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Key features and concepts of AngularJS include:
Two-Way Data Binding: One of AngularJS's most prominent features is its two-way data binding, which automatically synchronizes data between the model (data) and the view (UI). Changes in the model are reflected in the view, and vice versa, without the need for manual DOM manipulation.
MVC Architecture: AngularJS follows the Model-View-Controller (MVC) architectural pattern. It helps developers separate the application's concerns into different components, making code organization and maintenance easier.
Directives: Directives are special HTML attributes that extend the functionality of HTML elements. They allow developers to create custom behaviors, manipulate the DOM, and add dynamic features to the UI.
Templates: AngularJS uses templates to define the structure and layout of the application's views. Templates can include data binding expressions, allowing dynamic content to be inserted into the HTML.
Dependency Injection: Dependency Injection (DI) is a design pattern used in AngularJS to manage dependencies between different components. It helps ensure loose coupling and easier testing of individual components.
Controllers: Controllers in AngularJS are responsible for handling user input and updating the model accordingly. They act as intermediaries between the view and the model.
Services: Services are singleton objects that provide common functionality or data that can be shared across different parts of the application. Services are used for data retrieval, business logic, and communication with servers.
Filters: Filters in AngularJS allow developers to format and transform data displayed in the UI. They can be used to perform tasks like sorting, filtering, and formatting.
Routing: AngularJS provides a routing module that allows developers to build single-page applications (SPAs) with multiple views and routes. This enables seamless navigation without full page reloads.
Testing: AngularJS comes with testing tools and libraries that facilitate unit testing and end-to-end testing of applications, ensuring code quality and robustness.
Modularity: AngularJS encourages the development of modular applications, where different components are organized into modules, enhancing code reusability and maintainability.
Extensibility: AngularJS is extensible, allowing developers to create custom directives, services, and other components to fit specific application requirements.
It's important to note that while AngularJS was widely used and influential in the early days of web development, it has been succeeded by Angular (also known as Angular 2+), a complete rewrite of the framework with significant changes and improvements. Developers interested in using Angular for modern web applications should consider learning Angular instead of AngularJS.