What is AngularJS?

 What is AngularJS?

AngularJS is a JavaScript-based open-source front-end web application framework. It was originally developed by Google and released in 2010. AngularJS allows developers to build dynamic and interactive web applications by extending HTML's syntax and providing a set of powerful features.

AngularJS follows the model-view-controller (MVC) architectural pattern, where the application logic is separated from the presentation layer. It provides a declarative approach to building web applications, allowing developers to define the behavior of the application through HTML attributes and directives.

Key features of AngularJS include:

1. Two-way data binding: AngularJS enables automatic synchronization of data between the model and the view. Any changes made to the model are immediately reflected in the view, and vice versa.

2. Dependency injection: AngularJS has a built-in dependency injection system, which helps manage dependencies between different components of an application. It makes it easier to develop, test, and maintain code by promoting modular and reusable components.

3. Directives: Directives are a fundamental aspect of AngularJS, allowing developers to extend HTML with new attributes and elements. Directives enable the creation of custom behaviors and reusable components, enhancing code organization and modularity.

4. Templating: AngularJS provides a powerful templating system that allows developers to define dynamic views using plain HTML templates. Templating includes features like conditionals, loops, and filters, making it easier to manipulate and display data in the view.

5. Testing: AngularJS includes robust testing support with tools like unit testing and end-to-end testing. This facilitates the creation of reliable and maintainable code by allowing developers to write tests for their components and ensure their proper functionality.

It's important to note that AngularJS is an older version of the Angular framework. The current version, as of my knowledge cutoff in September 2021, is Angular (also known as Angular 2+). Angular is a complete rewrite of AngularJS and offers improved performance, enhanced features, and a different architectural approach.