🅰️ Angular Interview Questions
Master Angular interviews with components, RxJS, DI, and modern features
⚡ 15-Minute Angular Cheatsheet
🏗️ Core Concepts
Components: Building blocks with template + logic
Modules: Organize related code (NgModule)
Services: Shared logic, injected via DI
Directives: Modify DOM behavior
Pipes: Transform template data
🔄 RxJS Essentials
Observable - Async data streamSubject - Observable + ObserverBehaviorSubject - Has current valuepipe() - Chain operatorsasync - Auto subscribe in template💉 Dependency Injection
@Injectable() - Make injectableprovidedIn: 'root' - SingletonHierarchical: Component-level providers
inject() - Function-based DI✨ Angular 17+ Features
signal() - Reactive primitivescomputed() - Derived signals@if/@for - New control flowStandalone: No NgModule needed
defer - Lazy load blocksAngular is a TypeScript-based framework (v2+), while AngularJS (v1) used JavaScript. Angular has components, TypeScript, and better performance.
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Interview Tips for Angular
- ✓ Understand component lifecycle hooks and their order
- ✓ Master RxJS operators: map, switchMap, mergeMap, takeUntil
- ✓ Know dependency injection and providedIn options
- ✓ Understand change detection strategies (Default vs OnPush)
- ✓ Know Angular 17+ features: Signals, new control flow, defer
- ✓ Practice Reactive Forms validation patterns
- ✓ Understand lazy loading and performance optimization
- ✓ Be ready to explain NgRx/state management patterns