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docs(glossary): update Dart to match TS, with minor tweaks to TS (#2868) 

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* docs(glossary): Dart updates and TS tweaks

E.g., add AoT and JiT to Dart.

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21
public/docs/dart/latest/glossary.jade
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@ -19,11 +19,13 @@ block annotation-defn
block bootstrap-defn-top
:marked
We launch an Angular application by "bootstrapping" it with the
[bootstrap][bootstrap] method. The `bootstrap` method identifies an
application's top level "root" [Component](#component) and optionally
You launch an Angular application by "bootstrapping" it with the
[bootstrap][bootstrap] method. Bootstraping identifies an
application's top level "root" [component](#component), which is
the first component that is loaded for the application, and optionally
registers service [providers](#provider) with the [dependency injection
system](#dependency-injection).
For more information, see the [Setup](!{docsLatest}/guide/setup.html) page.
[bootstrap]: !{docsLatest}/api/angular2.platform.browser/bootstrap.html
@ -42,17 +44,6 @@ block module-defn
the chapter on "Libraries and Scripts" in the
[Dart Language Specification](https://www.dartlang.org/docs/spec/).
block routing-component-defn
:marked
A [Component](#component) with an attached router.
In most cases, the component became attached to a [router](#router) by means
of a `@RouterConfig` #{decorator} that defined routes to views controlled by this component.
The component's template has a `RouterOutlet` element where it can display views produced by the router.
It likely has anchor tags or buttons with `RouterLink` directives that users can click to navigate.
block append snake-case-defn
:marked
Library and file names are often spelled in snake_case. Examples include:
@ -63,6 +54,6 @@ block zone-defn
Zones are a mechanism for encapsulating and intercepting
a Dart application's asynchronous activity.
To learn more, consult the [zones article][zones].
Learn more about zones in this [article][zones].
[zones]: https://www.dartlang.org/articles/libraries/zones

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@ -13,7 +13,7 @@ block includes
Most Angular terms are everyday English words
with a specific meaning within the Angular system.
We have gathered here the most prominent terms
This glossary lists the most prominent terms
and a few less familiar ones that have unusual or
unexpected definitions.
@ -23,30 +23,28 @@ block includes
.l-main-section#A
+ifDocsFor('ts')
a#aot
:marked
## Ahead-of-Time (AoT) Compilation
## Ahead-of-Time (AoT) compilation
.l-sub-section
:marked
Angular applications can be compiled by developers at build-time.
By compiling your application using the compiler-cli, `ngc`, you can bootstrap directly
to a Module Factory, meaning you don't need to include the Angular compiler in your javascript bundle.
Ahead-of-time compiled applications also benefit from decreased load time and increased
performance.
You can compile Angular applications at build-time.
By compiling your application<span if-docs="ts"> using the compiler-cli, `ngc`</span>, you can bootstrap directly
to a<span if-docs="ts"> module</span> factory, meaning you don't need to include the Angular compiler in your JavaScript bundle.
Ahead-of-time compiled applications also benefit from decreased load time and increased performance.
+ifDocsFor('ts')
:marked
## Angular Module
## Angular module
.l-sub-section
:marked
Helps us organize an application into cohesive blocks of functionality.
An Angular module identifies the components, directives, and pipes that are used by the application
along with the list of external Angular modules that the application needs, such as `FormsModule`.
Helps you organize an application into cohesive blocks of functionality.
An Angular module identifies the components, directives, and pipes that the application uses along with the list of external Angular modules that the application needs, such as `FormsModule`.
Every Angular application has an application root module class. By convention the class is
called `AppModule` and resides in a file named `app.component.ts`.
Every Angular application has an application root module class. By convention, the class is
called `AppModule` and resides in a file named `app.module.ts`.
See the [Angular Module](!{docsLatest}/guide/ngmodule.html) chapter for details and examples.
For details and examples, see the [Angular Module](!{docsLatest}/guide/ngmodule.html) page.
+ifDocsFor('ts|dart')
:marked
@ -57,15 +55,14 @@ block includes
In practice, a synonym for [Decoration](#decorator).
:marked
## Attribute Directive
## Attribute directive
.l-sub-section
:marked
A category of [Directive](#directive) that can listen to and modify the behavior of
A category of [directive](#directive) that can listen to and modify the behavior of
other HTML elements, attributes, properties, and components. They are usually represented
as HTML attributes, hence the name.
The `ngClass` directive for adding and removing CSS class names is a good example of
an Attribute Directive.
A good example of an attribute directive is the `ngClass` directive for adding and removing CSS class names.
.l-main-section#B
@ -74,7 +71,7 @@ block includes
## Barrel
.l-sub-section
:marked
A barrel is a way to *rollup exports* from several ES2015 modules into a single convenience ES2015 module.
A barrel is a way to *rollup exports* from several ES2015 modules into a single convenient ES2015 module.
The barrel itself is an ES2015 module file that re-exports *selected* exports of other ES2015 modules.
Imagine three ES2015 modules in a `heroes` folder:
@ -94,7 +91,7 @@ block includes
import { Hero } from '../heroes/hero.model.ts';
import { HeroService } from '../heroes/hero.service.ts';
:marked
We can add a barrel to the `heroes` folder (called `index` by convention) that exports all of these items:
You can add a barrel to the `heroes` folder (called `index`, by convention) that exports all of these items:
code-example.
export * from './hero.model.ts'; // re-export all of its exports
export * from './hero.service.ts'; // re-export all of its exports
@ -106,13 +103,9 @@ block includes
:marked
The Angular [scoped packages](#scoped-package) each have a barrel named `index`.
That's why we can write this:
+makeExcerpt('quickstart/ts/app/app.component.ts', 'import', '')
.alert.is-important
:marked
Note that you can often achieve this same goal using [Angular modules](#angular-module) instead.
Note that you can often achieve this using [Angular modules](#angular-module) instead.
:marked
## Binding
@ -121,8 +114,8 @@ block includes
Almost always refers to [Data Binding](#data-binding) and the act of
binding an HTML object property to a data object property.
May refer to a [Dependency Injection](#dependency-injection) binding
between a "token" or "key" and a dependency [provider](#provider).
May refer to a [dependency injection](#dependency-injection) binding
between a "token", also referred to as a "key", and a dependency [provider](#provider).
This more rare usage should be clear in context.
:marked
@ -130,11 +123,10 @@ block includes
.l-sub-section
block bootstrap-defn-top
:marked
We launch an Angular application by "bootstrapping" it using the application root Angular module (`AppModule`).
The bootstraping identifies an application's top level "root" [Component](#component), which is the first
component that is loaded for the application. For more information see the [QuickStart](!{docsLatest}/quickstart.html).
You launch an Angular application by "bootstrapping" it using the application root Angular module (`AppModule`). Bootstrapping identifies an application's top level "root" [component](#component), which is the first component that is loaded for the application.
For more information, see the [Setup](!{docsLatest}/guide/setup.html) page.
:marked
One can bootstrap multiple apps in the same `index.html`, each with its own top level root.
You can bootstrap multiple apps in the same `index.html`, each with its own top level root.
.l-main-section#C
:marked
@ -142,31 +134,29 @@ block includes
.l-sub-section
:marked
The practice of writing compound words or phrases such that each word or abbreviation begins with a capital letter
_except the first letter which is a lowercase letter_.
_except the first letter, which is lowercase_.
Function, property, and method names are typically spelled in camelCase. Examples include: `square`, `firstName` and `getHeroes`.
Function, property, and method names are typically spelled in camelCase. Examples include: `square`, `firstName` and `getHeroes`. Notice that `square` is an example of how you write a single word in camelCase.
This form is also known as **lower camel case**, to distinguish it from **upper camel case** which we call [PascalCase](#pascalcase).
When we write "camelCase" in this documentation we always mean *lower camel case*.
This form is also known as **lower camel case**, to distinguish it from **upper camel case**, which is [PascalCase](#pascalcase).
When you see "camelCase" in this documentation it always means *lower camel case*.
:marked
## Component
.l-sub-section
:marked
An Angular class responsible for exposing data
to a [View](#view) and handling most of the view’s display
and user-interaction logic.
An Angular class responsible for exposing data to a [view](#view) and handling most of the view’s display and user-interaction logic.
The Component is one of the most important building blocks in the Angular system.
It is, in fact, an Angular [Directive](#directive) with a companion [Template](#template).
The *component* is one of the most important building blocks in the Angular system.
It is, in fact, an Angular [directive](#directive) with a companion [template](#template).
The developer applies the `!{_at}Component` !{_decoratorLink} to
You apply the `!{_at}Component` !{_decoratorLink} to
the component class, thereby attaching to the class the essential component metadata
that Angular needs to create a component instance and render it with its template
as a view.
Those familiar with "MVC" and "MVVM" patterns will recognize
the Component in the role of "Controller" or "View Model".
the component in the role of "controller" or "view model".
.l-main-section#D
:marked
@ -181,56 +171,48 @@ block includes
spelled in dash-case.
:marked
## Data Binding
## Data binding
.l-sub-section
:marked
Applications display data values to a user and respond to user
actions (clicks, touches, keystrokes).
We could push application data values into HTML, attach
event listeners, pull changed values from the screen, and
update application data values ... all by hand.
Or we could declare the relationship between an HTML widget
and an application data source ... and let a data binding
Instead of manually pushing application data values into HTML, attaching
event listeners, pulling changed values from the screen, and
updating application data values, you can use data binding by declaring the relationship between an HTML widget and data source and let the
framework handle the details.
Data Binding is that second approach. Angular has a rich
data binding framework with a variety of data binding
Angular has a rich data binding framework with a variety of data binding
operations and supporting declaration syntax.
The many forms of binding include:
* [Interpolation](!{docsLatest}/guide/template-syntax.html#interpolation)
* [Property Binding](!{docsLatest}/guide/template-syntax.html#property-binding)
* [Event Binding](!{docsLatest}/guide/template-syntax.html#event-binding)
* [Attribute Binding](!{docsLatest}/guide/template-syntax.html#attribute-binding)
* [Class Binding](!{docsLatest}/guide/template-syntax.html#class-binding)
* [Style Binding](!{docsLatest}/guide/template-syntax.html#style-binding)
* [Two-way data binding with ngModel](!{docsLatest}/guide/template-syntax.html#ng-model)
Read about the forms of binding in the [Template Syntax](!{docsLatest}/guide/template-syntax.html#data-binding) page:
* [Interpolation](!{docsLatest}/guide/template-syntax.html#interpolation).
* [Property binding](!{docsLatest}/guide/template-syntax.html#property-binding).
* [Event binding](!{docsLatest}/guide/template-syntax.html#event-binding).
* [Attribute binding](!{docsLatest}/guide/template-syntax.html#attribute-binding).
* [Class binding](!{docsLatest}/guide/template-syntax.html#class-binding).
* [Style binding](!{docsLatest}/guide/template-syntax.html#style-binding).
* [Two-way data binding with ngModel](!{docsLatest}/guide/template-syntax.html#ngModel).
Learn more about data binding in the
[Template Syntax](!{docsLatest}/guide/template-syntax.html#data-binding) chapter.
+ifDocsFor('ts|dart')
a#decorator
a#decoration
:marked
## Decorator | Decoration
## Decorator | decoration
.l-sub-section
block decorator-defn
:marked
A Decorator is a **function** that adds metadata to a class, its members (properties, methods) and function arguments.
A decorator is a **function** that adds metadata to a class, its members (properties, methods) and function arguments.
Decorators are a JavaScript language [feature](https://github.com/wycats/javascript-decorators), implemented in TypeScript and proposed for ES2016 (AKA ES7).
We apply a decorator by positioning it
immediately above or to the left of the thing it decorates.
To apply a decorator, position it immediately above or to the left of the thing it decorates.
Angular has its own set of decorators to help it interoperate with our application parts.
Angular has its own set of decorators to help it interoperate with your application parts.
Here is an example of a `@Component` decorator that identifies a
class as an Angular [Component](#component) and an `@Input` decorator applied to a property
of that component.
The elided object argument to the `@Component` decorator would contain the pertinent component metadata.
class as an Angular [component](#component) and an `@Input` decorator applied to the `name` property
of that component. The elided object argument to the `@Component` decorator would contain the pertinent component metadata.
```
@Component({...})
export class AppComponent {
@ -244,77 +226,75 @@ block includes
.alert.is-important
:marked
Always include the parentheses `()` when applying a decorator.
A decorator is a **function** that must be called when applied.
Always include parentheses `()` when applying a decorator.
:marked
## Dependency Injection
## Dependency injection
.l-sub-section
:marked
Dependency Injection is both a design pattern and a mechanism
Dependency injection is both a design pattern and a mechanism
for creating and delivering parts of an application to other
parts of an application that request them.
Angular developers prefer to build applications by defining many simple parts
that each do one thing well and then wire them together at runtime.
that each do one thing well and then wiring them together at runtime.
These parts often rely on other parts. An Angular [Component](#component)
part might rely on a service part to get data or perform a calculation. When a
part "A" relies on another part "B", we say that "A" depends on "B" and
These parts often rely on other parts. An Angular [component](#component)
part might rely on a service part to get data or perform a calculation. When
part "A" relies on another part "B", you say that "A" depends on "B" and
that "B" is a dependency of "A".
We can ask a "Dependency Injection System" to create "A"
You can ask a "dependency injection system" to create "A"
for us and handle all the dependencies.
If "A" needs "B" and "B" needs "C", the system resolves that chain of dependencies
and returns a fully prepared instance of "A".
Angular provides and relies upon its own sophisticated
[Dependency Injection](dependency-injection.html) system
[dependency injection](dependency-injection.html) system
to assemble and run applications by "injecting" application parts
into other application parts where and when needed.
At the core there is an [`Injector`](#injector) that returns dependency values on request.
At the core there is an [`injector`](#injector) that returns dependency values on request.
The expression `injector.get(token)` returns the value associated with the given token.
A token is an Angular type (`OpaqueToken`). We rarely deal with tokens directly; most
A token is an Angular type (`OpaqueToken`). You rarely deal with tokens directly; most
methods accept a class name (`Foo`) or a string ("foo") and Angular converts it
to a token. When we write `injector.get(Foo)`, the injector returns
to a token. When you write `injector.get(Foo)`, the injector returns
the value associated with the token for the `Foo` class, typically an instance of `Foo` itself.
Angular makes similar requests internally during many of its operations
as when it creates a [`Component`](#component) for display.
During many of its operations, Angular makes similar requests internally, such as when it creates a [`component`](#component) for display.
The `Injector` maintains an internal map of tokens to dependency values.
If the `Injector` can't find a value for a given token, it creates
a new value using a `Provider` for that token.
A [Provider](#provider) is a recipe for
A [provider](#provider) is a recipe for
creating new instances of a dependency value associated with a particular token.
An injector can only create a value for a given token if it has
a `Provider` for that token in its internal provider registry.
a `provider` for that token in its internal provider registry.
Registering providers is a critical preparatory step.
Angular registers some of its own providers with every injector.
We can register our own providers.
Learn more in the [Dependency Injection](!{docsLatest}/guide/dependency-injection.html) chapter.
Read more in the [Dependency Injection](!{docsLatest}/guide/dependency-injection.html) page.
:marked
## Directive
.l-sub-section
:marked
An Angular class responsible for creating, re-shaping, and interacting with HTML elements
An Angular class responsible for creating, reshaping, and interacting with HTML elements
in the browser DOM. Directives are Angular's most fundamental feature.
A Directive is almost always associated with an HTML element or attribute.
We often refer to such an element or attribute as the directive itself.
When Angular finds a directive in an HTML template,
it creates the matching directive class instance
and gives that instance control over that portion of the browser DOM.
and gives the instance control over that portion of the browser DOM.
Developers can invent custom HTML markup (e.g., `<my-directive>`) to
associate with their custom directives. They add this custom markup to HTML templates
as if they were writing native HTML. In this way, directives become extensions of
You can invent custom HTML markup (for example, `<my-directive>`) to
associate with your custom directives. You add this custom markup to HTML templates
as if you were writing native HTML. In this way, directives become extensions of
HTML itself.
Directives fall into one of three categories:
@ -324,12 +304,12 @@ block includes
They are the building blocks of an Angular application and the
developer can expect to write a lot of them.
1. [Attribute Directives](#attribute-directive) that can listen to and modify the behavior of
1. [Attribute directives](#attribute-directive) that can listen to and modify the behavior of
other HTML elements, attributes, properties, and components. They are usually represented
as HTML attributes, hence the name.
1. [Structural Directives](#structural-directive), a directive responsible for
shaping or re-shaping HTML layout, typically by adding, removing, or manipulating
1. [Structural directives](#structural-directive), a directive responsible for
shaping or reshaping HTML layout, typically by adding, removing, or manipulating
elements and their children.
.l-main-section#E
@ -342,9 +322,9 @@ block includes
The latest approved version of JavaScript is
[ECMAScript 2016](http://www.ecma-international.org/ecma-262/7.0/)
(AKA "ES2016" or "ES7") and many Angular developers will write their applications
(AKA "ES2016" or "ES7") and many Angular developers write their applications
either in this version of the language or a dialect that strives to be
compatible with it such as [TypeScript](#typesScript).
compatible with it, such as [TypeScript](#typescript).
Most modern browsers today only support the much older "ECMAScript 5" (AKA ES5) standard.
Applications written in ES2016, ES2015 or one of their dialects must be "[transpiled](#transpile)"
@ -356,17 +336,17 @@ block includes
## ES2015
.l-sub-section
:marked
Short hand for "[ECMAScript 2015](#ecmascript=2015)".
Short hand for [ECMAScript](#ecmascript) 2015.
:marked
## ES6
.l-sub-section
:marked
Short hand for "[ECMAScript 2015](#ecmascript=2015)".
Short hand for [ECMAScript](#ecmascript) 2015.
:marked
## ES5
.l-sub-section
:marked
Short hand for "ECMAScript 5", the version of JavaScript run by most modern browsers.
Short hand for [ECMAScript](#ecmascript) 5, the version of JavaScript run by most modern browsers.
See [ECMAScript](#ecmascript).
a#F
@ -386,41 +366,39 @@ a#H
.l-sub-section
:marked
A directive property that can be the ***target*** of a
[Property Binding](!{docsLatest}/guide/template-syntax.html#property-binding).
[property binding](!{docsLatest}/guide/template-syntax.html#property-binding) (explained in detail in the [Template Syntax](!{docsLatest}/guide/template-syntax.html) page).
Data values flow *into* this property from the data source identified
in the template expression to the right of the equal sign.
See the [Template Syntax](!{docsLatest}/guide/template-syntax.html#inputs-outputs) chapter.
See the [Input and output properties](!{docsLatest}/guide/template-syntax.html#inputs-outputs) section of the [Template Syntax](!{docsLatest}/guide/template-syntax.html) page.
:marked
## Interpolation
.l-sub-section
:marked
A form of [Property Data Binding](#data-binding) in which a
A form of [property data binding](#data-binding) in which a
[template expression](#template-expression) between double-curly braces
renders as text. That text may be concatenated with neighboring text
before it is assigned to an element property
or displayed between element tags as in this example.
or displayed between element tags, as in this example.
code-example(language="html" escape="html").
<label>My current hero is {{hero.name}}</label>
:marked
Learn more about interpolation in the
[Template Syntax](!{docsLatest}/guide/template-syntax.html#interpolation) chapter.
Read more about [interpolation](!{docsLatest}/guide/template-syntax.html#interpolation) in the
[Template Syntax](!{docsLatest}/guide/template-syntax.html) page.
.l-main-section#J
+ifDocsFor('ts')
a#jit
:marked
## Just-in-Time (JiT) Compilation
## Just-in-Time (JiT) compilation
.l-sub-section
:marked
With Angular _Just-in-time_ bootstrapping you compile your components and modules in the
browser
With Angular _just-in-time_ bootstrapping you compile your components<span if-docs="ts"> and modules</span> in the browser
and launch the application dynamically. This is a good choice during development.
Consider the [Ahead-of-time](#aot) mode for production apps.
Consider using the [ahead-of-time](#aot) mode for production apps.
.l-main-section#K
:marked
@ -431,29 +409,29 @@ a#H
.l-main-section#L
:marked
## Lifecycle Hooks
## Lifecycle hooks
.l-sub-section
:marked
[Directives](#directive) and [Components](#component) have a lifecycle
managed by Angular as it creates, updates and destroys them.
[Directives](#directive) and [components](#component) have a lifecycle
managed by Angular as it creates, updates, and destroys them.
Developers can tap into key moments in that lifecycle by implementing
one or more of the "Lifecycle Hook" interfaces.
You can tap into key moments in that lifecycle by implementing
one or more of the lifecycle hook interfaces.
Each interface has a single hook method whose name is the interface name prefixed with `ng`.
For example, the `OnInit` interface has a hook method names `ngOnInit`.
For example, the `OnInit` interface has a hook method named `ngOnInit`.
Angular calls these hook methods in the following order:
* `ngOnChanges` - called when an [input](#input)/[output](#output) binding values change
* `ngOnInit` - after the first `ngOnChanges`
* `ngDoCheck` - developer's custom change detection
* `ngAfterContentInit` - after component content initialized
* `ngAfterContentChecked` - after every check of component content
* `ngAfterViewInit` - after component's view(s) are initialized
* `ngAfterViewChecked` - after every check of a component's view(s)
* `ngOnChanges` - when an [input](#input)/[output](#output) binding value changes.
* `ngOnInit` - after the first `ngOnChanges`.
* `ngDoCheck` - developer's custom change detection.
* `ngAfterContentInit` - after component content initialized.
* `ngAfterContentChecked` - after every check of component content.
* `ngAfterViewInit` - after component's view(s) are initialized.
* `ngAfterViewChecked` - after every check of a component's view(s).
* `ngOnDestroy` - just before the directive is destroyed.
Learn more in the [Lifecycle Hooks](!{docsLatest}/guide/lifecycle-hooks.html) chapter.
Read more in the [Lifecycle Hooks](!{docsLatest}/guide/lifecycle-hooks.html) page.
.l-main-section#M
@ -465,14 +443,13 @@ a#H
:marked
In Angular, there are two types of modules:
- [Angular modules](#angular-module).
See the [Angular Module](!{docsLatest}/guide/ngmodule.html) chapter for details and examples.
- ES2015 modules as described in this section.
For details and examples, see the [Angular Modules](!{docsLatest}/guide/ngmodule.html) page.
- ES2015 modules, as described in this section.
:marked
Angular apps are modular.
In general, we assemble our application from many modules, both the ones we write ourselves
and the ones we acquire from others.
In general, you assemble your application from many modules, both the ones you write and the ones you acquire from others.
A typical module is a cohesive block of code dedicated to a single purpose.
@ -480,21 +457,19 @@ a#H
A module that needs that thing, **imports** it.
The structure of Angular modules and the import/export syntax
is based on the [ES2015](#es2015) module standard
described [here](http://www.2ality.com/2014/09/es6-modules-final.html).
is based on the [ES2015 module standard](http://www.2ality.com/2014/09/es6-modules-final.html).
An application that adheres to this standard requires a module loader to
load modules on request and resolve inter-module dependencies.
load modules on request, and resolve inter-module dependencies.
Angular does not ship with a module loader and does not have a preference
for any particular 3rd party library (although most samples use SystemJS).
Application developers may pick any module library that conforms to the standard
for any particular 3rd party library (although most examples use SystemJS).
You may pick any module library that conforms to the standard.
Modules are typically named after the file in which the exported thing is defined.
The Angular [DatePipe](https://github.com/angular/angular/blob/master/modules/@angular/common/src/pipes/date_pipe.ts)
class belongs to a feature module named `date_pipe` in the file `date_pipe.ts`.
Developers rarely access Angular feature modules directly.
We usually import them from one of the Angular [scoped packages](#scoped-package) such as `@angular/core`.
You rarely access Angular feature modules directly. You usually import them from one of the Angular [scoped packages](#scoped-package) such as `@angular/core`.
a#N
.l-main-section#O
@ -504,8 +479,8 @@ a#N
## Observable
.l-sub-section
:marked
We can think of an observable as an array whose items arrive asynchronously over time.
Observables help us manage asynchronous data, such as data coming from a backend service.
You can think of an observable as an array whose items arrive asynchronously over time.
Observables help you manage asynchronous data, such as data coming from a backend service.
Observables are used within Angular itself, including Angular's event system and its http client service.
To use observables, Angular uses a third-party library called Reactive Extensions (RxJS).
@ -515,12 +490,12 @@ a#N
## Output
.l-sub-section
:marked
A directive property that can be the ***target*** of an
[Event Binding](!{docsLatest}/guide/template-syntax.html#property-binding).
A directive property that can be the ***target*** of
[event binding](!{docsLatest}/guide/template-syntax.html#event-binding).
Events stream *out* of this property to the receiver identified
in the template expression to the right of the equal sign.
See the [Template Syntax](!{docsLatest}/guide/template-syntax.html#inputs-outputs) chapter.
See the [Input and output properties](!{docsLatest}/guide/template-syntax.html#inputs-outputs) section of the [Template Syntax](!{docsLatest}/guide/template-syntax.html) page.
.l-main-section#P
@ -528,20 +503,18 @@ a#N
## PascalCase
.l-sub-section
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The practice of writing compound words or phrases such that each word or abbreviation begins with a capital letter.
Class names are typically spelled in PascalCase. Examples include: `Person` and `HeroDetailComponent`.
The practice of writing individual words, compound words, or phrases such that each word or abbreviation begins with a capital letter. Class names are typically spelled in PascalCase. Examples include: `Person` and `HeroDetailComponent`.
This form is also known as **upper camel case**, to distinguish it from **lower camel case** which we simply call [camelCase](#camelcase).
In this documentation, "PascalCase" means *upper camel case* and "camelCase" means *lower camel case*.
This form is also known as **upper camel case** to distinguish it from **lower camel case**, which is simply called [camelCase](#camelcase). In this documentation, "PascalCase" means *upper camel case* and "camelCase" means *lower camel case*.
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## Pipe
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An Angular pipe is a function that transforms input values to output values for
display in a [view](#view). We use the `!{_at}Pipe` !{_decoratorLink}
to associate the pipe function with a name. We can then use that
name in our HTML to declaratively transform values on screen.
display in a [view](#view). Use the `!{_at}Pipe` !{_decoratorLink}
to associate the pipe function with a name. You then use that
name in your HTML to declaratively transform values on screen.
Here's an example that uses the built-in `currency` pipe to display
a numeric value in the local currency.
@ -549,24 +522,22 @@ a#N
code-example(language="html" escape="html").
<label>Price: </label>{{product.price | currency}}
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Learn more in the chapter on [pipes](!{docsLatest}/guide/pipes.html) .
Read more in the page on [pipes](!{docsLatest}/guide/pipes.html).
- var _ProviderUrl = docsLatest+'/api/'+(lang == 'dart' ? 'angular2.core' : 'core/index')+'/Provider-class.html'
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## Provider
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A [Provider](!{_ProviderUrl}) creates a new instance of a dependency for the
[Dependency Injection](#dependency-injection) system.
It relates a lookup token to code &mdash; sometimes called a "recipe" &mdash;
that can create a dependency value.
A _provider_ creates a new instance of a dependency for the
[dependency injection](#dependency-injection) system.
It relates a lookup token to code&mdash;sometimes called a "recipe"&mdash;that can create a dependency value.
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## Reactive Forms
## Reactive forms
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A technique for building Angular forms through code in a component.
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- The template input elements do *not* use `ngModel`.
- The associated Angular directives are all prefixed with `Form` such as `FormGroup`, `FormControl`, and `FormControlName`.
Reactive forms are powerful, flexible, and great for more complex data entry form scenarios, such as dynamic generation
of form controls.
Reactive forms are powerful, flexible, and great for more complex data entry form scenarios such as dynamic generation of form controls.
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## Router
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Most applications consist of many screens or [views](#view).
The user navigates among them by clicking links and buttons
and taking other similar actions that cause the application to
The user navigates among them by clicking links and buttons,
and performing other similar actions that cause the application to
replace one view with another.
The Angular [Component Router](!{docsLatest}/guide/router.html) is a richly featured mechanism for configuring
and managing the entire view navigation process including the creation and destruction
The Angular [component router](!{docsLatest}/guide/router.html) is a richly featured mechanism for configuring and managing the entire view navigation process including the creation and destruction
of views.
+ifDocsFor('ts|js')
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In most cases, components becomes attached to a [router](#router) by means
In most cases, components become attached to a [router](#router) by means
of a `RouterConfig` that defines routes to views.
A [routing component's](#routing-component) template has a `RouterOutlet` element
@ -604,31 +573,30 @@ a#Q
Other views in the application likely have anchor tags or buttons with `RouterLink`
directives that users can click to navigate.
See the [Component Router](!{docsLatest}/guide/router.html) chapter to learn more.
For more information, see the [Routing & Navigation](!{docsLatest}/guide/router.html) page.
+ifDocsFor('ts|js')
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## RouterModule
## Router module
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A separate [Angular module](#angular-module) that provides the necessary service providers and directives for navigating through application views.
See the [Component Router](!{docsLatest}/guide/router.html) chapter to learn more.
For more information, see the [Routing & Navigation](!{docsLatest}/guide/router.html) page.
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## Routing Component
## Routing component
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An Angular [Component](#component) with a RouterOutlet that displays views based on router navigations.
An Angular [component](#component) with a `RouterOutlet` that displays views based on router navigations.
See the [Component Router](!{docsLatest}/guide/router.html) chapter to learn more.
For more information, see the [Routing & Navigation](!{docsLatest}/guide/router.html) page.
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## Scoped Package
## Scoped package
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Angular modules are delivered within *scoped packages* such as `@angular/core`, `@angular/common`, `@angular/platform-browser-dynamic`,
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A [*scoped package*](https://docs.npmjs.com/misc/scope) is a way to group related *npm* packages.
We import a scoped package the same way we'd import a *normal* package.
You import a scoped package the same way that you'd import a *normal* package.
The only difference, from a consumer perspective,
is that the package name begins with the Angular *scope name*, `@angular`.
is that the *scoped package* name begins with the Angular *scope name*, `@angular`.
+makeExcerpt('architecture/ts/app/app.component.ts', 'import', '')
@ -649,38 +617,34 @@ a#snake-case
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block snake-case-defn
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The practice of writing compound words or phrases such that each word is separated by an
underscore (`_`). This form is also known as **underscore case**.
The practice of writing compound words or phrases such that an
underscore (`_`) separates one word from the next. This form is also known as **underscore case**.
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## Service
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Components are great and all, but what do we do with data or logic that are not associated
with a specific view or that we want to share across components? We build services!
For data or logic that is not associated
with a specific view or that you want to share across components, build services.
Applications often require services such as a hero data service or a logging service.
Our components depend on these services to do the heavy lifting.
A service is a class with a focused purpose.
We often create a service to implement features that are
independent from any specific view,
provide share data or logic across components, or encapsulate external interactions.
provide shared data or logic across components, or encapsulate external interactions.
See the [Services](!{docsLatest}/tutorial/toh-pt4.html) chapter of the tutorial to learn more.
For more information, see the [Services](!{docsLatest}/tutorial/toh-pt4.html) page of the [Tour of Heroes](!{docsLatest}/tutorial/) tutorial.
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## Structural Directive
## Structural directive
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A category of [Directive](#directive) that can
shape or re-shape HTML layout, typically by adding, removing, or manipulating
elements and their children.
A category of [directive](#directive) that can
shape or reshape HTML layout, typically by adding, removing, or manipulating
elements and their children; for example, the `ngIf` "conditional element" directive and the `ngFor` "repeater" directive.
The `ngIf` "conditional element" directive and the `ngFor` "repeater" directive are
good examples in this category.
See the [Structural Directives](!{docsLatest}/guide/structural-directives.html) chapter to learn more.
Read more in the [Structural Directives](!{docsLatest}/guide/structural-directives.html) page.
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A template is a chunk of HTML that Angular uses to render a [view](#view) with
the support and continuing guidance of an Angular [Directive](#directive),
most notably a [Component](#component).
the support and continuing guidance of an Angular [directive](#directive),
most notably a [component](#component).
We write templates in a special [Template Syntax](!{docsLatest}/guide/template-syntax.html).
+ifDocsFor('ts|js')
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## Template-Driven Forms
## Template-driven forms
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A technique for building Angular forms using HTML forms and input elements in the view.
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When building template-driven forms:
- The "source of truth" is the template. The validation is defined using attributes on the individual input elements.
- [Two-way binding](#data-binding) with `ngModel` keeps the component model in synchronization with the user's entry into the input elements.
- Behind the scenes, Angular creates a new control for each input element that has a `name` attribute and
two-way binding set up.
- Behind the scenes, Angular creates a new control for each input element, provided you have set up a `name` attribute and two-way binding for each input.
- The associated Angular directives are all prefixed with `ng` such as `ngForm`, `ngModel`, and `ngModelGroup`.
Template-driven forms are convenient, quick, and simple and are a good choice for many basic data entry form scenarios.
Template-driven forms are convenient, quick, and simple. They are a good choice for many basic data entry form scenarios.
Learn how to build template-driven forms
in the [Forms](!{docsLatest}/guide/forms.html) chapter.
Read about how to build template-driven forms
in the [Forms](!{docsLatest}/guide/forms.html) page.
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## Template Expression
## Template expression
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An expression is a !{_Lang}-like syntax that Angular evaluates within
a [data binding](#data-binding). Learn how to write template expressions
in the [Template Syntax](!{docsLatest}/guide/template-syntax.html#template-expressions) chapter.
a [data binding](#data-binding).
Read about how to write template expressions
in the [Template Syntax](!{docsLatest}/guide/template-syntax.html#template-expressions) page.
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## Transpile
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The process of transforming code written in one form of JavaScript
(e.g., TypeScript) into another form of JavaScript (e.g., [ES5](#es5)).
(for example, TypeScript) into another form of JavaScript (for example, [ES5](#es5)).
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## TypeScript
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A version of JavaScript that supports most [ECMAScript 2015](#ecmascript=2015)
language features and many features that may arrive in future versions
of JavaScript such as [Decorators](#decorator).
A version of JavaScript that supports most [ECMAScript 2015](#es2015)
language features such as [decorators](#decorator).
TypeScript is also noteable for its optional typing system which gives
us compile-time type-checking and strong tooling support (e.g. "intellisense",
TypeScript is also noteable for its optional typing system, which gives
us compile-time type checking and strong tooling support (for example, "intellisense",
code completion, refactoring, and intelligent search). Many code editors
and IDEs support TypeScript either natively or with plugins.
TypeScript is the preferred language for Angular development although
we are welcome to write in other JavaScript dialects such as [ES5](#es5).
you can use other JavaScript dialects such as [ES5](#es5).
Learn more about TypeScript on its [website](http://www.typescriptlang.org/).
Read more about TypeScript at [typescript.org](http://www.typescriptlang.org/).
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A view is a portion of the screen that displays information and responds
to user actions such as clicks, mouse moves, and keystrokes.
Angular renders a view under the control of one or more [Directives](#directive),
especially [Component](#component) directives and their companion [Templates](#template).
The Component plays such a prominent role that we often
find it convenient to refer to a component as a view.
Angular renders a view under the control of one or more [directives](#directive),
especially [component](#component) directives and their companion [templates](#template).
The component plays such a prominent role that it's often
convenient to refer to a component as a view.
Views often contain other views and any view might be loaded and unloaded
dynamically as the user navigates through the application, typically
@ -779,16 +742,16 @@ a#Y
a JavaScript application's asynchronous activity.
The browser DOM and JavaScript have a limited number
of asynchronous activities, activities such as DOM events (e.g., clicks),
of asynchronous activities, activities such as DOM events (for example, clicks),
[promises](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise), and
[XHR](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest)
calls to remote servers.
Zones intercept all of these activities and give a "zone client" the opportunity
to take action before and after the async activity completes.
to take action before and after the async activity finishes.
Angular runs our application in a zone where it can respond to
asynchronous events by checking for data changes and updating
Angular runs your application in a zone where it can respond to
asynchronous events by checking for data changes, and updating
the information it displays via [data bindings](#data-binding).
Learn more about zones in this

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## Ahead-of-time (AoT) compilation
## Ahead-of-Time (AoT) compilation
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You can compile Angular applications at build-time.
By compiling your application using the compiler-cli, `ngc`, you can bootstrap directly
to a module factory, meaning you don't need to include the Angular compiler in your JavaScript bundle.
By compiling your application<span if-docs="ts"> using the compiler-cli, `ngc`</span>, you can bootstrap directly
to a<span if-docs="ts"> module</span> factory, meaning you don't need to include the Angular compiler in your JavaScript bundle.
Ahead-of-time compiled applications also benefit from decreased load time and increased performance.
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## Angular module
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block bootstrap-defn-top
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You launch an Angular application by "bootstrapping" it using the application root Angular module (`AppModule`). Bootstrapping identifies an application's top level "root" [component](#component), which is the first component that is loaded for the application.
For more information, see the [Setup](!{docsLatest}/guide/setup.html).
For more information, see the [Setup](!{docsLatest}/guide/setup.html) page.
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You can bootstrap multiple apps in the same `index.html`, each with its own top level root.
@ -391,13 +391,12 @@ a#H
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## Just-in-time (JiT) compilation
## Just-in-Time (JiT) compilation
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With Angular _just-in-time_ bootstrapping you compile your components and modules in the browser
With Angular _just-in-time_ bootstrapping you compile your components<span if-docs="ts"> and modules</span> in the browser
and launch the application dynamically. This is a good choice during development.
Consider using the [ahead-of-time](#aot) mode for production apps.
@ -588,9 +587,8 @@ a#Q
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## Routing component
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block routing-component-defn
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An Angular [component](#component) with a RouterOutlet that displays views based on router navigations.
An Angular [component](#component) with a `RouterOutlet` that displays views based on router navigations.
For more information, see the [Routing & Navigation](!{docsLatest}/guide/router.html) page.
@ -698,7 +696,7 @@ a#snake-case
## TypeScript
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:marked
A version of JavaScript that supports most [ECMAScript 2015](#ecmascript=2015)
A version of JavaScript that supports most [ECMAScript 2015](#es2015)
language features such as [decorators](#decorator).
TypeScript is also noteable for its optional typing system, which gives