AngularJS can be embedded into a web page seamlessly with the <script> tag. The JavaScript framework further enables developers to simplify web application development by extending HTML attributes with a number of ng-directives – ng-app, ng-model and ng-bind. The developers can even use expressions to bind the AngularJS data to a web page. Angular further helps developers to build client-side applications by writing clean and reusable JavaScript code based on model-view-controller (MVC) programming paradigm. So Angular is used extensively for building ambitious and scalable web applications.

Each new version of Angular further comes with several new features to accelerate client-side web application development. Angular 1 was written in JavaScript, whereas Angular 2 was written in TypeScript. The version 2 of the popular JavaScript framework further meets ECMAScript 2015 specifications. Hence, web developers can upgrade their web applications from Angular 1 to 2 to improve their performance and user experience at a time. At the same time, they can accelerate custom web application development by migrating from Angular 1 to 2 and taking advantage of a number of new features provided by AngularJS 2.

Migrating from Angular 1 to 2: Why Should Web Developers Do It?

Component Based Architecture

Angular 1 enables developers to keep a web application’s user interface and business logic layers separated by supporting MVC programming paradigm. But Angular 2 is modular and it is a component-based framework. The modular pattern of AngularJS 2 makes it easier for developers to simplify development and maintenance of complex web applications by adding or removing specific modules.

Written in TypeScript

As noted earlier, AngularJS 2 is written in TypeScript, which is developed by Microsoft as an extension of the standard ECMAScript 6 syntax. It makes websites accessible across varying browsers by compiling into clean and simple JavaScript code. TypeScript further adds a number of new classes, modules and types to JavaScript, while meeting ECMAScript specifications. TypeScript enhances the performance of Angular 2 significantly.

Compatible with Modern Browsers

In addition to meeting ECMAScript 6 specifications, Angular 2 further targets modern browsers. Hence, it becomes easier for developers to create web applications that run smoothly on browsers that upgrade to latest versions automatically. The programmers do not need to write additional code to make the website run on modern web browsers. Also, they can write web application without focusing on specific browsers.

Focuses on Mobile App Development

Like Angular 1, Angular 2 also helps developers to create responsive websites and web applications. But Angular 2, unlike Angular 1, comes with built-in features to accelerate mobile app development. It even has the capability to render code differently for web browsers and mobile browsers. Hence, it becomes easier for developers to address common mobile app development challenges like performance and loading time.

Improves Application Performance

Angular 2 comes with several new features to make web applications perform better. It improves a website’s loading time and response rate significantly by supporting asynchronous templating and dynamic loading. It further accelerates module loading by providing a simplified module loader. The developers even have option to load ECMAScript 6 modules by using System.js as a universal loader. They even improve the web application’s performance by compiling the code offline and detecting changes quickly.

Cross-Platform Application Development

AngularJS 2 supports both modern browsers and popular mobile platforms. It supports the latest version of several widely used web browsers – Internet Explorer, Edge, Firefox, Chrome and Safari. At the same time, the framework also supports popular mobile operating systems like iOS and Android. Hence, an application developed with Angular 2 delivers optimal user experience across desktop computers and mobile devices.

Improved Data Binding

Angular 1 facilitates connecting business logic and views by supporting two-way data binding. It further keeps the model and view synchronized. Angular 2 allows developers to bind data in a number of ways. For instance, a developer can use interpolation to bind data in a manner similar to expressions. Likewise, he can perform one-way data binding using HTML DOM element property and two-way data binding using the ngModel directive.

Improved Dependency Injection Model

AngularJS 2 accelerates component or object based development by providing an improved and redesigned dependency injection model. The improved dependency injection model consists of three key components – injector, binding and dependencies. The APIs contained by injector makes dependency injection available and facilitates injection of dependencies. On the other hand, binding assigns names to individual dependencies. Once the object dependencies are generated they can be injected into the project.

Improved Routing Solution

Angular 2 comes with a routing solution which is the extended and revamped version of the router used by Angular 1. The updated routing solution comes with useful features like location service, navigational model, URL resolver, query string support, 404 route handling, and history manipulator. At the same time, the redesigned router allows developers to convert individual components of a web application into smaller applications using child routers. Likewise, the developers can manipulate the navigation lifecycle using callbacks like activate, deactivate, canActivate and canDeactivate.

Three New Directives

Angular 2 supports three new directives – component, decorator and template. The developers can use component directives to create reusable components by encapsulating HTML, JavaScript and CSS. Likewise, they can use decorator directives to decorate various elements, and use template directives to convert HTML into reusable templates. These directives help programmers to create more appealing web frontends without writing additional code.

On the whole, JavaScript web developers can easily improve a web application’s performance and user experience by migrating from Angular 1 to 2. The migration will further help the developers to keep the web application relevant by adopting ECMAScript 2015 specifications. A developer can further upgrade from Angular 1 to 2 in a number of ways according to precise project requirements. For instance, he can use ng-forward as the default solution to write Angular 2 style code in Angular 1. Otherwise, he can use ngUpgrade to rewrite the existing Angular 1 code in Angular 2.