AngularJS vs Angular (Angular 2+)

🧩 1. Architecture

Feature AngularJS (v1.x) Angular (v2+)
Pattern MVC (Model-View-Controller) Component-based architecture
Main Building Block Controllers, Scope, Directives Components, Modules, Services
Data Binding Two-way data binding One-way and two-way data binding (more controlled)

⚙️ 2. Language

Feature AngularJS Angular
Language Used JavaScript (ES5) TypeScript (superset of JavaScript)
Type Safety No static typing Strongly typed with TypeScript

⚡ 3. Performance

Feature AngularJS Angular
Speed Slower due to digest cycle and watchers Faster due to improved change detection and Ahead-of-Time (AOT) compilation
Mobile Support Poor Designed with mobile support in mind

🧠 4. Dependency Injection

Feature AngularJS Angular
DI Implementation Limited and less flexible Fully-fledged, hierarchical dependency injection system

🎨 5. UI & Templates

Feature AngularJS Angular
Templates Written in plain HTML with directives (ng-model, ng-repeat) HTML + Angular syntax (*ngFor, [(ngModel)])
Directive Syntax ng- prefix *, [], and () syntax

🧱 6. Modularity

Feature AngularJS Angular
Modules No built-in module system Uses Angular Modules (NgModule)
Code Organization Hard to scale large apps Easily scalable with modules and lazy loading

🔄 7. Routing

Feature AngularJS Angular
Router ngRoute or ui-router Angular Router (powerful and feature-rich)
Lazy Loading Not supported Supported for better performance

🧩 8. Tools & Build System

Feature AngularJS Angular
Setup Simple script include CLI-based setup using Angular CLI
Build Tools None (manual setup) Built-in tooling for build, test, deploy

🧰 9. Testing

Feature AngularJS Angular
Testing Framework Jasmine, Karma Jasmine, Karma, Jest (more modern support)

🗓️ 10. Version History

Feature AngularJS Angular
Initial Release 2010 2016
Current Status Discontinued (End of Support: Dec 2021) Actively maintained and updated

💬 Summary

Aspect AngularJS Angular
Architecture MVC Component-based
Language JavaScript TypeScript
Performance Slower Faster
Scalability Limited High
Support Deprecated Actively supported

✅ In short:

  • AngularJS → Old framework, JavaScript-based, not suitable for large modern apps.

  • Angular (2+) → Modern framework, TypeScript-based, modular, fast, and scalable.

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