Angular vs. AngularJS

Attribute	Angular	AngularJS
Version	Latest version is Angular 12	Latest version is AngularJS 1.7
Language	Written in TypeScript	Written in JavaScript
Architecture	Component-based architecture	Module-based architecture
Performance	Improved performance compared to AngularJS	Slower performance compared to Angular
Dependency Injection	Hierarchical Dependency Injection system	Global Dependency Injection system
Mobile Support	Improved mobile support	Less optimized for mobile development

Introduction

Angular and AngularJS are both popular frameworks for building web applications. While they share some similarities, they also have key differences that developers should be aware of when choosing which one to use for their projects.

Architecture

AngularJS is based on the Model-View-Controller (MVC) architecture, where the model represents the data, the view is the user interface, and the controller manages the communication between the two. Angular, on the other hand, uses a component-based architecture, where components are self-contained and reusable pieces of code that define the structure and behavior of a part of the user interface.

Performance

AngularJS uses two-way data binding, which can sometimes lead to performance issues, especially with large applications. Angular, on the other hand, uses one-way data binding by default, which can improve performance by reducing the number of watchers and digest cycles needed to update the view.

Language

AngularJS is written in JavaScript, while Angular is written in TypeScript, a superset of JavaScript that adds static typing and other features to the language. TypeScript can help catch errors at compile time and improve code quality, making it a preferred choice for many developers.

Dependency Injection

Both Angular and AngularJS support dependency injection, a design pattern that allows components to be loosely coupled and easily testable. However, Angular has a more advanced dependency injection system that provides better support for hierarchical injectors and lazy loading of modules.

Tooling

Angular comes with a command-line interface (CLI) that provides a set of tools for generating components, services, and other artifacts, as well as for building and testing applications. AngularJS, on the other hand, relies on third-party tools and plugins for similar functionality, which can sometimes lead to inconsistencies and compatibility issues.

Community Support

Angular has a larger and more active community than AngularJS, with more resources, tutorials, and libraries available for developers. This can make it easier to find help and solutions to common problems when working with Angular, as well as to stay up-to-date with the latest best practices and trends in web development.

Conclusion

While both Angular and AngularJS are powerful frameworks for building web applications, they have distinct differences in terms of architecture, performance, language, dependency injection, tooling, and community support. Developers should carefully consider these factors when choosing which framework to use for their projects, taking into account their specific requirements and preferences.