Angular Interview Questions: Quick One-Liners for Main Topics

Looking to crack your next Angular interview? Explore these concise one-liner Angular interview questions covering key topics like Observables, Directives, Lifecycle Hooks, Services, Dependency Inject

1. BehaviorSubject: Special Subject that holds current value and emits to new subscribers.
2. Subject: Multicast Observable, emits to multiple subscribers.
3. @Input: Decorator to pass data from parent to child component.
4. @Output: Decorator to emit data from child to parent component.
5. @EventEmitter: Emits custom events to parent components.
6. Loading: Shows progress/spinner while data is being fetched.
7. Decorator: A function to modify class/variable behavior.
8. Directive: Custom behavior applied to elements (structural/attribute).
9. Service: Shared logic across components using dependency injection.
10. Pipe: Transforms output in templates (e.g., date, currency).
11. Guard: Protects routes based on conditions (AuthGuard).
12. Provider: Supplies services/instances to Angular modules/components.
13. Module: Logical group of components, directives, and services.
14. Interceptor: Intercepts and modifies HTTP requests/responses.
15. Wild Card Route: Handles undefined routes using `**`.
16. Promise & Async: Handles async operations, resolves single value.
17. Subject Type: BehaviorSubject, ReplaySubject, AsyncSubject, etc.
18. Binding: Connects template and component data (e.g., one-way, two-way).
19. HttpClient: Angular service to make HTTP requests.
20. HttpInterceptor: Intercepts and modifies HTTP requests globally.
21. Observables: Streams of data, can emit multiple values over time.
22. Form: Handles user input using reactive or template-driven forms.
23. LifeCycle Hooks: Methods triggered at different component lifecycle stages (ngOnInit, ngOnDestroy).
24. Dependency Injection: Design pattern to inject services into components.
25. Singleton: A single instance of a service throughout the app.
26. ViewContainerRef: Accesses and manipulates views dynamically.
27. Basics of Observables and Observers: Observables emit data; Observers consume it.
28. Common RxJS Operators: Transform streams (map, filter, mergeMap, switchMap).
29. Difference: Promise vs Observable: Promise resolves once; Observable streams multiple values.

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