } + return array; + } + + /** + * Sets metadata for `func`. + * + * **Note:** If this function becomes hot, i.e. is invoked a lot in a short + * period of time, it will trip its breaker and transition to an identity + * function to avoid garbage collection pauses in V8. See + * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070) + * for more details. + * + * @private + * @param {Function} func The function to associate metadata with. + * @param {*} data The metadata. + * @returns {Function} Returns `func`. + */ + var setData = shortOut(baseSetData); + + /** + * Sets the `toString` method of `func` to return `string`. + * + * @private + * @param {Function} func The function to modify. + * @param {Function} string The `toString` result. + * @returns {Function} Returns `func`. + */ + var setToString = shortOut(baseSetToString); + + /** + * Sets the `toString` method of `wrapper` to mimic the source of `reference` + * with wrapper details in a comment at the top of the source body. + * + * @private + * @param {Function} wrapper The function to modify. + * @param {Function} reference The reference function. + * @param {number} bitmask The bitmask flags. See `createWrap` for more details. + * @returns {Function} Returns `wrapper`. + */ + function setWrapToString(wrapper, reference, bitmask) { + var source = (reference + ''); + return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask))); + } + + /** + * Creates a function that'll short out and invoke `identity` instead + * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN` + * milliseconds. + * + * @private + * @param {Function} func The function to restrict. + * @returns {Function} Returns the new shortable function. + */ + function shortOut(func) { + var count = 0, + lastCalled = 0; + + return function() { + var stamp = nativeNow(), + remaining = HOT_SPAN - (stamp - lastCalled); + + lastCalled = stamp; + if (remaining > 0) { + if (++count >= HOT_COUNT) { + return arguments[0]; + } + } else { + count = 0; + } + return func.apply(undefined, arguments); + }; + } + + /** + * Converts `string` to a property path array. + * + * @private + * @param {string} string The string to convert. + * @returns {Array} Returns the property path array. + */ + var stringToPath = memoizeCapped(function(string) { + var result = []; + if (string.charCodeAt(0) === 46 /* . */) { + result.push(''); + } + string.replace(rePropName, function(match, number, quote, subString) { + result.push(quote ? subString.replace(reEscapeChar, '$1') : (number || match)); + }); + return result; + }); + + /** + * Converts `value` to a string key if it's not a string or symbol. + * + * @private + * @param {*} value The value to inspect. + * @returns {string|symbol} Returns the key. + */ + function toKey(value) { + if (typeof value == 'string' || isSymbol(value)) { + return value; + } + var result = (value + ''); + return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result; + } + + /** + * Converts `func` to its source code. + * + * @private + * @param {Function} func The function to convert. + * @returns {string} Returns the source code. + */ + function toSource(func) { + if (func != null) { + try { + return funcToString.call(func); + } catch (e) {} + try { + return (func + ''); + } catch (e) {} + } + return ''; + } + + /** + * Updates wrapper `details` based on `bitmask` flags. + * + * @private + * @returns {Array} details The details to modify. + * @param {number} bitmask The bitmask flags. See `createWrap` for more details. + * @returns {Array} Returns `details`. + */ + function updateWrapDetails(details, bitmask) { + arrayEach(wrapFlags, function(pair) { + var value = '_.' + pair[0]; + if ((bitmask & pair[1]) && !arrayIncludes(details, value)) { + details.push(value); + } + }); + return details.sort(); + } + + /** + * Creates a clone of `wrapper`. + * + * @private + * @param {Object} wrapper The wrapper to clone. + * @returns {Object} Returns the cloned wrapper. + */ + function wrapperClone(wrapper) { + if (wrapper instanceof LazyWrapper) { + return wrapper.clone(); + } + var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__); + result.__actions__ = copyArray(wrapper.__actions__); + result.__index__ = wrapper.__index__; + result.__values__ = wrapper.__values__; + return result; + } + + /*------------------------------------------------------------------------*/ + + /** + * Creates an array with all falsey values removed. The values `false`, `null`, + * `0`, `""`, `undefined`, and `NaN` are falsey. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to compact. + * @returns {Array} Returns the new array of filtered values. + * @example + * + * _.compact([0, 1, false, 2, '', 3]); + * // => [1, 2, 3] + */ + function compact(array) { + var index = -1, + length = array == null ? 0 : array.length, + resIndex = 0, + result = []; + + while (++index < length) { + var value = array[index]; + if (value) { + result[resIndex++] = value; + } + } + return result; + } + + /** + * Flattens `array` a single level deep. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to flatten. + * @returns {Array} Returns the new flattened array. + * @example + * + * _.flatten([1, [2, [3, [4]], 5]]); + * // => [1, 2, [3, [4]], 5] + */ + function flatten(array) { + var length = array == null ? 0 : array.length; + return length ? baseFlatten(array, 1) : []; + } + + /** + * Gets the first element of `array`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @alias first + * @category Array + * @param {Array} array The array to query. + * @returns {*} Returns the first element of `array`. + * @example + * + * _.head([1, 2, 3]); + * // => 1 + * + * _.head([]); + * // => undefined + */ + function head(array) { + return (array && array.length) ? array[0] : undefined; + } + + /** + * Creates an array of unique values that are included in all given arrays + * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * for equality comparisons. The order and references of result values are + * determined by the first array. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {...Array} [arrays] The arrays to inspect. + * @returns {Array} Returns the new array of intersecting values. + * @example + * + * _.intersection([2, 1], [2, 3]); + * // => [2] + */ + var intersection = baseRest(function(arrays) { + var mapped = arrayMap(arrays, castArrayLikeObject); + return (mapped.length && mapped[0] === arrays[0]) + ? baseIntersection(mapped) + : []; + }); + + /** + * Gets the last element of `array`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to query. + * @returns {*} Returns the last element of `array`. + * @example + * + * _.last([1, 2, 3]); + * // => 3 + */ + function last(array) { + var length = array == null ? 0 : array.length; + return length ? array[length - 1] : undefined; + } + + /** + * Reverses `array` so that the first element becomes the last, the second + * element becomes the second to last, and so on. + * + * **Note:** This method mutates `array` and is based on + * [`Array#reverse`](https://mdn.io/Array/reverse). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Array + * @param {Array} array The array to modify. + * @returns {Array} Returns `array`. + * @example + * + * var array = [1, 2, 3]; + * + * _.reverse(array); + * // => [3, 2, 1] + * + * console.log(array); + * // => [3, 2, 1] + */ + function reverse(array) { + return array == null ? array : nativeReverse.call(array); + } + + /** + * Creates an array of unique values, in order, from all given arrays using + * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * for equality comparisons. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {...Array} [arrays] The arrays to inspect. + * @returns {Array} Returns the new array of combined values. + * @example + * + * _.union([2], [1, 2]); + * // => [2, 1] + */ + var union = baseRest(function(arrays) { + return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true)); + }); + + /** + * Creates a duplicate-free version of an array, using + * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * for equality comparisons, in which only the first occurrence of each element + * is kept. The order of result values is determined by the order they occur + * in the array. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to inspect. + * @returns {Array} Returns the new duplicate free array. + * @example + * + * _.uniq([2, 1, 2]); + * // => [2, 1] + */ + function uniq(array) { + return (array && array.length) ? baseUniq(array) : []; + } + + /** + * Creates an array excluding all given values using + * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * for equality comparisons. + * + * **Note:** Unlike `_.pull`, this method returns a new array. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Array + * @param {Array} array The array to inspect. + * @param {...*} [values] The values to exclude. + * @returns {Array} Returns the new array of filtered values. + * @see _.difference, _.xor + * @example + * + * _.without([2, 1, 2, 3], 1, 2); + * // => [3] + */ + var without = baseRest(function(array, values) { + return isArrayLikeObject(array) + ? baseDifference(array, values) + : []; + }); + + /*------------------------------------------------------------------------*/ + + /** + * Creates a `lodash` wrapper instance that wraps `value` with explicit method + * chain sequences enabled. The result of such sequences must be unwrapped + * with `_#value`. + * + * @static + * @memberOf _ + * @since 1.3.0 + * @category Seq + * @param {*} value The value to wrap. + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * var users = [ + * { 'user': 'barney', 'age': 36 }, + * { 'user': 'fred', 'age': 40 }, + * { 'user': 'pebbles', 'age': 1 } + * ]; + * + * var youngest = _ + * .chain(users) + * .sortBy('age') + * .map(function(o) { + * return o.user + ' is ' + o.age; + * }) + * .head() + * .value(); + * // => 'pebbles is 1' + */ + function chain(value) { + var result = lodash(value); + result.__chain__ = true; + return result; + } + + /** + * This method invokes `interceptor` and returns `value`. The interceptor + * is invoked with one argument; (value). The purpose of this method is to + * "tap into" a method chain sequence in order to modify intermediate results. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Seq + * @param {*} value The value to provide to `interceptor`. + * @param {Function} interceptor The function to invoke. + * @returns {*} Returns `value`. + * @example + * + * _([1, 2, 3]) + * .tap(function(array) { + * // Mutate input array. + * array.pop(); + * }) + * .reverse() + * .value(); + * // => [2, 1] + */ + function tap(value, interceptor) { + interceptor(value); + return value; + } + + /** + * This method is like `_.tap` except that it returns the result of `interceptor`. + * The purpose of this method is to "pass thru" values replacing intermediate + * results in a method chain sequence. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Seq + * @param {*} value The value to provide to `interceptor`. + * @param {Function} interceptor The function to invoke. + * @returns {*} Returns the result of `interceptor`. + * @example + * + * _(' abc ') + * .chain() + * .trim() + * .thru(function(value) { + * return [value]; + * }) + * .value(); + * // => ['abc'] + */ + function thru(value, interceptor) { + return interceptor(value); + } + + /** + * This method is the wrapper version of `_.at`. + * + * @name at + * @memberOf _ + * @since 1.0.0 + * @category Seq + * @param {...(string|string[])} [paths] The property paths to pick. + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] }; + * + * _(object).at(['a[0].b.c', 'a[1]']).value(); + * // => [3, 4] + */ + var wrapperAt = flatRest(function(paths) { + var length = paths.length, + start = length ? paths[0] : 0, + value = this.__wrapped__, + interceptor = function(object) { return baseAt(object, paths); }; + + if (length > 1 || this.__actions__.length || + !(value instanceof LazyWrapper) || !isIndex(start)) { + return this.thru(interceptor); + } + value = value.slice(start, +start + (length ? 1 : 0)); + value.__actions__.push({ + 'func': thru, + 'args': [interceptor], + 'thisArg': undefined + }); + return new LodashWrapper(value, this.__chain__).thru(function(array) { + if (length && !array.length) { + array.push(undefined); + } + return array; + }); + }); + + /** + * Creates a `lodash` wrapper instance with explicit method chain sequences enabled. + * + * @name chain + * @memberOf _ + * @since 0.1.0 + * @category Seq + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * var users = [ + * { 'user': 'barney', 'age': 36 }, + * { 'user': 'fred', 'age': 40 } + * ]; + * + * // A sequence without explicit chaining. + * _(users).head(); + * // => { 'user': 'barney', 'age': 36 } + * + * // A sequence with explicit chaining. + * _(users) + * .chain() + * .head() + * .pick('user') + * .value(); + * // => { 'user': 'barney' } + */ + function wrapperChain() { + return chain(this); + } + + /** + * Executes the chain sequence and returns the wrapped result. + * + * @name commit + * @memberOf _ + * @since 3.2.0 + * @category Seq + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * var array = [1, 2]; + * var wrapped = _(array).push(3); + * + * console.log(array); + * // => [1, 2] + * + * wrapped = wrapped.commit(); + * console.log(array); + * // => [1, 2, 3] + * + * wrapped.last(); + * // => 3 + * + * console.log(array); + * // => [1, 2, 3] + */ + function wrapperCommit() { + return new LodashWrapper(this.value(), this.__chain__); + } + + /** + * Gets the next value on a wrapped object following the + * [iterator protocol](https://mdn.io/iteration_protocols#iterator). + * + * @name next + * @memberOf _ + * @since 4.0.0 + * @category Seq + * @returns {Object} Returns the next iterator value. + * @example + * + * var wrapped = _([1, 2]); + * + * wrapped.next(); + * // => { 'done': false, 'value': 1 } + * + * wrapped.next(); + * // => { 'done': false, 'value': 2 } + * + * wrapped.next(); + * // => { 'done': true, 'value': undefined } + */ + function wrapperNext() { + if (this.__values__ === undefined) { + this.__values__ = toArray(this.value()); + } + var done = this.__index__ >= this.__values__.length, + value = done ? undefined : this.__values__[this.__index__++]; + + return { 'done': done, 'value': value }; + } + + /** + * Enables the wrapper to be iterable. + * + * @name Symbol.iterator + * @memberOf _ + * @since 4.0.0 + * @category Seq + * @returns {Object} Returns the wrapper object. + * @example + * + * var wrapped = _([1, 2]); + * + * wrapped[Symbol.iterator]() === wrapped; + * // => true + * + * Array.from(wrapped); + * // => [1, 2] + */ + function wrapperToIterator() { + return this; + } + + /** + * Creates a clone of the chain sequence planting `value` as the wrapped value. + * + * @name plant + * @memberOf _ + * @since 3.2.0 + * @category Seq + * @param {*} value The value to plant. + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * function square(n) { + * return n * n; + * } + * + * var wrapped = _([1, 2]).map(square); + * var other = wrapped.plant([3, 4]); + * + * other.value(); + * // => [9, 16] + * + * wrapped.value(); + * // => [1, 4] + */ + function wrapperPlant(value) { + var result, + parent = this; + + while (parent instanceof baseLodash) { + var clone = wrapperClone(parent); + clone.__index__ = 0; + clone.__values__ = undefined; + if (result) { + previous.__wrapped__ = clone; + } else { + result = clone; + } + var previous = clone; + parent = parent.__wrapped__; + } + previous.__wrapped__ = value; + return result; + } + + /** + * This method is the wrapper version of `_.reverse`. + * + * **Note:** This method mutates the wrapped array. + * + * @name reverse + * @memberOf _ + * @since 0.1.0 + * @category Seq + * @returns {Object} Returns the new `lodash` wrapper instance. + * @example + * + * var array = [1, 2, 3]; + * + * _(array).reverse().value() + * // => [3, 2, 1] + * + * console.log(array); + * // => [3, 2, 1] + */ + function wrapperReverse() { + var value = this.__wrapped__; + if (value instanceof LazyWrapper) { + var wrapped = value; + if (this.__actions__.length) { + wrapped = new LazyWrapper(this); + } + wrapped = wrapped.reverse(); + wrapped.__actions__.push({ + 'func': thru, + 'args': [reverse], + 'thisArg': undefined + }); + return new LodashWrapper(wrapped, this.__chain__); + } + return this.thru(reverse); + } + + /** + * Executes the chain sequence to resolve the unwrapped value. + * + * @name value + * @memberOf _ + * @since 0.1.0 + * @alias toJSON, valueOf + * @category Seq + * @returns {*} Returns the resolved unwrapped value. + * @example + * + * _([1, 2, 3]).value(); + * // => [1, 2, 3] + */ + function wrapperValue() { + return baseWrapperValue(this.__wrapped__, this.__actions__); + } + + /*------------------------------------------------------------------------*/ + + /** + * Checks if `predicate` returns truthy for **all** elements of `collection`. + * Iteration is stopped once `predicate` returns falsey. The predicate is + * invoked with three arguments: (value, index|key, collection). + * + * **Note:** This method returns `true` for + * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because + * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of + * elements of empty collections. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. + * @returns {boolean} Returns `true` if all elements pass the predicate check, + * else `false`. + * @example + * + * _.every([true, 1, null, 'yes'], Boolean); + * // => false + * + * var users = [ + * { 'user': 'barney', 'age': 36, 'active': false }, + * { 'user': 'fred', 'age': 40, 'active': false } + * ]; + * + * // The `_.matches` iteratee shorthand. + * _.every(users, { 'user': 'barney', 'active': false }); + * // => false + * + * // The `_.matchesProperty` iteratee shorthand. + * _.every(users, ['active', false]); + * // => true + * + * // The `_.property` iteratee shorthand. + * _.every(users, 'active'); + * // => false + */ + function every(collection, predicate, guard) { + var func = isArray(collection) ? arrayEvery : baseEvery; + if (guard && isIterateeCall(collection, predicate, guard)) { + predicate = undefined; + } + return func(collection, getIteratee(predicate, 3)); + } + + /** + * Iterates over elements of `collection`, returning an array of all elements + * `predicate` returns truthy for. The predicate is invoked with three + * arguments: (value, index|key, collection). + * + * **Note:** Unlike `_.remove`, this method returns a new array. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {Array} Returns the new filtered array. + * @see _.reject + * @example + * + * var users = [ + * { 'user': 'barney', 'age': 36, 'active': true }, + * { 'user': 'fred', 'age': 40, 'active': false } + * ]; + * + * _.filter(users, function(o) { return !o.active; }); + * // => objects for ['fred'] + * + * // The `_.matches` iteratee shorthand. + * _.filter(users, { 'age': 36, 'active': true }); + * // => objects for ['barney'] + * + * // The `_.matchesProperty` iteratee shorthand. + * _.filter(users, ['active', false]); + * // => objects for ['fred'] + * + * // The `_.property` iteratee shorthand. + * _.filter(users, 'active'); + * // => objects for ['barney'] + */ + function filter(collection, predicate) { + var func = isArray(collection) ? arrayFilter : baseFilter; + return func(collection, getIteratee(predicate, 3)); + } + + /** + * Iterates over elements of `collection` and invokes `iteratee` for each element. + * The iteratee is invoked with three arguments: (value, index|key, collection). + * Iteratee functions may exit iteration early by explicitly returning `false`. + * + * **Note:** As with other "Collections" methods, objects with a "length" + * property are iterated like arrays. To avoid this behavior use `_.forIn` + * or `_.forOwn` for object iteration. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @alias each + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Array|Object} Returns `collection`. + * @see _.forEachRight + * @example + * + * _.forEach([1, 2], function(value) { + * console.log(value); + * }); + * // => Logs `1` then `2`. + * + * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) { + * console.log(key); + * }); + * // => Logs 'a' then 'b' (iteration order is not guaranteed). + */ + function forEach(collection, iteratee) { + var func = isArray(collection) ? arrayEach : baseEach; + return func(collection, getIteratee(iteratee, 3)); + } + + /** + * Creates an array of values by running each element in `collection` thru + * `iteratee`. The iteratee is invoked with three arguments: + * (value, index|key, collection). + * + * Many lodash methods are guarded to work as iteratees for methods like + * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`. + * + * The guarded methods are: + * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`, + * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`, + * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`, + * `template`, `trim`, `trimEnd`, `trimStart`, and `words` + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @returns {Array} Returns the new mapped array. + * @example + * + * function square(n) { + * return n * n; + * } + * + * _.map([4, 8], square); + * // => [16, 64] + * + * _.map({ 'a': 4, 'b': 8 }, square); + * // => [16, 64] (iteration order is not guaranteed) + * + * var users = [ + * { 'user': 'barney' }, + * { 'user': 'fred' } + * ]; + * + * // The `_.property` iteratee shorthand. + * _.map(users, 'user'); + * // => ['barney', 'fred'] + */ + function map(collection, iteratee) { + var func = isArray(collection) ? arrayMap : baseMap; + return func(collection, getIteratee(iteratee, 3)); + } + + /** + * Reduces `collection` to a value which is the accumulated result of running + * each element in `collection` thru `iteratee`, where each successive + * invocation is supplied the return value of the previous. If `accumulator` + * is not given, the first element of `collection` is used as the initial + * value. The iteratee is invoked with four arguments: + * (accumulator, value, index|key, collection). + * + * Many lodash methods are guarded to work as iteratees for methods like + * `_.reduce`, `_.reduceRight`, and `_.transform`. + * + * The guarded methods are: + * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`, + * and `sortBy` + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [iteratee=_.identity] The function invoked per iteration. + * @param {*} [accumulator] The initial value. + * @returns {*} Returns the accumulated value. + * @see _.reduceRight + * @example + * + * _.reduce([1, 2], function(sum, n) { + * return sum + n; + * }, 0); + * // => 3 + * + * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) { + * (result[value] || (result[value] = [])).push(key); + * return result; + * }, {}); + * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed) + */ + function reduce(collection, iteratee, accumulator) { + var func = isArray(collection) ? arrayReduce : baseReduce, + initAccum = arguments.length < 3; + + return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach); + } + + /** + * The opposite of `_.filter`; this method returns the elements of `collection` + * that `predicate` does **not** return truthy for. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [predicate=_.identity] The function invoked per iteration. + * @returns {Array} Returns the new filtered array. + * @see _.filter + * @example + * + * var users = [ + * { 'user': 'barney', 'age': 36, 'active': false }, + * { 'user': 'fred', 'age': 40, 'active': true } + * ]; + * + * _.reject(users, function(o) { return !o.active; }); + * // => objects for ['fred'] + * + * // The `_.matches` iteratee shorthand. + * _.reject(users, { 'age': 40, 'active': true }); + * // => objects for ['barney'] + * + * // The `_.matchesProperty` iteratee shorthand. + * _.reject(users, ['active', false]); + * // => objects for ['fred'] + * + * // The `_.property` iteratee shorthand. + * _.reject(users, 'active'); + * // => objects for ['barney'] + */ + function reject(collection, predicate) { + var func = isArray(collection) ? arrayFilter : baseFilter; + return func(collection, negate(getIteratee(predicate, 3))); + } + + /** + * Creates an array of elements, sorted in ascending order by the results of + * running each element in a collection thru each iteratee. This method + * performs a stable sort, that is, it preserves the original sort order of + * equal elements. The iteratees are invoked with one argument: (value). + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Collection + * @param {Array|Object} collection The collection to iterate over. + * @param {...(Function|Function[])} [iteratees=[_.identity]] + * The iteratees to sort by. + * @returns {Array} Returns the new sorted array. + * @example + * + * var users = [ + * { 'user': 'fred', 'age': 48 }, + * { 'user': 'barney', 'age': 36 }, + * { 'user': 'fred', 'age': 40 }, + * { 'user': 'barney', 'age': 34 } + * ]; + * + * _.sortBy(users, [function(o) { return o.user; }]); + * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]] + * + * _.sortBy(users, ['user', 'age']); + * // => objects for [['barney', 34], ['barney', 36], ['fred', 40], ['fred', 48]] + */ + var sortBy = baseRest(function(collection, iteratees) { + if (collection == null) { + return []; + } + var length = iteratees.length; + if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) { + iteratees = []; + } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) { + iteratees = [iteratees[0]]; + } + return baseOrderBy(collection, baseFlatten(iteratees, 1), []); + }); + + /*------------------------------------------------------------------------*/ + + /** + * Gets the timestamp of the number of milliseconds that have elapsed since + * the Unix epoch (1 January 1970 00:00:00 UTC). + * + * @static + * @memberOf _ + * @since 2.4.0 + * @category Date + * @returns {number} Returns the timestamp. + * @example + * + * _.defer(function(stamp) { + * console.log(_.now() - stamp); + * }, _.now()); + * // => Logs the number of milliseconds it took for the deferred invocation. + */ + var now = function() { + return root.Date.now(); + }; + + /*------------------------------------------------------------------------*/ + + /** + * Creates a debounced function that delays invoking `func` until after `wait` + * milliseconds have elapsed since the last time the debounced function was + * invoked. The debounced function comes with a `cancel` method to cancel + * delayed `func` invocations and a `flush` method to immediately invoke them. + * Provide `options` to indicate whether `func` should be invoked on the + * leading and/or trailing edge of the `wait` timeout. The `func` is invoked + * with the last arguments provided to the debounced function. Subsequent + * calls to the debounced function return the result of the last `func` + * invocation. + * + * **Note:** If `leading` and `trailing` options are `true`, `func` is + * invoked on the trailing edge of the timeout only if the debounced function + * is invoked more than once during the `wait` timeout. + * + * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred + * until to the next tick, similar to `setTimeout` with a timeout of `0`. + * + * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/) + * for details over the differences between `_.debounce` and `_.throttle`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {Function} func The function to debounce. + * @param {number} [wait=0] The number of milliseconds to delay. + * @param {Object} [options={}] The options object. + * @param {boolean} [options.leading=false] + * Specify invoking on the leading edge of the timeout. + * @param {number} [options.maxWait] + * The maximum time `func` is allowed to be delayed before it's invoked. + * @param {boolean} [options.trailing=true] + * Specify invoking on the trailing edge of the timeout. + * @returns {Function} Returns the new debounced function. + * @example + * + * // Avoid costly calculations while the window size is in flux. + * jQuery(window).on('resize', _.debounce(calculateLayout, 150)); + * + * // Invoke `sendMail` when clicked, debouncing subsequent calls. + * jQuery(element).on('click', _.debounce(sendMail, 300, { + * 'leading': true, + * 'trailing': false + * })); + * + * // Ensure `batchLog` is invoked once after 1 second of debounced calls. + * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 }); + * var source = new EventSource('/stream'); + * jQuery(source).on('message', debounced); + * + * // Cancel the trailing debounced invocation. + * jQuery(window).on('popstate', debounced.cancel); + */ + function debounce(func, wait, options) { + var lastArgs, + lastThis, + maxWait, + result, + timerId, + lastCallTime, + lastInvokeTime = 0, + leading = false, + maxing = false, + trailing = true; + + if (typeof func != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + wait = toNumber(wait) || 0; + if (isObject(options)) { + leading = !!options.leading; + maxing = 'maxWait' in options; + maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait; + trailing = 'trailing' in options ? !!options.trailing : trailing; + } + + function invokeFunc(time) { + var args = lastArgs, + thisArg = lastThis; + + lastArgs = lastThis = undefined; + lastInvokeTime = time; + result = func.apply(thisArg, args); return result; } - /** - * Creates a function that passes `value` to the `wrapper` function as its - * first argument. Additional arguments passed to the function are appended - * to those passed to the `wrapper` function. The `wrapper` is executed with - * the `this` binding of the created function. - * - * @static - * @memberOf _ - * @category Functions - * @param {Mixed} value The value to wrap. - * @param {Function} wrapper The wrapper function. - * @returns {Function} Returns the new function. - * @example - * - * var hello = function(name) { return 'hello ' + name; }; - * hello = _.wrap(hello, function(func) { - * return 'before, ' + func('moe') + ', after'; - * }); - * hello(); - * // => 'before, hello moe, after' - */ - function wrap(value, wrapper) { - return function() { - var args = [value]; - push.apply(args, arguments); - return wrapper.apply(this, args); - }; + function leadingEdge(time) { + // Reset any `maxWait` timer. + lastInvokeTime = time; + // Start the timer for the trailing edge. + timerId = setTimeout(timerExpired, wait); + // Invoke the leading edge. + return leading ? invokeFunc(time) : result; } - /*--------------------------------------------------------------------------*/ + function remainingWait(time) { + var timeSinceLastCall = time - lastCallTime, + timeSinceLastInvoke = time - lastInvokeTime, + timeWaiting = wait - timeSinceLastCall; - /** - * Converts the characters `&`, `<`, `>`, `"`, and `'` in `string` to their - * corresponding HTML entities. - * - * @static - * @memberOf _ - * @category Utilities - * @param {String} string The string to escape. - * @returns {String} Returns the escaped string. - * @example - * - * _.escape('Moe, Larry & Curly'); - * // => 'Moe, Larry & Curly' - */ - function escape(string) { - return string == null ? '' : String(string).replace(reUnescapedHtml, escapeHtmlChar); + return maxing + ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke) + : timeWaiting; } - /** - * This method returns the first argument passed to it. - * - * @static - * @memberOf _ - * @category Utilities - * @param {Mixed} value Any value. - * @returns {Mixed} Returns `value`. - * @example - * - * var moe = { 'name': 'moe' }; - * moe === _.identity(moe); - * // => true - */ - function identity(value) { + function shouldInvoke(time) { + var timeSinceLastCall = time - lastCallTime, + timeSinceLastInvoke = time - lastInvokeTime; + + // Either this is the first call, activity has stopped and we're at the + // trailing edge, the system time has gone backwards and we're treating + // it as the trailing edge, or we've hit the `maxWait` limit. + return (lastCallTime === undefined || (timeSinceLastCall >= wait) || + (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait)); + } + + function timerExpired() { + var time = now(); + if (shouldInvoke(time)) { + return trailingEdge(time); + } + // Restart the timer. + timerId = setTimeout(timerExpired, remainingWait(time)); + } + + function trailingEdge(time) { + timerId = undefined; + + // Only invoke if we have `lastArgs` which means `func` has been + // debounced at least once. + if (trailing && lastArgs) { + return invokeFunc(time); + } + lastArgs = lastThis = undefined; + return result; + } + + function cancel() { + if (timerId !== undefined) { + clearTimeout(timerId); + } + lastInvokeTime = 0; + lastArgs = lastCallTime = lastThis = timerId = undefined; + } + + function flush() { + return timerId === undefined ? result : trailingEdge(now()); + } + + function debounced() { + var time = now(), + isInvoking = shouldInvoke(time); + + lastArgs = arguments; + lastThis = this; + lastCallTime = time; + + if (isInvoking) { + if (timerId === undefined) { + return leadingEdge(lastCallTime); + } + if (maxing) { + // Handle invocations in a tight loop. + timerId = setTimeout(timerExpired, wait); + return invokeFunc(lastCallTime); + } + } + if (timerId === undefined) { + timerId = setTimeout(timerExpired, wait); + } + return result; + } + debounced.cancel = cancel; + debounced.flush = flush; + return debounced; + } + + /** + * Invokes `func` after `wait` milliseconds. Any additional arguments are + * provided to `func` when it's invoked. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {Function} func The function to delay. + * @param {number} wait The number of milliseconds to delay invocation. + * @param {...*} [args] The arguments to invoke `func` with. + * @returns {number} Returns the timer id. + * @example + * + * _.delay(function(text) { + * console.log(text); + * }, 1000, 'later'); + * // => Logs 'later' after one second. + */ + var delay = baseRest(function(func, wait, args) { + return baseDelay(func, toNumber(wait) || 0, args); + }); + + /** + * Creates a function that memoizes the result of `func`. If `resolver` is + * provided, it determines the cache key for storing the result based on the + * arguments provided to the memoized function. By default, the first argument + * provided to the memoized function is used as the map cache key. The `func` + * is invoked with the `this` binding of the memoized function. + * + * **Note:** The cache is exposed as the `cache` property on the memoized + * function. Its creation may be customized by replacing the `_.memoize.Cache` + * constructor with one whose instances implement the + * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object) + * method interface of `clear`, `delete`, `get`, `has`, and `set`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {Function} func The function to have its output memoized. + * @param {Function} [resolver] The function to resolve the cache key. + * @returns {Function} Returns the new memoized function. + * @example + * + * var object = { 'a': 1, 'b': 2 }; + * var other = { 'c': 3, 'd': 4 }; + * + * var values = _.memoize(_.values); + * values(object); + * // => [1, 2] + * + * values(other); + * // => [3, 4] + * + * object.a = 2; + * values(object); + * // => [1, 2] + * + * // Modify the result cache. + * values.cache.set(object, ['a', 'b']); + * values(object); + * // => ['a', 'b'] + * + * // Replace `_.memoize.Cache`. + * _.memoize.Cache = WeakMap; + */ + function memoize(func, resolver) { + if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) { + throw new TypeError(FUNC_ERROR_TEXT); + } + var memoized = function() { + var args = arguments, + key = resolver ? resolver.apply(this, args) : args[0], + cache = memoized.cache; + + if (cache.has(key)) { + return cache.get(key); + } + var result = func.apply(this, args); + memoized.cache = cache.set(key, result) || cache; + return result; + }; + memoized.cache = new (memoize.Cache || MapCache); + return memoized; + } + + // Expose `MapCache`. + memoize.Cache = MapCache; + + /** + * Creates a function that negates the result of the predicate `func`. The + * `func` predicate is invoked with the `this` binding and arguments of the + * created function. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Function + * @param {Function} predicate The predicate to negate. + * @returns {Function} Returns the new negated function. + * @example + * + * function isEven(n) { + * return n % 2 == 0; + * } + * + * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven)); + * // => [1, 3, 5] + */ + function negate(predicate) { + if (typeof predicate != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + return function() { + var args = arguments; + switch (args.length) { + case 0: return !predicate.call(this); + case 1: return !predicate.call(this, args[0]); + case 2: return !predicate.call(this, args[0], args[1]); + case 3: return !predicate.call(this, args[0], args[1], args[2]); + } + return !predicate.apply(this, args); + }; + } + + /** + * Creates a throttled function that only invokes `func` at most once per + * every `wait` milliseconds. The throttled function comes with a `cancel` + * method to cancel delayed `func` invocations and a `flush` method to + * immediately invoke them. Provide `options` to indicate whether `func` + * should be invoked on the leading and/or trailing edge of the `wait` + * timeout. The `func` is invoked with the last arguments provided to the + * throttled function. Subsequent calls to the throttled function return the + * result of the last `func` invocation. + * + * **Note:** If `leading` and `trailing` options are `true`, `func` is + * invoked on the trailing edge of the timeout only if the throttled function + * is invoked more than once during the `wait` timeout. + * + * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred + * until to the next tick, similar to `setTimeout` with a timeout of `0`. + * + * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/) + * for details over the differences between `_.throttle` and `_.debounce`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Function + * @param {Function} func The function to throttle. + * @param {number} [wait=0] The number of milliseconds to throttle invocations to. + * @param {Object} [options={}] The options object. + * @param {boolean} [options.leading=true] + * Specify invoking on the leading edge of the timeout. + * @param {boolean} [options.trailing=true] + * Specify invoking on the trailing edge of the timeout. + * @returns {Function} Returns the new throttled function. + * @example + * + * // Avoid excessively updating the position while scrolling. + * jQuery(window).on('scroll', _.throttle(updatePosition, 100)); + * + * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes. + * var throttled = _.throttle(renewToken, 300000, { 'trailing': false }); + * jQuery(element).on('click', throttled); + * + * // Cancel the trailing throttled invocation. + * jQuery(window).on('popstate', throttled.cancel); + */ + function throttle(func, wait, options) { + var leading = true, + trailing = true; + + if (typeof func != 'function') { + throw new TypeError(FUNC_ERROR_TEXT); + } + if (isObject(options)) { + leading = 'leading' in options ? !!options.leading : leading; + trailing = 'trailing' in options ? !!options.trailing : trailing; + } + return debounce(func, wait, { + 'leading': leading, + 'maxWait': wait, + 'trailing': trailing + }); + } + + /*------------------------------------------------------------------------*/ + + /** + * Creates a shallow clone of `value`. + * + * **Note:** This method is loosely based on the + * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm) + * and supports cloning arrays, array buffers, booleans, date objects, maps, + * numbers, `Object` objects, regexes, sets, strings, symbols, and typed + * arrays. The own enumerable properties of `arguments` objects are cloned + * as plain objects. An empty object is returned for uncloneable values such + * as error objects, functions, DOM nodes, and WeakMaps. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to clone. + * @returns {*} Returns the cloned value. + * @see _.cloneDeep + * @example + * + * var objects = [{ 'a': 1 }, { 'b': 2 }]; + * + * var shallow = _.clone(objects); + * console.log(shallow[0] === objects[0]); + * // => true + */ + function clone(value) { + return baseClone(value, CLONE_SYMBOLS_FLAG); + } + + /** + * Performs a + * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) + * comparison between two values to determine if they are equivalent. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if the values are equivalent, else `false`. + * @example + * + * var object = { 'a': 1 }; + * var other = { 'a': 1 }; + * + * _.eq(object, object); + * // => true + * + * _.eq(object, other); + * // => false + * + * _.eq('a', 'a'); + * // => true + * + * _.eq('a', Object('a')); + * // => false + * + * _.eq(NaN, NaN); + * // => true + */ + function eq(value, other) { + return value === other || (value !== value && other !== other); + } + + /** + * Checks if `value` is likely an `arguments` object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an `arguments` object, + * else `false`. + * @example + * + * _.isArguments(function() { return arguments; }()); + * // => true + * + * _.isArguments([1, 2, 3]); + * // => false + */ + var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) { + return isObjectLike(value) && hasOwnProperty.call(value, 'callee') && + !propertyIsEnumerable.call(value, 'callee'); + }; + + /** + * Checks if `value` is classified as an `Array` object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an array, else `false`. + * @example + * + * _.isArray([1, 2, 3]); + * // => true + * + * _.isArray(document.body.children); + * // => false + * + * _.isArray('abc'); + * // => false + * + * _.isArray(_.noop); + * // => false + */ + var isArray = Array.isArray; + + /** + * Checks if `value` is array-like. A value is considered array-like if it's + * not a function and has a `value.length` that's an integer greater than or + * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is array-like, else `false`. + * @example + * + * _.isArrayLike([1, 2, 3]); + * // => true + * + * _.isArrayLike(document.body.children); + * // => true + * + * _.isArrayLike('abc'); + * // => true + * + * _.isArrayLike(_.noop); + * // => false + */ + function isArrayLike(value) { + return value != null && isLength(value.length) && !isFunction(value); + } + + /** + * This method is like `_.isArrayLike` except that it also checks if `value` + * is an object. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an array-like object, + * else `false`. + * @example + * + * _.isArrayLikeObject([1, 2, 3]); + * // => true + * + * _.isArrayLikeObject(document.body.children); + * // => true + * + * _.isArrayLikeObject('abc'); + * // => false + * + * _.isArrayLikeObject(_.noop); + * // => false + */ + function isArrayLikeObject(value) { + return isObjectLike(value) && isArrayLike(value); + } + + /** + * Checks if `value` is a buffer. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a buffer, else `false`. + * @example + * + * _.isBuffer(new Buffer(2)); + * // => true + * + * _.isBuffer(new Uint8Array(2)); + * // => false + */ + var isBuffer = nativeIsBuffer || stubFalse; + + /** + * Checks if `value` is an empty object, collection, map, or set. + * + * Objects are considered empty if they have no own enumerable string keyed + * properties. + * + * Array-like values such as `arguments` objects, arrays, buffers, strings, or + * jQuery-like collections are considered empty if they have a `length` of `0`. + * Similarly, maps and sets are considered empty if they have a `size` of `0`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is empty, else `false`. + * @example + * + * _.isEmpty(null); + * // => true + * + * _.isEmpty(true); + * // => true + * + * _.isEmpty(1); + * // => true + * + * _.isEmpty([1, 2, 3]); + * // => false + * + * _.isEmpty({ 'a': 1 }); + * // => false + */ + function isEmpty(value) { + if (value == null) { + return true; + } + if (isArrayLike(value) && + (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' || + isBuffer(value) || isTypedArray(value) || isArguments(value))) { + return !value.length; + } + var tag = getTag(value); + if (tag == mapTag || tag == setTag) { + return !value.size; + } + if (isPrototype(value)) { + return !baseKeys(value).length; + } + for (var key in value) { + if (hasOwnProperty.call(value, key)) { + return false; + } + } + return true; + } + + /** + * Performs a deep comparison between two values to determine if they are + * equivalent. + * + * **Note:** This method supports comparing arrays, array buffers, booleans, + * date objects, error objects, maps, numbers, `Object` objects, regexes, + * sets, strings, symbols, and typed arrays. `Object` objects are compared + * by their own, not inherited, enumerable properties. Functions and DOM + * nodes are compared by strict equality, i.e. `===`. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to compare. + * @param {*} other The other value to compare. + * @returns {boolean} Returns `true` if the values are equivalent, else `false`. + * @example + * + * var object = { 'a': 1 }; + * var other = { 'a': 1 }; + * + * _.isEqual(object, other); + * // => true + * + * object === other; + * // => false + */ + function isEqual(value, other) { + return baseIsEqual(value, other); + } + + /** + * Checks if `value` is classified as a `Function` object. + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a function, else `false`. + * @example + * + * _.isFunction(_); + * // => true + * + * _.isFunction(/abc/); + * // => false + */ + function isFunction(value) { + if (!isObject(value)) { + return false; + } + // The use of `Object#toString` avoids issues with the `typeof` operator + // in Safari 9 which returns 'object' for typed arrays and other constructors. + var tag = baseGetTag(value); + return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag; + } + + /** + * Checks if `value` is a valid array-like length. + * + * **Note:** This method is loosely based on + * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a valid length, else `false`. + * @example + * + * _.isLength(3); + * // => true + * + * _.isLength(Number.MIN_VALUE); + * // => false + * + * _.isLength(Infinity); + * // => false + * + * _.isLength('3'); + * // => false + */ + function isLength(value) { + return typeof value == 'number' && + value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER; + } + + /** + * Checks if `value` is the + * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types) + * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`) + * + * @static + * @memberOf _ + * @since 0.1.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is an object, else `false`. + * @example + * + * _.isObject({}); + * // => true + * + * _.isObject([1, 2, 3]); + * // => true + * + * _.isObject(_.noop); + * // => true + * + * _.isObject(null); + * // => false + */ + function isObject(value) { + var type = typeof value; + return value != null && (type == 'object' || type == 'function'); + } + + /** + * Checks if `value` is object-like. A value is object-like if it's not `null` + * and has a `typeof` result of "object". + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is object-like, else `false`. + * @example + * + * _.isObjectLike({}); + * // => true + * + * _.isObjectLike([1, 2, 3]); + * // => true + * + * _.isObjectLike(_.noop); + * // => false + * + * _.isObjectLike(null); + * // => false + */ + function isObjectLike(value) { + return value != null && typeof value == 'object'; + } + + /** + * Checks if `value` is classified as a `Map` object. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a map, else `false`. + * @example + * + * _.isMap(new Map); + * // => true + * + * _.isMap(new WeakMap); + * // => false + */ + var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap; + + /** + * Checks if `value` is a plain object, that is, an object created by the + * `Object` constructor or one with a `[[Prototype]]` of `null`. + * + * @static + * @memberOf _ + * @since 0.8.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a plain object, else `false`. + * @example + * + * function Foo() { + * this.a = 1; + * } + * + * _.isPlainObject(new Foo); + * // => false + * + * _.isPlainObject([1, 2, 3]); + * // => false + * + * _.isPlainObject({ 'x': 0, 'y': 0 }); + * // => true + * + * _.isPlainObject(Object.create(null)); + * // => true + */ + function isPlainObject(value) { + if (!isObjectLike(value) || baseGetTag(value) != objectTag) { + return false; + } + var proto = getPrototype(value); + if (proto === null) { + return true; + } + var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor; + return typeof Ctor == 'function' && Ctor instanceof Ctor && + funcToString.call(Ctor) == objectCtorString; + } + + /** + * Checks if `value` is classified as a `Set` object. + * + * @static + * @memberOf _ + * @since 4.3.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a set, else `false`. + * @example + * + * _.isSet(new Set); + * // => true + * + * _.isSet(new WeakSet); + * // => false + */ + var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet; + + /** + * Checks if `value` is classified as a `String` primitive or object. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a string, else `false`. + * @example + * + * _.isString('abc'); + * // => true + * + * _.isString(1); + * // => false + */ + function isString(value) { + return typeof value == 'string' || + (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag); + } + + /** + * Checks if `value` is classified as a `Symbol` primitive or object. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a symbol, else `false`. + * @example + * + * _.isSymbol(Symbol.iterator); + * // => true + * + * _.isSymbol('abc'); + * // => false + */ + function isSymbol(value) { + return typeof value == 'symbol' || + (isObjectLike(value) && baseGetTag(value) == symbolTag); + } + + /** + * Checks if `value` is classified as a typed array. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Lang + * @param {*} value The value to check. + * @returns {boolean} Returns `true` if `value` is a typed array, else `false`. + * @example + * + * _.isTypedArray(new Uint8Array); + * // => true + * + * _.isTypedArray([]); + * // => false + */ + var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray; + + /** + * Converts `value` to an array. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Lang + * @param {*} value The value to convert. + * @returns {Array} Returns the converted array. + * @example + * + * _.toArray({ 'a': 1, 'b': 2 }); + * // => [1, 2] + * + * _.toArray('abc'); + * // => ['a', 'b', 'c'] + * + * _.toArray(1); + * // => [] + * + * _.toArray(null); + * // => [] + */ + function toArray(value) { + if (!value) { + return []; + } + if (isArrayLike(value)) { + return isString(value) ? stringToArray(value) : copyArray(value); + } + if (symIterator && value[symIterator]) { + return iteratorToArray(value[symIterator]()); + } + var tag = getTag(value), + func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values); + + return func(value); + } + + /** + * Converts `value` to a finite number. + * + * @static + * @memberOf _ + * @since 4.12.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {number} Returns the converted number. + * @example + * + * _.toFinite(3.2); + * // => 3.2 + * + * _.toFinite(Number.MIN_VALUE); + * // => 5e-324 + * + * _.toFinite(Infinity); + * // => 1.7976931348623157e+308 + * + * _.toFinite('3.2'); + * // => 3.2 + */ + function toFinite(value) { + if (!value) { + return value === 0 ? value : 0; + } + value = toNumber(value); + if (value === INFINITY || value === -INFINITY) { + var sign = (value < 0 ? -1 : 1); + return sign * MAX_INTEGER; + } + return value === value ? value : 0; + } + + /** + * Converts `value` to an integer. + * + * **Note:** This method is loosely based on + * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger). + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {number} Returns the converted integer. + * @example + * + * _.toInteger(3.2); + * // => 3 + * + * _.toInteger(Number.MIN_VALUE); + * // => 0 + * + * _.toInteger(Infinity); + * // => 1.7976931348623157e+308 + * + * _.toInteger('3.2'); + * // => 3 + */ + function toInteger(value) { + var result = toFinite(value), + remainder = result % 1; + + return result === result ? (remainder ? result - remainder : result) : 0; + } + + /** + * Converts `value` to a number. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to process. + * @returns {number} Returns the number. + * @example + * + * _.toNumber(3.2); + * // => 3.2 + * + * _.toNumber(Number.MIN_VALUE); + * // => 5e-324 + * + * _.toNumber(Infinity); + * // => Infinity + * + * _.toNumber('3.2'); + * // => 3.2 + */ + function toNumber(value) { + if (typeof value == 'number') { return value; } + if (isSymbol(value)) { + return NAN; + } + if (isObject(value)) { + var other = typeof value.valueOf == 'function' ? value.valueOf() : value; + value = isObject(other) ? (other + '') : other; + } + if (typeof value != 'string') { + return value === 0 ? value : +value; + } + value = value.replace(reTrim, ''); + var isBinary = reIsBinary.test(value); + return (isBinary || reIsOctal.test(value)) + ? freeParseInt(value.slice(2), isBinary ? 2 : 8) + : (reIsBadHex.test(value) ? NAN : +value); + } - /** - * Adds functions properties of `object` to the `lodash` function and chainable - * wrapper. - * - * @static - * @memberOf _ - * @category Utilities - * @param {Object} object The object of function properties to add to `lodash`. - * @example - * - * _.mixin({ - * 'capitalize': function(string) { - * return string.charAt(0).toUpperCase() + string.slice(1).toLowerCase(); - * } - * }); - * - * _.capitalize('moe'); - * // => 'Moe' - * - * _('moe').capitalize(); - * // => 'Moe' - */ - function mixin(object) { - forEach(functions(object), function(methodName) { - var func = lodash[methodName] = object[methodName]; + /** + * Converts `value` to a plain object flattening inherited enumerable string + * keyed properties of `value` to own properties of the plain object. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {Object} Returns the converted plain object. + * @example + * + * function Foo() { + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.assign({ 'a': 1 }, new Foo); + * // => { 'a': 1, 'b': 2 } + * + * _.assign({ 'a': 1 }, _.toPlainObject(new Foo)); + * // => { 'a': 1, 'b': 2, 'c': 3 } + */ + function toPlainObject(value) { + return copyObject(value, keysIn(value)); + } - lodash.prototype[methodName] = function() { - var value = this.__wrapped__, - args = [value]; + /** + * Converts `value` to a string. An empty string is returned for `null` + * and `undefined` values. The sign of `-0` is preserved. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Lang + * @param {*} value The value to convert. + * @returns {string} Returns the converted string. + * @example + * + * _.toString(null); + * // => '' + * + * _.toString(-0); + * // => '-0' + * + * _.toString([1, 2, 3]); + * // => '1,2,3' + */ + function toString(value) { + return value == null ? '' : baseToString(value); + } - push.apply(args, arguments); - var result = func.apply(lodash, args); - return (value && typeof value == 'object' && value === result) - ? this - : new lodashWrapper(result); + /*------------------------------------------------------------------------*/ + + /** + * This method is like `_.assign` except that it iterates over own and + * inherited source properties. + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @alias extend + * @category Object + * @param {Object} object The destination object. + * @param {...Object} [sources] The source objects. + * @returns {Object} Returns `object`. + * @see _.assign + * @example + * + * function Foo() { + * this.a = 1; + * } + * + * function Bar() { + * this.c = 3; + * } + * + * Foo.prototype.b = 2; + * Bar.prototype.d = 4; + * + * _.assignIn({ 'a': 0 }, new Foo, new Bar); + * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 } + */ + var assignIn = createAssigner(function(object, source) { + copyObject(source, keysIn(source), object); + }); + + /** + * Gets the value at `path` of `object`. If the resolved value is + * `undefined`, the `defaultValue` is returned in its place. + * + * @static + * @memberOf _ + * @since 3.7.0 + * @category Object + * @param {Object} object The object to query. + * @param {Array|string} path The path of the property to get. + * @param {*} [defaultValue] The value returned for `undefined` resolved values. + * @returns {*} Returns the resolved value. + * @example + * + * var object = { 'a': [{ 'b': { 'c': 3 } }] }; + * + * _.get(object, 'a[0].b.c'); + * // => 3 + * + * _.get(object, ['a', '0', 'b', 'c']); + * // => 3 + * + * _.get(object, 'a.b.c', 'default'); + * // => 'default' + */ + function get(object, path, defaultValue) { + var result = object == null ? undefined : baseGet(object, path); + return result === undefined ? defaultValue : result; + } + + /** + * Checks if `path` is a direct or inherited property of `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The object to query. + * @param {Array|string} path The path to check. + * @returns {boolean} Returns `true` if `path` exists, else `false`. + * @example + * + * var object = _.create({ 'a': _.create({ 'b': 2 }) }); + * + * _.hasIn(object, 'a'); + * // => true + * + * _.hasIn(object, 'a.b'); + * // => true + * + * _.hasIn(object, ['a', 'b']); + * // => true + * + * _.hasIn(object, 'b'); + * // => false + */ + function hasIn(object, path) { + return object != null && hasPath(object, path, baseHasIn); + } + + /** + * Invokes the method at `path` of `object`. + * + * @static + * @memberOf _ + * @since 4.0.0 + * @category Object + * @param {Object} object The object to query. + * @param {Array|string} path The path of the method to invoke. + * @param {...*} [args] The arguments to invoke the method with. + * @returns {*} Returns the result of the invoked method. + * @example + * + * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] }; + * + * _.invoke(object, 'a[0].b.c.slice', 1, 3); + * // => [2, 3] + */ + var invoke = baseRest(baseInvoke); + + /** + * Creates an array of the own enumerable property names of `object`. + * + * **Note:** Non-object values are coerced to objects. See the + * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys) + * for more details. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.keys(new Foo); + * // => ['a', 'b'] (iteration order is not guaranteed) + * + * _.keys('hi'); + * // => ['0', '1'] + */ + function keys(object) { + return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object); + } + + /** + * Creates an array of the own and inherited enumerable property names of `object`. + * + * **Note:** Non-object values are coerced to objects. + * + * @static + * @memberOf _ + * @since 3.0.0 + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property names. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.keysIn(new Foo); + * // => ['a', 'b', 'c'] (iteration order is not guaranteed) + */ + function keysIn(object) { + return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object); + } + + /** + * This method is like `_.assign` except that it recursively merges own and + * inherited enumerable string keyed properties of source objects into the + * destination object. Source properties that resolve to `undefined` are + * skipped if a destination value exists. Array and plain object properties + * are merged recursively. Other objects and value types are overridden by + * assignment. Source objects are applied from left to right. Subsequent + * sources overwrite property assignments of previous sources. + * + * **Note:** This method mutates `object`. + * + * @static + * @memberOf _ + * @since 0.5.0 + * @category Object + * @param {Object} object The destination object. + * @param {...Object} [sources] The source objects. + * @returns {Object} Returns `object`. + * @example + * + * var object = { + * 'a': [{ 'b': 2 }, { 'd': 4 }] + * }; + * + * var other = { + * 'a': [{ 'c': 3 }, { 'e': 5 }] + * }; + * + * _.merge(object, other); + * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] } + */ + var merge = createAssigner(function(object, source, srcIndex) { + baseMerge(object, source, srcIndex); + }); + + /** + * The opposite of `_.pick`; this method creates an object composed of the + * own and inherited enumerable property paths of `object` that are not omitted. + * + * **Note:** This method is considerably slower than `_.pick`. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The source object. + * @param {...(string|string[])} [paths] The property paths to omit. + * @returns {Object} Returns the new object. + * @example + * + * var object = { 'a': 1, 'b': '2', 'c': 3 }; + * + * _.omit(object, ['a', 'c']); + * // => { 'b': '2' } + */ + var omit = flatRest(function(object, paths) { + var result = {}; + if (object == null) { + return result; + } + var isDeep = false; + paths = arrayMap(paths, function(path) { + path = castPath(path, object); + isDeep || (isDeep = path.length > 1); + return path; + }); + copyObject(object, getAllKeysIn(object), result); + if (isDeep) { + result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone); + } + var length = paths.length; + while (length--) { + baseUnset(result, paths[length]); + } + return result; + }); + + /** + * Creates an object composed of the picked `object` properties. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The source object. + * @param {...(string|string[])} [paths] The property paths to pick. + * @returns {Object} Returns the new object. + * @example + * + * var object = { 'a': 1, 'b': '2', 'c': 3 }; + * + * _.pick(object, ['a', 'c']); + * // => { 'a': 1, 'c': 3 } + */ + var pick = flatRest(function(object, paths) { + return object == null ? {} : basePick(object, paths); + }); + + /** + * Creates an array of the own enumerable string keyed property values of `object`. + * + * **Note:** Non-object values are coerced to objects. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Object + * @param {Object} object The object to query. + * @returns {Array} Returns the array of property values. + * @example + * + * function Foo() { + * this.a = 1; + * this.b = 2; + * } + * + * Foo.prototype.c = 3; + * + * _.values(new Foo); + * // => [1, 2] (iteration order is not guaranteed) + * + * _.values('hi'); + * // => ['h', 'i'] + */ + function values(object) { + return object == null ? [] : baseValues(object, keys(object)); + } + + /*------------------------------------------------------------------------*/ + + /** + * Creates a function that returns `value`. + * + * @static + * @memberOf _ + * @since 2.4.0 + * @category Util + * @param {*} value The value to return from the new function. + * @returns {Function} Returns the new constant function. + * @example + * + * var objects = _.times(2, _.constant({ 'a': 1 })); + * + * console.log(objects); + * // => [{ 'a': 1 }, { 'a': 1 }] + * + * console.log(objects[0] === objects[1]); + * // => true + */ + function constant(value) { + return function() { + return value; + }; + } + + /** + * This method returns the first argument it receives. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Util + * @param {*} value Any value. + * @returns {*} Returns `value`. + * @example + * + * var object = { 'a': 1 }; + * + * console.log(_.identity(object) === object); + * // => true + */ + function identity(value) { + return value; + } + + /** + * Creates a function that invokes `func` with the arguments of the created + * function. If `func` is a property name, the created function returns the + * property value for a given element. If `func` is an array or object, the + * created function returns `true` for elements that contain the equivalent + * source properties, otherwise it returns `false`. + * + * @static + * @since 4.0.0 + * @memberOf _ + * @category Util + * @param {*} [func=_.identity] The value to convert to a callback. + * @returns {Function} Returns the callback. + * @example + * + * var users = [ + * { 'user': 'barney', 'age': 36, 'active': true }, + * { 'user': 'fred', 'age': 40, 'active': false } + * ]; + * + * // The `_.matches` iteratee shorthand. + * _.filter(users, _.iteratee({ 'user': 'barney', 'active': true })); + * // => [{ 'user': 'barney', 'age': 36, 'active': true }] + * + * // The `_.matchesProperty` iteratee shorthand. + * _.filter(users, _.iteratee(['user', 'fred'])); + * // => [{ 'user': 'fred', 'age': 40 }] + * + * // The `_.property` iteratee shorthand. + * _.map(users, _.iteratee('user')); + * // => ['barney', 'fred'] + * + * // Create custom iteratee shorthands. + * _.iteratee = _.wrap(_.iteratee, function(iteratee, func) { + * return !_.isRegExp(func) ? iteratee(func) : function(string) { + * return func.test(string); + * }; + * }); + * + * _.filter(['abc', 'def'], /ef/); + * // => ['def'] + */ + function iteratee(func) { + return baseIteratee(typeof func == 'function' ? func : baseClone(func, CLONE_DEEP_FLAG)); + } + + /** + * Adds all own enumerable string keyed function properties of a source + * object to the destination object. If `object` is a function, then methods + * are added to its prototype as well. + * + * **Note:** Use `_.runInContext` to create a pristine `lodash` function to + * avoid conflicts caused by modifying the original. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Util + * @param {Function|Object} [object=lodash] The destination object. + * @param {Object} source The object of functions to add. + * @param {Object} [options={}] The options object. + * @param {boolean} [options.chain=true] Specify whether mixins are chainable. + * @returns {Function|Object} Returns `object`. + * @example + * + * function vowels(string) { + * return _.filter(string, function(v) { + * return /[aeiou]/i.test(v); + * }); + * } + * + * _.mixin({ 'vowels': vowels }); + * _.vowels('fred'); + * // => ['e'] + * + * _('fred').vowels().value(); + * // => ['e'] + * + * _.mixin({ 'vowels': vowels }, { 'chain': false }); + * _('fred').vowels(); + * // => ['e'] + */ + function mixin(object, source, options) { + var props = keys(source), + methodNames = baseFunctions(source, props); + + if (options == null && + !(isObject(source) && (methodNames.length || !props.length))) { + options = source; + source = object; + object = this; + methodNames = baseFunctions(source, keys(source)); + } + var chain = !(isObject(options) && 'chain' in options) || !!options.chain, + isFunc = isFunction(object); + + arrayEach(methodNames, function(methodName) { + var func = source[methodName]; + object[methodName] = func; + if (isFunc) { + object.prototype[methodName] = function() { + var chainAll = this.__chain__; + if (chain || chainAll) { + var result = object(this.__wrapped__), + actions = result.__actions__ = copyArray(this.__actions__); + + actions.push({ 'func': func, 'args': arguments, 'thisArg': object }); + result.__chain__ = chainAll; + return result; + } + return func.apply(object, arrayPush([this.value()], arguments)); }; - }); - } + } + }); - /** - * Reverts the '_' variable to its previous value and returns a reference to - * the `lodash` function. - * - * @static - * @memberOf _ - * @category Utilities - * @returns {Function} Returns the `lodash` function. - * @example - * - * var lodash = _.noConflict(); - */ - function noConflict() { - context._ = oldDash; - return this; - } + return object; + } - /** - * Converts the given `value` into an integer of the specified `radix`. - * If `radix` is `undefined` or `0`, a `radix` of `10` is used unless the - * `value` is a hexadecimal, in which case a `radix` of `16` is used. - * - * Note: This method avoids differences in native ES3 and ES5 `parseInt` - * implementations. See http://es5.github.com/#E. - * - * @static - * @memberOf _ - * @category Utilities - * @param {String} value The value to parse. - * @param {Number} [radix] The radix used to interpret the value to parse. - * @returns {Number} Returns the new integer value. - * @example - * - * _.parseInt('08'); - * // => 8 - */ - var parseInt = nativeParseInt(whitespace + '08') == 8 ? nativeParseInt : function(value, radix) { - // Firefox and Opera still follow the ES3 specified implementation of `parseInt` - return nativeParseInt(isString(value) ? value.replace(reLeadingSpacesAndZeros, '') : value, radix || 0); + /** + * This method returns `undefined`. + * + * @static + * @memberOf _ + * @since 2.3.0 + * @category Util + * @example + * + * _.times(2, _.noop); + * // => [undefined, undefined] + */ + function noop() { + // No operation performed. + } + + /** + * Creates a function that returns the value at `path` of a given object. + * + * @static + * @memberOf _ + * @since 2.4.0 + * @category Util + * @param {Array|string} path The path of the property to get. + * @returns {Function} Returns the new accessor function. + * @example + * + * var objects = [ + * { 'a': { 'b': 2 } }, + * { 'a': { 'b': 1 } } + * ]; + * + * _.map(objects, _.property('a.b')); + * // => [2, 1] + * + * _.map(_.sortBy(objects, _.property(['a', 'b'])), 'a.b'); + * // => [1, 2] + */ + function property(path) { + return isKey(path) ? baseProperty(toKey(path)) : basePropertyDeep(path); + } + + /** + * Creates an array of numbers (positive and/or negative) progressing from + * `start` up to, but not including, `end`. A step of `-1` is used if a negative + * `start` is specified without an `end` or `step`. If `end` is not specified, + * it's set to `start` with `start` then set to `0`. + * + * **Note:** JavaScript follows the IEEE-754 standard for resolving + * floating-point values which can produce unexpected results. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Util + * @param {number} [start=0] The start of the range. + * @param {number} end The end of the range. + * @param {number} [step=1] The value to increment or decrement by. + * @returns {Array} Returns the range of numbers. + * @see _.inRange, _.rangeRight + * @example + * + * _.range(4); + * // => [0, 1, 2, 3] + * + * _.range(-4); + * // => [0, -1, -2, -3] + * + * _.range(1, 5); + * // => [1, 2, 3, 4] + * + * _.range(0, 20, 5); + * // => [0, 5, 10, 15] + * + * _.range(0, -4, -1); + * // => [0, -1, -2, -3] + * + * _.range(1, 4, 0); + * // => [1, 1, 1] + * + * _.range(0); + * // => [] + */ + var range = createRange(); + + /** + * This method returns a new empty array. + * + * @static + * @memberOf _ + * @since 4.13.0 + * @category Util + * @returns {Array} Returns the new empty array. + * @example + * + * var arrays = _.times(2, _.stubArray); + * + * console.log(arrays); + * // => [[], []] + * + * console.log(arrays[0] === arrays[1]); + * // => false + */ + function stubArray() { + return []; + } + + /** + * This method returns `false`. + * + * @static + * @memberOf _ + * @since 4.13.0 + * @category Util + * @returns {boolean} Returns `false`. + * @example + * + * _.times(2, _.stubFalse); + * // => [false, false] + */ + function stubFalse() { + return false; + } + + /*------------------------------------------------------------------------*/ + + /** + * Computes the maximum value of `array`. If `array` is empty or falsey, + * `undefined` is returned. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Math + * @param {Array} array The array to iterate over. + * @returns {*} Returns the maximum value. + * @example + * + * _.max([4, 2, 8, 6]); + * // => 8 + * + * _.max([]); + * // => undefined + */ + function max(array) { + return (array && array.length) + ? baseExtremum(array, identity, baseGt) + : undefined; + } + + /** + * Computes the minimum value of `array`. If `array` is empty or falsey, + * `undefined` is returned. + * + * @static + * @since 0.1.0 + * @memberOf _ + * @category Math + * @param {Array} array The array to iterate over. + * @returns {*} Returns the minimum value. + * @example + * + * _.min([4, 2, 8, 6]); + * // => 2 + * + * _.min([]); + * // => undefined + */ + function min(array) { + return (array && array.length) + ? baseExtremum(array, identity, baseLt) + : undefined; + } + + /*------------------------------------------------------------------------*/ + + // Add methods that return wrapped values in chain sequences. + lodash.assignIn = assignIn; + lodash.chain = chain; + lodash.compact = compact; + lodash.constant = constant; + lodash.debounce = debounce; + lodash.delay = delay; + lodash.filter = filter; + lodash.flatten = flatten; + lodash.intersection = intersection; + lodash.iteratee = iteratee; + lodash.keys = keys; + lodash.keysIn = keysIn; + lodash.map = map; + lodash.memoize = memoize; + lodash.merge = merge; + lodash.mixin = mixin; + lodash.negate = negate; + lodash.omit = omit; + lodash.pick = pick; + lodash.property = property; + lodash.range = range; + lodash.reject = reject; + lodash.reverse = reverse; + lodash.sortBy = sortBy; + lodash.tap = tap; + lodash.throttle = throttle; + lodash.thru = thru; + lodash.toArray = toArray; + lodash.toPlainObject = toPlainObject; + lodash.union = union; + lodash.uniq = uniq; + lodash.values = values; + lodash.without = without; + + // Add aliases. + lodash.extend = assignIn; + + // Add methods to `lodash.prototype`. + mixin(lodash, lodash); + + /*------------------------------------------------------------------------*/ + + // Add methods that return unwrapped values in chain sequences. + lodash.clone = clone; + lodash.eq = eq; + lodash.every = every; + lodash.forEach = forEach; + lodash.get = get; + lodash.hasIn = hasIn; + lodash.head = head; + lodash.identity = identity; + lodash.invoke = invoke; + lodash.isArguments = isArguments; + lodash.isArray = isArray; + lodash.isArrayLike = isArrayLike; + lodash.isArrayLikeObject = isArrayLikeObject; + lodash.isBuffer = isBuffer; + lodash.isEmpty = isEmpty; + lodash.isEqual = isEqual; + lodash.isFunction = isFunction; + lodash.isLength = isLength; + lodash.isMap = isMap; + lodash.isObject = isObject; + lodash.isObjectLike = isObjectLike; + lodash.isPlainObject = isPlainObject; + lodash.isSet = isSet; + lodash.isString = isString; + lodash.isSymbol = isSymbol; + lodash.isTypedArray = isTypedArray; + lodash.last = last; + lodash.max = max; + lodash.min = min; + lodash.stubArray = stubArray; + lodash.stubFalse = stubFalse; + lodash.noop = noop; + lodash.now = now; + lodash.reduce = reduce; + lodash.toFinite = toFinite; + lodash.toInteger = toInteger; + lodash.toNumber = toNumber; + lodash.toString = toString; + + // Add aliases. + lodash.each = forEach; + lodash.first = head; + + mixin(lodash, (function() { + var source = {}; + baseForOwn(lodash, function(func, methodName) { + if (!hasOwnProperty.call(lodash.prototype, methodName)) { + source[methodName] = func; + } + }); + return source; + }()), { 'chain': false }); + + /*------------------------------------------------------------------------*/ + + /** + * The semantic version number. + * + * @static + * @memberOf _ + * @type {string} + */ + lodash.VERSION = VERSION; + + // Add `LazyWrapper` methods for `_.drop` and `_.take` variants. + arrayEach(['drop', 'take'], function(methodName, index) { + LazyWrapper.prototype[methodName] = function(n) { + n = n === undefined ? 1 : nativeMax(toInteger(n), 0); + + var result = (this.__filtered__ && !index) + ? new LazyWrapper(this) + : this.clone(); + + if (result.__filtered__) { + result.__takeCount__ = nativeMin(n, result.__takeCount__); + } else { + result.__views__.push({ + 'size': nativeMin(n, MAX_ARRAY_LENGTH), + 'type': methodName + (result.__dir__ < 0 ? 'Right' : '') + }); + } + return result; }; - /** - * Produces a random number between `min` and `max` (inclusive). If only one - * argument is passed, a number between `0` and the given number will be returned. - * - * @static - * @memberOf _ - * @category Utilities - * @param {Number} [min=0] The minimum possible value. - * @param {Number} [max=1] The maximum possible value. - * @returns {Number} Returns a random number. - * @example - * - * _.random(0, 5); - * // => a number between 0 and 5 - * - * _.random(5); - * // => also a number between 0 and 5 - */ - function random(min, max) { - if (min == null && max == null) { - max = 1; - } - min = +min || 0; - if (max == null) { - max = min; - min = 0; - } else { - max = +max || 0; - } - var rand = nativeRandom(); - return (min % 1 || max % 1) - ? min + nativeMin(rand * (max - min + parseFloat('1e-' + ((rand +'').length - 1))), max) - : min + floor(rand * (max - min + 1)); - } + LazyWrapper.prototype[methodName + 'Right'] = function(n) { + return this.reverse()[methodName](n).reverse(); + }; + }); - /** - * Resolves the value of `property` on `object`. If `property` is a function, - * it will be invoked with the `this` binding of `object` and its result returned, - * else the property value is returned. If `object` is falsey, then `undefined` - * is returned. - * - * @static - * @memberOf _ - * @category Utilities - * @param {Object} object The object to inspect. - * @param {String} property The property to get the value of. - * @returns {Mixed} Returns the resolved value. - * @example - * - * var object = { - * 'cheese': 'crumpets', - * 'stuff': function() { - * return 'nonsense'; - * } - * }; - * - * _.result(object, 'cheese'); - * // => 'crumpets' - * - * _.result(object, 'stuff'); - * // => 'nonsense' - */ - function result(object, property) { - var value = object ? object[property] : undefined; - return isFunction(value) ? object[property]() : value; - } + // Add `LazyWrapper` methods that accept an `iteratee` value. + arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) { + var type = index + 1, + isFilter = type == LAZY_FILTER_FLAG || type == LAZY_WHILE_FLAG; - /** - * Executes the `callback` function `n` times, returning an array of the results - * of each `callback` execution. The `callback` is bound to `thisArg` and invoked - * with one argument; (index). - * - * @static - * @memberOf _ - * @category Utilities - * @param {Number} n The number of times to execute the callback. - * @param {Function} callback The function called per iteration. - * @param {Mixed} [thisArg] The `this` binding of `callback`. - * @returns {Array} Returns a new array of the results of each `callback` execution. - * @example - * - * var diceRolls = _.times(3, _.partial(_.random, 1, 6)); - * // => [3, 6, 4] - * - * _.times(3, function(n) { mage.castSpell(n); }); - * // => calls `mage.castSpell(n)` three times, passing `n` of `0`, `1`, and `2` respectively - * - * _.times(3, function(n) { this.cast(n); }, mage); - * // => also calls `mage.castSpell(n)` three times - */ - function times(n, callback, thisArg) { - n = (n = +n) > -1 ? n : 0; - var index = -1, - result = Array(n); - - callback = lodash.createCallback(callback, thisArg, 1); - while (++index < n) { - result[index] = callback(index); - } - return result; - } - - /** - * The inverse of `_.escape`, this method converts the HTML entities - * `&`, `<`, `>`, `"`, and `'` in `string` to their - * corresponding characters. - * - * @static - * @memberOf _ - * @category Utilities - * @param {String} string The string to unescape. - * @returns {String} Returns the unescaped string. - * @example - * - * _.unescape('Moe, Larry & Curly'); - * // => 'Moe, Larry & Curly' - */ - function unescape(string) { - return string == null ? '' : String(string).replace(reEscapedHtml, unescapeHtmlChar); - } - - /** - * Generates a unique ID. If `prefix` is passed, the ID will be appended to it. - * - * @static - * @memberOf _ - * @category Utilities - * @param {String} [prefix] The value to prefix the ID with. - * @returns {String} Returns the unique ID. - * @example - * - * _.uniqueId('contact_'); - * // => 'contact_104' - * - * _.uniqueId(); - * // => '105' - */ - function uniqueId(prefix) { - var id = ++idCounter; - return String(prefix == null ? '' : prefix) + id; - } - - /*--------------------------------------------------------------------------*/ - - /** - * Invokes `interceptor` with the `value` as the first argument, and then - * returns `value`. The purpose of this method is to "tap into" a method chain, - * in order to perform operations on intermediate results within the chain. - * - * @static - * @memberOf _ - * @category Chaining - * @param {Mixed} value The value to pass to `interceptor`. - * @param {Function} interceptor The function to invoke. - * @returns {Mixed} Returns `value`. - * @example - * - * _([1, 2, 3, 4]) - * .filter(function(num) { return num % 2 == 0; }) - * .tap(alert) - * .map(function(num) { return num * num; }) - * .value(); - * // => // [2, 4] (alerted) - * // => [4, 16] - */ - function tap(value, interceptor) { - interceptor(value); - return value; - } - - /** - * Produces the `toString` result of the wrapped value. - * - * @name toString - * @memberOf _ - * @category Chaining - * @returns {String} Returns the string result. - * @example - * - * _([1, 2, 3]).toString(); - * // => '1,2,3' - */ - function wrapperToString() { - return String(this.__wrapped__); - } - - /** - * Extracts the wrapped value. - * - * @name valueOf - * @memberOf _ - * @alias value - * @category Chaining - * @returns {Mixed} Returns the wrapped value. - * @example - * - * _([1, 2, 3]).valueOf(); - * // => [1, 2, 3] - */ - function wrapperValueOf() { - return this.__wrapped__; - } - - /*--------------------------------------------------------------------------*/ - - // add functions that return wrapped values when chaining - lodash.after = after; - lodash.assign = assign; - lodash.at = at; - lodash.bind = bind; - lodash.bindAll = bindAll; - lodash.bindKey = bindKey; - lodash.compact = compact; - lodash.compose = compose; - lodash.countBy = countBy; - lodash.createCallback = createCallback; - lodash.debounce = debounce; - lodash.defaults = defaults; - lodash.defer = defer; - lodash.delay = delay; - lodash.difference = difference; - lodash.filter = filter; - lodash.flatten = flatten; - lodash.forEach = forEach; - lodash.forIn = forIn; - lodash.forOwn = forOwn; - lodash.functions = functions; - lodash.groupBy = groupBy; - lodash.initial = initial; - lodash.intersection = intersection; - lodash.invert = invert; - lodash.invoke = invoke; - lodash.keys = keys; - lodash.map = map; - lodash.max = max; - lodash.memoize = memoize; - lodash.merge = merge; - lodash.min = min; - lodash.omit = omit; - lodash.once = once; - lodash.pairs = pairs; - lodash.partial = partial; - lodash.partialRight = partialRight; - lodash.pick = pick; - lodash.pluck = pluck; - lodash.range = range; - lodash.reject = reject; - lodash.rest = rest; - lodash.shuffle = shuffle; - lodash.sortBy = sortBy; - lodash.tap = tap; - lodash.throttle = throttle; - lodash.times = times; - lodash.toArray = toArray; - lodash.transform = transform; - lodash.union = union; - lodash.uniq = uniq; - lodash.unzip = unzip; - lodash.values = values; - lodash.where = where; - lodash.without = without; - lodash.wrap = wrap; - lodash.zip = zip; - lodash.zipObject = zipObject; - - // add aliases - lodash.collect = map; - lodash.drop = rest; - lodash.each = forEach; - lodash.extend = assign; - lodash.methods = functions; - lodash.object = zipObject; - lodash.select = filter; - lodash.tail = rest; - lodash.unique = uniq; - - // add functions to `lodash.prototype` - mixin(lodash); - - // add Underscore compat - lodash.chain = lodash; - lodash.prototype.chain = function() { return this; }; - - /*--------------------------------------------------------------------------*/ - - // add functions that return unwrapped values when chaining - lodash.clone = clone; - lodash.cloneDeep = cloneDeep; - lodash.contains = contains; - lodash.escape = escape; - lodash.every = every; - lodash.find = find; - lodash.findIndex = findIndex; - lodash.findKey = findKey; - lodash.has = has; - lodash.identity = identity; - lodash.indexOf = indexOf; - lodash.isArguments = isArguments; - lodash.isArray = isArray; - lodash.isBoolean = isBoolean; - lodash.isDate = isDate; - lodash.isElement = isElement; - lodash.isEmpty = isEmpty; - lodash.isEqual = isEqual; - lodash.isFinite = isFinite; - lodash.isFunction = isFunction; - lodash.isNaN = isNaN; - lodash.isNull = isNull; - lodash.isNumber = isNumber; - lodash.isObject = isObject; - lodash.isPlainObject = isPlainObject; - lodash.isRegExp = isRegExp; - lodash.isString = isString; - lodash.isUndefined = isUndefined; - lodash.lastIndexOf = lastIndexOf; - lodash.mixin = mixin; - lodash.noConflict = noConflict; - lodash.parseInt = parseInt; - lodash.random = random; - lodash.reduce = reduce; - lodash.reduceRight = reduceRight; - lodash.result = result; - lodash.runInContext = runInContext; - lodash.size = size; - lodash.some = some; - lodash.sortedIndex = sortedIndex; - lodash.unescape = unescape; - lodash.uniqueId = uniqueId; - - // add aliases - lodash.all = every; - lodash.any = some; - lodash.detect = find; - lodash.findWhere = find; - lodash.foldl = reduce; - lodash.foldr = reduceRight; - lodash.include = contains; - lodash.inject = reduce; - - forOwn(lodash, function(func, methodName) { - if (!lodash.prototype[methodName]) { - lodash.prototype[methodName] = function() { - var args = [this.__wrapped__]; - push.apply(args, arguments); - return func.apply(lodash, args); - }; - } - }); - - /*--------------------------------------------------------------------------*/ - - // add functions capable of returning wrapped and unwrapped values when chaining - lodash.first = first; - lodash.last = last; - - // add aliases - lodash.take = first; - lodash.head = first; - - forOwn(lodash, function(func, methodName) { - if (!lodash.prototype[methodName]) { - lodash.prototype[methodName]= function(callback, thisArg) { - var result = func(this.__wrapped__, callback, thisArg); - return callback == null || (thisArg && typeof callback != 'function') - ? result - : new lodashWrapper(result); - }; - } - }); - - /*--------------------------------------------------------------------------*/ - - /** - * The semantic version number. - * - * @static - * @memberOf _ - * @type String - */ - lodash.VERSION = '1.3.0'; - - // add "Chaining" functions to the wrapper - lodash.prototype.toString = wrapperToString; - lodash.prototype.value = wrapperValueOf; - lodash.prototype.valueOf = wrapperValueOf; - - // add `Array` functions that return unwrapped values - basicEach(['join', 'pop', 'shift'], function(methodName) { - var func = arrayRef[methodName]; - lodash.prototype[methodName] = function() { - return func.apply(this.__wrapped__, arguments); - }; - }); - - // add `Array` functions that return the wrapped value - basicEach(['push', 'reverse', 'sort', 'unshift'], function(methodName) { - var func = arrayRef[methodName]; - lodash.prototype[methodName] = function() { - func.apply(this.__wrapped__, arguments); - return this; - }; - }); - - // add `Array` functions that return new wrapped values - basicEach(['concat', 'slice', 'splice'], function(methodName) { - var func = arrayRef[methodName]; - lodash.prototype[methodName] = function() { - return new lodashWrapper(func.apply(this.__wrapped__, arguments)); - }; - }); - - // avoid array-like object bugs with `Array#shift` and `Array#splice` - // in Firefox < 10 and IE < 9 - if (!support.spliceObjects) { - basicEach(['pop', 'shift', 'splice'], function(methodName) { - var func = arrayRef[methodName], - isSplice = methodName == 'splice'; - - lodash.prototype[methodName] = function() { - var value = this.__wrapped__, - result = func.apply(value, arguments); - - if (value.length === 0) { - delete value[0]; - } - return isSplice ? new lodashWrapper(result) : result; - }; + LazyWrapper.prototype[methodName] = function(iteratee) { + var result = this.clone(); + result.__iteratees__.push({ + 'iteratee': getIteratee(iteratee, 3), + 'type': type }); - } + result.__filtered__ = result.__filtered__ || isFilter; + return result; + }; + }); - return lodash; + // Add `LazyWrapper` methods for `_.head` and `_.last`. + arrayEach(['head', 'last'], function(methodName, index) { + var takeName = 'take' + (index ? 'Right' : ''); + + LazyWrapper.prototype[methodName] = function() { + return this[takeName](1).value()[0]; + }; + }); + + // Add `LazyWrapper` methods for `_.initial` and `_.tail`. + arrayEach(['initial', 'tail'], function(methodName, index) { + var dropName = 'drop' + (index ? '' : 'Right'); + + LazyWrapper.prototype[methodName] = function() { + return this.__filtered__ ? new LazyWrapper(this) : this[dropName](1); + }; + }); + + LazyWrapper.prototype.compact = function() { + return this.filter(identity); + }; + + LazyWrapper.prototype.find = function(predicate) { + return this.filter(predicate).head(); + }; + + LazyWrapper.prototype.findLast = function(predicate) { + return this.reverse().find(predicate); + }; + + LazyWrapper.prototype.invokeMap = baseRest(function(path, args) { + if (typeof path == 'function') { + return new LazyWrapper(this); + } + return this.map(function(value) { + return baseInvoke(value, path, args); + }); + }); + + LazyWrapper.prototype.reject = function(predicate) { + return this.filter(negate(getIteratee(predicate))); + }; + + LazyWrapper.prototype.slice = function(start, end) { + start = toInteger(start); + + var result = this; + if (result.__filtered__ && (start > 0 || end < 0)) { + return new LazyWrapper(result); + } + if (start < 0) { + result = result.takeRight(-start); + } else if (start) { + result = result.drop(start); + } + if (end !== undefined) { + end = toInteger(end); + result = end < 0 ? result.dropRight(-end) : result.take(end - start); + } + return result; + }; + + LazyWrapper.prototype.takeRightWhile = function(predicate) { + return this.reverse().takeWhile(predicate).reverse(); + }; + + LazyWrapper.prototype.toArray = function() { + return this.take(MAX_ARRAY_LENGTH); + }; + + // Add `LazyWrapper` methods to `lodash.prototype`. + baseForOwn(LazyWrapper.prototype, function(func, methodName) { + var checkIteratee = /^(?:filter|find|map|reject)|While$/.test(methodName), + isTaker = /^(?:head|last)$/.test(methodName), + lodashFunc = lodash[isTaker ? ('take' + (methodName == 'last' ? 'Right' : '')) : methodName], + retUnwrapped = isTaker || /^find/.test(methodName); + + if (!lodashFunc) { + return; + } + lodash.prototype[methodName] = function() { + var value = this.__wrapped__, + args = isTaker ? [1] : arguments, + isLazy = value instanceof LazyWrapper, + iteratee = args[0], + useLazy = isLazy || isArray(value); + + var interceptor = function(value) { + var result = lodashFunc.apply(lodash, arrayPush([value], args)); + return (isTaker && chainAll) ? result[0] : result; + }; + + if (useLazy && checkIteratee && typeof iteratee == 'function' && iteratee.length != 1) { + // Avoid lazy use if the iteratee has a "length" value other than `1`. + isLazy = useLazy = false; + } + var chainAll = this.__chain__, + isHybrid = !!this.__actions__.length, + isUnwrapped = retUnwrapped && !chainAll, + onlyLazy = isLazy && !isHybrid; + + if (!retUnwrapped && useLazy) { + value = onlyLazy ? value : new LazyWrapper(this); + var result = func.apply(value, args); + result.__actions__.push({ 'func': thru, 'args': [interceptor], 'thisArg': undefined }); + return new LodashWrapper(result, chainAll); + } + if (isUnwrapped && onlyLazy) { + return func.apply(this, args); + } + result = this.thru(interceptor); + return isUnwrapped ? (isTaker ? result.value()[0] : result.value()) : result; + }; + }); + + // Add `Array` methods to `lodash.prototype`. + arrayEach(['pop', 'push', 'shift', 'sort', 'splice', 'unshift'], function(methodName) { + var func = arrayProto[methodName], + chainName = /^(?:push|sort|unshift)$/.test(methodName) ? 'tap' : 'thru', + retUnwrapped = /^(?:pop|shift)$/.test(methodName); + + lodash.prototype[methodName] = function() { + var args = arguments; + if (retUnwrapped && !this.__chain__) { + var value = this.value(); + return func.apply(isArray(value) ? value : [], args); + } + return this[chainName](function(value) { + return func.apply(isArray(value) ? value : [], args); + }); + }; + }); + + // Map minified method names to their real names. + baseForOwn(LazyWrapper.prototype, function(func, methodName) { + var lodashFunc = lodash[methodName]; + if (lodashFunc) { + var key = (lodashFunc.name + ''), + names = realNames[key] || (realNames[key] = []); + + names.push({ 'name': methodName, 'func': lodashFunc }); + } + }); + + realNames[createHybrid(undefined, WRAP_BIND_KEY_FLAG).name] = [{ + 'name': 'wrapper', + 'func': undefined + }]; + + // Add methods to `LazyWrapper`. + LazyWrapper.prototype.clone = lazyClone; + LazyWrapper.prototype.reverse = lazyReverse; + LazyWrapper.prototype.value = lazyValue; + + // Add chain sequence methods to the `lodash` wrapper. + lodash.prototype.chain = wrapperChain; + lodash.prototype.commit = wrapperCommit; + lodash.prototype.next = wrapperNext; + lodash.prototype.plant = wrapperPlant; + lodash.prototype.reverse = wrapperReverse; + lodash.prototype.toJSON = lodash.prototype.valueOf = lodash.prototype.value = wrapperValue; + + // Add lazy aliases. + lodash.prototype.first = lodash.prototype.head; + + if (symIterator) { + lodash.prototype[symIterator] = wrapperToIterator; } /*--------------------------------------------------------------------------*/ - // expose Lo-Dash - var _ = runInContext(); - - // some AMD build optimizers, like r.js, check for specific condition patterns like the following: + // Some AMD build optimizers, like r.js, check for condition patterns like: if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) { - // Expose Lo-Dash to the global object even when an AMD loader is present in - // case Lo-Dash was injected by a third-party script and not intended to be - // loaded as a module. The global assignment can be reverted in the Lo-Dash - // module via its `noConflict()` method. - window._ = _; + // Expose Lodash on the global object to prevent errors when Lodash is + // loaded by a script tag in the presence of an AMD loader. + // See http://requirejs.org/docs/errors.html#mismatch for more details. + // Use `_.noConflict` to remove Lodash from the global object. + root._ = lodash; - // define as an anonymous module so, through path mapping, it can be - // referenced as the "underscore" module + // Define as an anonymous module so, through path mapping, it can be + // referenced as the "underscore" module. define(function() { - return _; + return lodash; }); } - // check for `exports` after `define` in case a build optimizer adds an `exports` object - else if (freeExports && !freeExports.nodeType) { - // in Node.js or RingoJS v0.8.0+ - if (freeModule) { - (freeModule.exports = _)._ = _; - } - // in Narwhal or RingoJS v0.7.0- - else { - freeExports._ = _; - } + // Check for `exports` after `define` in case a build optimizer adds it. + else if (freeModule) { + // Export for Node.js. + (freeModule.exports = lodash)._ = lodash; + // Export for CommonJS support. + freeExports._ = lodash; } else { - // in a browser or Rhino - window._ = _; + // Export to the global object. + root._ = lodash; } -}(this)); +}.call(this));