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What is Angular JS?
AngularJS is open source, completely free, and used by thousands of developers around the world. It is licensed under the Apache License version 2.0.
Data-binding − It is the automatic synchronization of data between model and view components.
Scope − These are objects that refer to the model. They act as a glue between controller and view.
Services − AngularJS come with several built-in services for example $https: to make an XMLHttpRequests. These are singleton objects which are instantiated only once in app.
Filters − These select a subset of items from an array and returns a new array.
Directives − Directives are markers on DOM elements (such as elements, attributes, css, and more). These can be used to create custom HTML tags that serve as new, custom widgets. AngularJS has built-in directives (ngBind, ngModel.)
Templates − These are the rendered view with information from the controller and model. These can be a single file (like index.html) or multiple views in one page using "partials".
Routing − It is concept of switching views.
Model View Whatever − MVC is a design pattern for dividing an application into different parts (called Model, View and Controller), each with distinct responsibilities. AngularJS does not implement MVC in the traditional sense, but rather something closer to MVVM (Model-View-ViewModel). The Angular JS team refers it humorously as Model View Whatever.
Deep Linking − Deep linking allows you to encode the state of application in the URL so that it can be bookmarked. The application can then be restored from the URL to the same state.
Dependency Injection − AngularJS has a built-in dependency injection subsystem that helps the developer by making the application easier to develop, understand, and test.
2. Why AngularJS is used?
Time-saving: Projects that previously used to take many months with other frameworks can now be completed faster with AngularJS.
The app is easy to learn and get started: Getting up and running with AngularJS is perhaps the simplest thing a developer can imagine.
Data Binding in AngularJS is very easy:
A declarative expression of UI: AngularJS is fully structured, understanding and manipulating the components is very easy.
AngularJS should be used for development
Declarative User Interface
Reason for using Angular JS
A declarative user interface.
Data models are POJO
Behavior with directives
Flexibility with filters
Write less code
DOM manipulations where they belong
Service providers where they belong
Context aware communication
Unit testing ready
Backed By Google
Save on time
The SPA Help
Edge with Modules
Ease with Parallel Development
Full UI Support
Contextual PubSub System
Super User Experience
3. Some use case of angular JS
4. Tools or software used for development
Testing and debugging are important parts of the development process especially in an environment like Angular.
Jasmine: Jasmine is used for behavior-driven development (BDD), but you can use it for test-driven development (TDD) with a bit customization.
MochaJS: When compared to Jasmine, MochaJS is more flexible but Jasmine comes as an all-in-one package.
Protractor: Protractor is probably the most powerful automated end to end (e2e) Angular testing tool.
Angular Batarang: Batarang is a Chrome extension for debugging Angular applications.
ng-inspector: ng-inspector is a browser extension supported on Chrome and Safari