AngularJS VS Angular 2

AngularJS

Angular JS is an open source JavaScript framework that is used to build web applications. It can be freely used, changed and shared by anyone.

Angular Js is developed by Google.

It is an excellent framework for building single phase applications and line of business applications.

HTML language is used as a template in this scripting language. Here data is bound with expressions and helps to create more expressive and extraordinary environment that can quickly develop the applications.

It was released on 20th of October 2010.

Features of Angular JS

• A JavaScript MVW Framework
• Extends HTML support by adding tags, attributes, and expressions
• Allows easy event Handling
• Supports for Data Binding
• Built-In Template Engine and Routing
• Form Validations and Animations
• Dependencies Injection

Angular 2

After, releasing Angular JS, Angular team released Angular 2 which is complete rewrite of its original AngularJS. Angular 2 version is built around the concept of the component. It was rewritten from scratch by the Angular team using Typescript. It offers better performance to web developers. There are many new features along with other improvements and tweaks. It was released in September 2016.

Some Important Features of Angular 2 are:

• Modern, faster, and highly scalable framework
• Equally useful framework for web, mobile, and desktop apps
• Web components based architecture
• Supports Hierarchical Dependency Injection

1. Code

• The code of Angular JS framework can be written with the help of Dart. ES6, and ES5.
• The code of Angular 2 framework can be written by using Typescript, ES6, and ES5.

2. Architecture

• The structural concept of AngularJS is the model-view-controller (MVC) design basis, which proffers the central authority to express the very behavior of the application and further help them to manage the data, logic, and rules. With controller takes input, and converts into commands and further shares the commands to model and view.
• With the advanced version of Angular 2, the controllers along with the $scope got changed with components and further with directives, transforming the components into directives which hold the template. Now they can manage the app view and page logic. Angular 2 has 2 directives largely; structural directives to change DOM layout by removing or replacing elements, which further transform the DOM elements and their specific behavior and appearance.

3.Expression Syntax

• To bind an image/property or an event with AngularJS, you have to remember the right ng directive.
• Angular focuses on “( )” for event binding and “[ ]” for property binding.

4.Performance

If the performance of Angular JS and Angular 2 will be compared then you will find that Angular 2 is 5 times faster than the AngularJS.

5.Mobile Support

Angular JS does not support mobile devices, while Angular 2 does support all mobile devices.

6. Routing

• AngularJS utilizes the $routeprovider. when() has to be configured routing
• Angular utilizes @RouteConfig{(…)}.

7. Dependency injection

Angular implements unidirectional tree-based change detection and uses Hierarchical Dependency Injection system. This significantly boosts performance for the framework.

8. Speed

• By providing features like 2-way binding, AngularJS reduced the development effort and time. However, by creating more processing on the client side, page load was taking considerable time.
• Angular2 provides a better structure to more easily create and maintain big applications and a better change detection mechanism.

Now let’s see pros and cons of AngularJS and Angular 2.

Angular JS

Advantages

• It provides the capability to create Single Page Application in a very clean and maintainable way
• It provides data binding capability to HTML. Thus, it gives user a rich and responsive experience.
• AngularJS code is unit testable.
• AngularJS uses dependency injection and make use of separation of concerns.
• AngularJS provides reusable components.
• With AngularJS, the developers can achieve more functionality with short code.
• In AngularJS, views are pure html pages, and controllers written in JavaScript do the business processing.
• AngularJS apps can run on every significant program and advanced cells including iOS and Android-based phones and tablets.

Disadvantages

• Being JavaScript only framework, application written in AngularJS are not safe. Server side authentication and authorization is must to keep an application secure.
• If the user of your application disables JavaScript, then nothing would be visible, except the basic page.
• It is big and complicated due to the multiple ways of doing the same thing.
• Implementations scale poorly.
• UI gets cracked up with the rush of more than 200+ app at one time.

Angular 2

Advantages

• Browser Compatibilty: It supports IE 9, 10, 11, Firefox, Chrome, Safari, Android 4.1 & Microsoft Edge.
• Cross platform: Developer can developer applications using Angular JS 2.O & can run on desktop, mobile, Android, iOS, etc.
• Speed: It loads through server-side pre-rendering, offline compile for fast startup, and ultrafast change detection and view caching for smooth virtual scrolling and snappy view transitions.
• Development: Development by using language is up to the user/developer. It provide full support for CS5, TypeScript, Dart, ES6, other languages that compile to JavaScript.
• Dependency Injection & Animation is also possible using CSS & web animation.
• It provides the simplest routing.

Disadvantages

• Complex being compared to AngularJS when it comes to set up.
• Not an ideal choice if your aim is to create simple web apps.