DEV: Extensively use `startsWith()` (#17540)

app/assets/javascripts/discourse-common/addon/lib/legacy-resolver.js

@@ -194,7 +194,7 @@ export function buildResolver(baseName) {
 
     findConnectorTemplate(parsedName) {
       const full = parsedName.fullNameWithoutType.replace("components/", "");
-      if (full.indexOf("connectors") === 0) {
+      if (full.startsWith("connectors")) {
         return Ember.TEMPLATES[`javascripts/${full}`];
       }
     },
@@ -271,7 +271,7 @@ export function buildResolver(baseName) {
     // (similar to how discourse lays out templates)
     findAdminTemplate(parsedName) {
       let decamelized = decamelize(parsedName.fullNameWithoutType);
-      if (decamelized.indexOf("components") === 0) {
+      if (decamelized.startsWith("components")) {
         let comPath = `admin/templates/${decamelized}`;
         const compTemplate =
           Ember.TEMPLATES[`javascripts/${comPath}`] || Ember.TEMPLATES[comPath];
@@ -285,8 +285,8 @@ export function buildResolver(baseName) {
       }
 
       if (
-        decamelized.indexOf("admin") === 0 ||
+        decamelized.startsWith("admin") ||
-        decamelized.indexOf("javascripts/admin") === 0
+        decamelized.startsWith("javascripts/admin")
       ) {
         decamelized = decamelized.replace(/^admin\_/, "admin/templates/");
         decamelized = decamelized.replace(/^admin\./, "admin/templates/");

app/assets/javascripts/discourse-common/addon/lib/raw-handlebars-helpers.js

@@ -25,7 +25,7 @@ export function registerRawHelpers(hbs, handlebarsClass) {
     let firstContext = options.contexts[0];
     let val = firstContext[context];
 
-    if (context.toString().indexOf("controller.") === 0) {
+    if (context.toString().startsWith("controller.")) {
       context = context.slice(context.indexOf(".") + 1);
     }
 

app/assets/javascripts/discourse/app/components/d-editor.js

@@ -611,8 +611,7 @@ export default Component.extend(TextareaTextManipulation, {
       }
 
       const trimmedPre = sel.pre.trim();
-      const number =
+      const number = sel.value.startsWith(hval)
-        sel.value.indexOf(hval) === 0
         ? sel.value.slice(hlen)
         : `${hval}${sel.value}`;
       const preLines = trimmedPre.length ? `${trimmedPre}\n\n` : "";

app/assets/javascripts/discourse/app/components/share-panel.js

@@ -38,7 +38,7 @@ export default Component.extend({
     }
 
     // Relative urls
-    if (shareUrl.indexOf("/") === 0) {
+    if (shareUrl.startsWith("/")) {
       const location = window.location;
       shareUrl = `${location.protocol}//${location.host}${shareUrl}`;
     }

app/assets/javascripts/discourse/app/controllers/grant-badge.js

@@ -32,7 +32,7 @@ export default Controller.extend(ModalFunctionality, GrantBadgeController, {
     const protocolAndHost =
       window.location.protocol + "//" + window.location.host;
 
-    return url.indexOf("/") === 0 ? protocolAndHost + url : url;
+    return url.startsWith("/") ? protocolAndHost + url : url;
   },
 
   @discourseComputed("saving", "selectedBadgeGrantable")

app/assets/javascripts/discourse/app/lib/cookie.js

@@ -3,7 +3,7 @@ import deprecated from "discourse-common/lib/deprecated";
 const pluses = /\+/g;
 
 function parseCookieValue(s) {
-  if (s.indexOf('"') === 0) {
+  if (s.startsWith('"')) {
     // This is a quoted cookie as according to RFC2068, unescape...
     s = s.slice(1, -1).replace(/\\"/g, '"').replace(/\\\\/g, "\\");
   }

app/assets/javascripts/discourse/app/lib/discourse-location.js

@@ -207,7 +207,7 @@ const DiscourseLocation = EmberObject.extend({
     if (url !== "") {
       rootURL = rootURL.replace(/\/$/, "");
 
-      if (rootURL.length > 0 && url.indexOf(rootURL + "/") === 0) {
+      if (rootURL.length > 0 && url.startsWith(rootURL + "/")) {
         rootURL = "";
       }
     }

app/assets/javascripts/discourse/app/lib/intercept-click.js

@@ -39,7 +39,7 @@ export default function interceptClick(e) {
       !currentTarget.dataset.userCard &&
       currentTarget.classList.contains("ember-view")) ||
     currentTarget.classList.contains("lightbox") ||
-    href.indexOf("mailto:") === 0 ||
+    href.startsWith("mailto:") ||
     (href.match(/^http[s]?:\/\//i) &&
       !href.match(new RegExp("^https?:\\/\\/" + window.location.hostname, "i")))
   ) {

app/assets/javascripts/discourse/app/lib/url.js

@@ -44,7 +44,7 @@ export function rewritePath(path) {
 
   let result = params[0];
   rewrites.forEach((rw) => {
-    if ((rw.opts.exceptions || []).some((ex) => path.indexOf(ex) === 0)) {
+    if ((rw.opts.exceptions || []).some((ex) => path.startsWith(ex))) {
       return;
     }
     result = result.replace(rw.regexp, rw.replacement);
@@ -248,7 +248,7 @@ const DiscourseURL = EmberObject.extend({
     // Rewrite /my/* urls
     let myPath = getURL("/my");
     const fullPath = getURL(path);
-    if (fullPath.indexOf(myPath) === 0) {
+    if (fullPath.startsWith(myPath)) {
       const currentUser = User.current();
       if (currentUser) {
         path = fullPath.replace(
@@ -261,7 +261,7 @@ const DiscourseURL = EmberObject.extend({
     }
 
     // handle prefixes
-    if (path.indexOf("/") === 0) {
+    if (path.startsWith("/")) {
       path = withoutPrefix(path);
     }
 
@@ -318,22 +318,22 @@ const DiscourseURL = EmberObject.extend({
   // Determines whether a URL is internal or not
   isInternal(url) {
     if (url && url.length) {
-      if (url.indexOf("//") === 0) {
+      if (url.startsWith("//")) {
         url = "http:" + url;
       }
-      if (url.indexOf("#") === 0) {
+      if (url.startsWith("#")) {
         return true;
       }
-      if (url.indexOf("/") === 0) {
+      if (url.startsWith("/")) {
         return true;
       }
-      if (url.indexOf(this.origin()) === 0) {
+      if (url.startsWith(this.origin())) {
         return true;
       }
-      if (url.replace(/^http/, "https").indexOf(this.origin()) === 0) {
+      if (url.replace(/^http/, "https").startsWith(this.origin())) {
         return true;
       }
-      if (url.replace(/^https/, "http").indexOf(this.origin()) === 0) {
+      if (url.replace(/^https/, "http").startsWith(this.origin())) {
         return true;
       }
     }
@@ -490,7 +490,7 @@ export function setURLContainer(container) {
 }
 
 export function prefixProtocol(url) {
-  return url.indexOf("://") === -1 && url.indexOf("mailto:") !== 0
+  return url.indexOf("://") === -1 && !url.startsWith("mailto:")
     ? "https://" + url
     : url;
 }

app/assets/javascripts/discourse/app/models/category.js

@@ -584,8 +584,8 @@ Category.reopenClass({
       if (
         ((emptyTerm && !category.get("parent_category_id")) ||
           (!emptyTerm &&
-            (category.get("name").toLowerCase().indexOf(term) === 0 ||
+            (category.get("name").toLowerCase().startsWith(term) ||
-              category.get("slug").toLowerCase().indexOf(slugTerm) === 0))) &&
+              category.get("slug").toLowerCase().startsWith(slugTerm)))) &&
         validCategoryParent(category)
       ) {
         data.push(category);

app/assets/javascripts/discourse/app/models/nav-item.js

@@ -263,7 +263,7 @@ NavItem.reopenClass({
 
         if (
           (category || !args.skipCategoriesNavItem) &&
-          i.name.indexOf("categor") === 0
+          i.name.startsWith("categor")
         ) {
           return false;
         }

app/assets/javascripts/pretty-text/addon/emoji.js

@@ -209,7 +209,7 @@ export function emojiSearch(term, options) {
 
   // if term matches from beginning
   for (const item of toSearch) {
-    if (item.indexOf(term) === 0) {
+    if (item.startsWith(term)) {
       addResult(item);
     }
   }

app/assets/javascripts/pretty-text/addon/sanitizer.js

@@ -121,7 +121,7 @@ export function sanitize(text, allowLister) {
           (forAttr &&
             (forAttr.indexOf("*") !== -1 || forAttr.indexOf(value) !== -1)) ||
           (name.indexOf("data-html-") === -1 &&
-            name.indexOf("data-") === 0 &&
+            name.startsWith("data-") &&
             (forTag["data-*"] || testDataAttribute(forTag, name, value))) ||
           (tag === "a" &&
             name === "href" &&
@@ -129,7 +129,7 @@ export function sanitize(text, allowLister) {
           (tag === "iframe" &&
             name === "src" &&
             allowedIframes.some((i) => {
-              return value.toLowerCase().indexOf((i || "").toLowerCase()) === 0;
+              return value.toLowerCase().startsWith((i || "").toLowerCase());
             }))
         ) {
           return attr(name, value);

app/assets/javascripts/pretty-text/engines/discourse-markdown/quotes.js

@@ -22,12 +22,12 @@ const rule = {
 
       let i;
       for (i = 1; i < split.length; i++) {
-        if (split[i].indexOf("post:") === 0) {
+        if (split[i].startsWith("post:")) {
           postNumber = parseInt(split[i].slice(5), 10);
           continue;
         }
 
-        if (split[i].indexOf("topic:") === 0) {
+        if (split[i].startsWith("topic:")) {
           topicId = parseInt(split[i].slice(6), 10);
           continue;
         }
@@ -39,7 +39,7 @@ const rule = {
 
         // if we have the additional attribute of username: because we are prioritizing full name
         // then assign the name to be the displayName
-        if (split[i].indexOf("username:") === 0) {
+        if (split[i].startsWith("username:")) {
           // return users name by selecting all values from the first index to the post
           // this protects us from when a user has a `,` in their name
           displayName = split.slice(0, split.indexOf(`post:${postNumber}`));

lib/javascripts/widget-hbs-compiler.js

@@ -1,5 +1,5 @@
 function resolve(path) {
-  if (path.indexOf("settings") === 0 || path.indexOf("transformed") === 0) {
+  if (path.startsWith("settings") || path.startsWith("transformed")) {
     return `this.${path}`;
   }
   return path;

public/javascripts/embed.js

@@ -17,7 +17,7 @@
   var queryParams = {};
 
   if (DE.discourseEmbedUrl) {
-    if (DE.discourseEmbedUrl.indexOf("/") === 0) {
+    if (DE.discourseEmbedUrl.startsWith("/")) {
       console.error(
         "discourseEmbedUrl must be a full URL, not a relative path"
       );