AngularJS and Angular are two different frameworks for building web applications, with Angular being a more recent and different version of AngularJS. Here are some of the key differences between AngularJS and Angular:
- Architecture: AngularJS is based on the Model-View-Controller (MVC) architecture, while Angular uses a component-based architecture that is closer to the Model-View-ViewModel (MVVM) pattern.
- Language: AngularJS is written in JavaScript, while Angular is written in TypeScript, a superset of JavaScript that includes features such as static typing and decorators.
- Performance: Angular is designed to be faster and more efficient than AngularJS. This is achieved through a number of performance optimizations, including Ahead-of-Time (AOT) compilation and a more efficient change detection mechanism.
- Size: AngularJS is a relatively large framework, with a file size of around 150 KB. Angular, on the other hand, is a smaller framework, with a file size of around 50 KB.
- Templates: AngularJS templates are based on a markup language called AngularJS Expression Language (AEL), while Angular templates use HTML with additional features such as directives and bindings.
- Compatibility: AngularJS is not compatible with Angular, meaning that applications built with AngularJS cannot be easily migrated to Angular without significant changes to the code.
In summary, while AngularJS and Angular share some similarities, they are fundamentally different frameworks with different architectures, languages, and performance characteristics. Angular is a more modern, efficient, and scalable framework, while AngularJS is an older, more established framework that may be more suitable for smaller or simpler projects.