Difference between Angular & AngularJS; explain Angular modules and their importance?

AngularJS vs Angular

1. AngularJS (1.x)

• Released: 2010

• Language: JavaScript

• Architecture: MVC (Model-View-Controller)

• Data Binding: Two-way data binding by default

• Performance: Slower for large applications due to digest cycle and dirty checking

• Directives: ng- prefixed, e.g., ng-model, ng-repeat

• Tooling: Minimal CLI support; mostly manual setup

• Mobile Support: Not optimized

1. Angular (2+)

• Released: 2016+ (complete rewrite)

• Language: TypeScript (superset of JavaScript)

• Architecture: Component-based

• Data Binding: Supports both one-way and two-way binding; more efficient change detection

• Performance: Faster and more scalable

• Directives: Structural (*ngFor, *ngIf) and Attribute ([ngClass], [ngStyle])

• Tooling: Full Angular CLI for scaffolding, building, and testing

• Mobile Support: Optimized for mobile and desktop

Key Differences in Simple Terms:

• AngularJS → older, JavaScript, MVC-based, slower, harder for large apps.

• Angular → modern, TypeScript, component-based, faster, scalable, mobile-friendly.

What are Angular modules, and why are they important?

Angular NgModules or Angular modules Angular modules, also known as NgModules, are a fundamental concept in Angular that facilitate the organization of an application into functional units. They are constructs of components, directives, pipes and services and bundle them together so that Angular is aware of how to assemble the application and execute it.

Structure and Organization :Angular modules enable you to make a big application an easy to manage smaller one. Every module is usually specialized in terms of features or functionality and this ensures that the app can be more maintainable and scalable.

Key Properties of an Angular Module

• Declarations: The items, instructions, and pipes pertaining to this module.
• Imports: Other modules whose classes are exported are required by the components of this one.

• Exports: The declarations that must be made obtainable to other modules.

• Providers: Services that are added to the dependency injection system of the app by the module.

• Bootstrap: The bootstrap element Angular should start with when the app is initiated with the help of the module.
  

Importance of Angular Modules

• Code Organization: Helps divides features logically and this allows to maintain and scale large programs with ease.

• Lazy Loading: Modes are on-demand loaded to enhance performance of applications.
• Dependency Management: Controls what parts and services other components of the application can see.

• Reusability: You are able to develop shared modules of common functionality and reuse them in various portions of your application.

Concisely, Angular modules play a critical role in modular programming, effective dependency management, and performance improvement in Angular applications.