angularjsHow do AngularJS and Angular 2 compare in terms of features and performance?

AngularJS and Angular 2 are similar in many ways, but there are also some key differences.

In terms of features, AngularJS is a JavaScript-based open-source front-end web application framework, while Angular 2 is a TypeScript-based open-source web application framework. AngularJS requires the use of controllers and $scope to manage the data for views, whereas Angular 2 uses components and directives. AngularJS uses the traditional Model-View-Controller (MVC) architecture, while Angular 2 uses the Model-View-ViewModel (MVVM) architecture.

In terms of performance, AngularJS has a higher initial loading time compared to Angular 2 due to its complex DOM manipulation. Angular 2 is faster due to its improved change detection and improved rendering.

For example, the following code block shows the difference between the two frameworks in terms of performance:

// AngularJS
$scope.data = {
  name: 'John',
  age: 30
};

// Angular 2
@Component({
  selector: 'app-root',
  template: `
    <div>
      {{data.name}} is {{data.age}} years old
    </div>
  `
})
export class AppComponent {
  data = {
    name: 'John',
    age: 30
  };
}

This code block does not produce any output.

In summary, AngularJS and Angular 2 are similar in terms of features but differ in terms of performance. AngularJS has a higher initial loading time but Angular 2 is faster due to its improved change detection and improved rendering.

Helpful links

• AngularJS Documentation
• Angular 2 Documentation

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