🅰️ 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 blocksWhat is Angular and how does it differ from AngularJS?
EasyAngular is a TypeScript-based framework (v2+), while AngularJS (v1) used JavaScript. Angular has components, TypeScript, and better performance.
typescript
Explain Angular component lifecycle hooks
Mediumtypescript
What is Dependency Injection in Angular?
Mediumtypescript
Explain RxJS Observables and common operators
Hardtypescript
What are Angular Signals?
Mediumtypescript
Explain Angular change detection strategies
Hardtypescript
What is the difference between Template-driven and Reactive Forms?
Mediumtypescript
How does Angular Router work?
Mediumtypescript
What are Angular Directives?
Easytypescript
Explain Angular Pipes
Easytypescript
What are Standalone Components?
Mediumtypescript
How do you handle HTTP requests in Angular?
Mediumtypescript
What is NgRx and state management in Angular?
Hardtypescript
How do you optimize Angular application performance?
Hardtypescript
Explain Angular Guards and Route Protection
Mediumtypescript
What is ViewChild and ContentChild?
Mediumtypescript
How do components communicate in Angular?
Mediumtypescript
What are Angular Modules (NgModule)?
Easytypescript
Explain Angular testing with Jasmine and TestBed
Hardtypescript
What is Zone.js in Angular?
Hardtypescript
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