Angular 1 Vs Angular 2

Angular team has released the angular 2, which has drastically change the way programmers interact and work with Angular framework in the past. In this post I will tell you the common changes made by the team in the current release. The primary goal of latest Angular 2 is to create an easier and more powerful web framework. Angular 2 is initially made with TypeScript, but this will be compatible with all latest JavaScript standards like ES5 and ES6 and Dart-lang.

New Component-Based Architecture

Angular 2 is based on component based architecture. Old Controllers and $scope systems is replaced with components and directives. Now controllers and directives are most important part of AngularJS based applications. Components work with selectors. A component has a selector and associated html tag to represent it.

Differences of Representation in Angular 1 and Angular 2

Angular 1.x:

angular.module(‘myApp’,[])
.controller(‘TestCtrl”, function() {
});

Angular 2.0:

import {Component, View} from 'angular2/angular2';
@Component({

selector: 'my-view'

});

At bootstrap we have to declare components before we start working with them. These components have to be imported on the page where these are used.

Input with the Event Syntax

Angular 2 makes events processing more simplified. Now applications can respond to input as an event too. You can deal with input like an event. The event syntax is simple as now you can denote events within parenthesis.

Differences of User Input handling syntax in Angular 1 and Angular 2

Angular 1.x:

<input ng-model=”particular.item” type=”text”>
<button ng-click=” particular.submit(item)” type=”submit”>

Angular 2.0:

<input #item type=”text”>
<button (click)=”submit(item)” type=”submit”>

Better Performance

Angular 2 is both faster and more memory efficient than Angular 1 this is done with the help of immutable data structures. Another reason for improved performance is introduction of uni-directional data flow. There is no direct way to implement two way data flow in angular 2 . This concept is in fact implemented in an entirely different way in Angular 2. You can use export syntax to do the same.

Data flow in Angular 2

@View({
templateUrl: './components/example/example.html'
})

export class Example {}

No $scope in Angular 2

Although $scope variable was an important part of angular 1 but it is deprecated in angular 2.

But the main thing to consideration is even ‘$scope’ is deprecated it is in fact is replaced by “controller”. In angular 2 properties are bound to components itself to work in applications.

Angular 2 is more transparent due to Zones

Angular 2 uses the zones mechanism. This ensures that old digest cycle is not necessary in the new environment. Angular 2 digest, if triggered by a component that is inside a zone:

Directives

With a clean @Directive annotation you can declare a directive in application. Directives can be used in components.

Improved Dependency Injection

Angular 2 has a better and improved dependency injection system. There are much more opportunities for components based applications.

There are certain benefits other benefits of AngularJS. Element references can also be available to other parts of the template. Angular team has taken a nice step to launch angular 2.

Shibaji Debnath