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What is Angular?

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AngularJS is a structural framework for dynamic web apps. It lets you use HTML as your template language and lets you extend HTML’s syntax to express your application’s components clearly and succinctly. AngularJS’s data binding and dependency injection eliminate much of the code you would otherwise have to write. And it all happens within the browser, making it an ideal partner with any server technology.

AngularJS is what HTML would have been, had it been designed for applications. HTML is a great declarative language for static documents.

AngularJS is an open-source Front-end JavaScript framework. Its goal is to augment browser-based applications with Model–View–Controller (MVC) capability and reduce the amount of JavaScript needed to make web applications functional. These type of apps are also known as Single-Page Applications.

Though AngularJS is known to have a steep learning curve, it remains to be popular amongst developers for several reasons. A completely free framework like Angular helps to use HTML as a template language, creates RICH Internet Application and offers its developers a client-side application

The impedance mismatch between dynamic applications and static documents is often solved with:

  • a library – a collection of functions which are useful when writing web apps. Your code is in charge and it calls into the library when it sees fit. E.g., jQuery.
  • frameworks – a particular implementation of a web application, where your code fills in the details. The framework is in charge and it calls into your code when it needs something app specific. E.g., durandalember, etc.

AngularJS takes another approach. It attempts to minimize the impedance mismatch between document centric HTML and what an application needs by creating new HTML constructs. AngularJS teaches the browser new syntax through a construct we call directives. Examples include:

  • Data binding, as in {{}}.
  • DOM control structures for repeating, showing and hiding DOM fragments.
  • Support for forms and form validation.
  • Attaching new behavior to DOM elements, such as DOM event handling.
  • Grouping of HTML into reusable components.

Why Do We Need a Framework?

If you’re not sure what a JavaScript (or client-side) framework is, that’s a technology providing us the right tools to build a web application while also defining how it should be designed and how the code should be organized.

Most JS frameworks these days are opinionated, meaning they have their own philosophy of how the web app should be built and you may need to spend some time to learn the core concepts. Other solutions, like Backbone, do not instruct developers on how they should craft the project, thus some people even call such technologies simply libraries, rather than frameworks.

Actually, JavaScript frameworks emerged not that long ago. I remember times where websites were built with poorly structured JS code (in many cases, powered by jQuery). However, client-side UIs have become more and more complex, and JavaScript lost its reputation as a “toy” language. Modern websites rely heavily on JS and the need to properly organize (and test!) the code has arisen.

Advantages of AngularJS

AngularJS is popular among web developers for a couple of reasons:

  • Two-way data binding – Since AngularJS’s architecture binds JavaScript and HTML, the code for both are already in sync. Thus, the framework saves a lot of time for developers.
  • Directives – The framework extends HTML files’ functionality with directives. To enable directives, developers add the ng- prefix to HTML attributes.
  • Code Structure – AngularJS provides you with templates; allowing you to produce apps with clean code. Not only does it save time, but also makes it easier for you to modify or fix your apps.
  • Testing – The framework supports unit and integration testing.
  • Bright Future – Angular’s future is bright because of its functionality and popularity. Its user base keeps on growing, and it has loads of in-depth documentation that is constantly updated.
  • Mobile and Desktop Compatibility – AngularJS can run on most web browsers. Not only on desktop, but also mobile devices.

Before Learning AngularJS

You need to remember that AngularJS is a JavaScript framework. Consequently, you need to understand the basics of the programming language before learning AngularJS.

The same applies to related programming languages such as HTML, CSS, and AJAX.

Knowing the basics of JavaScript before learning AngularJS will enable you to:

  • Follow the fast development of Angular
  • Know when to use the framework
  • Become a flexible and innovative developer

A complete client-side solution

AngularJS is not a single piece in the overall puzzle of building the client-side of a web application. It handles all of the DOM and AJAX glue code you once wrote by hand and puts it in a well-defined structure. This makes AngularJS opinionated about how a CRUD (Create, Read, Update, Delete) application should be built. But while it is opinionated, it also tries to make sure that its opinion is just a starting point you can easily change. AngularJS comes with the following out-of-the-box:

  • Everything you need to build a CRUD app in a cohesive set: Data-binding, basic templating directives, form validation, routing, deep-linking, reusable components and dependency injection.
  • Testability story: Unit-testing, end-to-end testing, mocks and test harnesses.
  • Seed application with directory layout and test scripts as a starting point.


Learn one way to build applications with Angular and reuse your code and abilities to build apps for any deployment target. For web, mobile web, native mobile and native desktop.


Achieve the maximum speed possible on the Web Platform today, and take it further, via Web Workers and server-side rendering.

Angular puts you in control over scalability. Meet huge data requirements by building data models on RxJS, Immutable.js or another push-model.


Build features quickly with simple, declarative templates. Extend the template language with your own components and use a wide array of existing components. Get immediate Angular-specific help and feedback with nearly every IDE and editor. All this comes together so you can focus on building amazing apps rather than trying to make the code work.


From prototype through global deployment, Angular delivers the productivity and scalable infrastructure that supports Google’s largest applications.

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