Rxjs quiz

Test your Rxjs knowledge with a free interactive quiz — 50 questions with answers and explanations. No signup needed to play.

What is the `pipe()` method for?

1. What is the `pipe()` method for?
2. `tap(fn)` is used for:
3. `mapTo(value)` is similar to `map(() => value)`. When use it?
4. What does `map(fn)` do?
5. What does `of(1, 2, 3)` produce?
6. What is the difference between a hot and a cold Observable?
7. `distinctUntilChanged()` — what does it do?
8. `debounceTime(300)` — what does it do?
9. What does `startWith(value)` do?
10. Why must you `unsubscribe()` from an Observable subscription?
11. How do you start an Observable?
12. `BehaviorSubject` vs `Subject` — the key difference?

More quizzes