Angular JS also was known as “Angular.js” or “AngularJS 1.X” marked its birth in the year 2010, to ease out the building of complex and data-heavy web apps through JavaScript. At the time of launch Angular JS could boast of having three jewels glued to its glory:

  1. Inimitable fast code production
  2. Effortless testable piece of application
  3. Backstage support of Google

But technology is another term for continuous change or innovation. Thus came the good news of Angular JS 2, which is very much distant in nature to its elder JS 1. Let’s study the differences in detail with examples to ensure ease of understanding on part of every reader.

Angular JS 2 has better mobile acclimatization and excels in its performance.

When Angular JS 1 was being conceived, mobile support friendly mechanism was not taken into consideration, however, Angular 2 was thoroughly mobile supported. The use of Hierarchical Dependency Injection system and unidirectional tree based change detection in Angular 2 is a considerable performance backer.

Angular JS

Angular 2 offers wide range of language options

Angular 2 has ES5, ES6, and TypeScript or Dart languages to select from as opposed to Angular 1 which has limited options under its umbrella, namely ES5, ES6, and Dart.

Implementation of web standards in Angular 2

Angular 2 provides exceptional quality performance as compared to Angular 1, because of the implementation of web standards (components).

Angular 2

Ease of setup

In the easy setup of Angular JS, one has to only add reference library and it is good to go. Whereas Angular 2 is dependent on other libraries and hence has complex steps to follow, before the final green signal.

Gone are the days of Angular 1.x controllers and $scope

In Angular 2, controllers are replaced with “Components”. Angular 2 uses zone.js to detect the changes.

Angular 1.x controllers

Angular 2.x controllers

Way to define local variables

In Angular JS 2 local variables are defined using hash (#).

Change in structural directives syntax

In Angular 2 ng-repeat is replaced with *ngFor. In AngularJS 2 version “2.0.0-beta.17 instead of “#” use “let”.

AngularJS Structural Directives

Use of camelCase syntax for built-in directives

Angular 2 uses camelCase syntax for built-in directives. For example, ng-model is now ngModel.

HTML DOM element properties and events

Angular 2 directly uses HTML DOM element properties and events, because of which several Angular 1 built in directives has lost their application. For example, ng-href, ng-src, ng-show and ng-hide of Angular 1, were replaced with href, src and hidden of Angular 2.

Data binding directive replaced

In Angular 2, ng-bind used for one-way data binding in Angular 1 has been replaced with [property].

Angular 1.x, one-way data binding

<input ng-bind=””></input>

Angular 2, one-way data binding

<button (click)=”doSomething()”>

Two-way data binding

In Angular 2, ng-model used for two way data binding in Angular 1 has been replaced with [(ngModel)].

Angular 1, two-way data binding,

<input ng-model=””></input>

Angular 2, two-way data binding,

<input [(ngModel)]=””></input>

Bootstrapping Angular Application

In Angular 1, there are two ways to bootstrap:  ng-app attribute and other via code.

Bootstrapping Angular Application

In Angular 2, it is only ng-app

In Angular 2, it is only ng-app

Ways of Dependency Injection

In Angular 2, dependency injection is used through constructors

Dependency Injection

Changed way of routing

In Angular 1 $routeProvider.when() is used for routing. In Angular 2 @RouteConfig{(…}) is used for routing.  ng-view in Angular 1 is replaced as <router-outlet> in Angular 2.

IN Angular 1.x

IN Angular 2.x

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