Understanding the benefits of AngularJS to build modern web apps
This blog post is written to give you a clear picture of benefits that you can take by using AngularJS in your projects. Firstly, I’ll tell you what actually AngularJS is, and then give you some solid reasons that will definitely compel you to think “why it’s crucial to adopt AngularJS today”.
What is AngularJS?
Why to Choose AngularJS for Your Next Web App?
Below are some good reasons to choose AngularJS to be an expert in web app development:
Directive Defines Behavior:
AngularJS directives allow developers to invent new application-specific HTML elements that are completely reusable. They are used to perform all manipulations in DOM attributes, hide complex DOM structure and define the behavior of specific presentation components. Directives come in four flavors:
v HTML element (<angular></angular>)
v Custom attribute (<div data-angular></div>)
v CSS class (<div class=”angular”></div>)
v Comment (<!–directive:angular–>)
Directives play a vital role in incorporating Angular’s functionality into a page. With directives, you can extend your HTML to the great extent by creating custom and reusable HTML components. Prefaced with ng-, a directive is placed in HTML attributes and works as a standalone element separated from your MVC app. Some of the notable and most used built-in Angular directives are ng-app, ng-bind, ng-model, ng-repeat, ng-controller and ng-class.
Handles Dependencies Excellently:
AngularJS features a pre-built injector subsystem that is responsible for creating elements, dealing with their dependencies and delivering them to other elements as required. By taking advantage of dependency injection (DI), Angular carries traditional services from server-side to web apps on the client-side. As a result, much of the load on the server side is decreased, which makes your web application much lighter and faster.
AngularJS can easily handle dependencies since it allows you to divide your web app into logical modules that are dependent on each other and can be initialized separately. Means, you need to work with only the module that you’re interested in. In this way, Angular makes everything from application development to testing a breeze for developers. As DI is pervasive throughout Angular, you can also add a particular dependency as a parameter to AngularJS service function.
Expresses UI Declaratively:
AngularJS takes a declarative approach to make app development and testing easier by adapting and extending traditional HTML. It allows you to declare your app’s user interface and put markup directly into HTML, so the imperative logic can be kept separate from the presentation logic. Rather than spending time on the flow of the program, Angular lets you declare what you really want, and takes care of how components should get hold of their dependencies.
Keeps Code Short:
Two-way data binding in AngularJS reduces server refresh cycles by binding the view to the model permanently. By establishing an automated synchronization of data between the view and model components, it saves you the trouble of writing a huge amount of useless code. Generally, in a typical web app, nearly 80 percent of code is reserved for various DOM-related responsibilities. Angular’s two-way data binding technique makes this unnecessary code disappear, forcing you to focus only on important aspects of your web application.
As the classical template system binds data in a single direction, developers are required to manually perform DOM manipulation which is a very arduous and complicated process. In contrast, AngularJS saves developers from manually placing data into the view by giving them advantage of automatic data synchronization. Consequently, developers have to write less code which in itself is a great deal.
Filters Provide Flexibility:
Just like directives, which are separate from the app, Filters are standalone functions that concern with transformation of data. They filter the data before it reaches the view and are in charge of activities like implementing pagination, formatting a number with decimal points, reversing a text string, and filtering an array based on conditions etc.
Built to be Testable:
By taking advantage of dependency injection and two-way data binding, Angular makes your code easy to reuse, effortless to maintain, simple to test and free from boilerplate. For end-to-end testing, Angular uses a built-in end to end test runner, called “Protractor”. Also, it’s completely ready for Unit testing to let you test individual units of your code. Moreover, AngularJS developers have built a Google Chrome extension, known as “AngularJS Batarang”, to help developers identify performance bottlenecks and let them debug their applications inside the browser.