Rxjs quiz

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

What does a `Subject` give you over a plain Observable?

1. What does a `Subject` give you over a plain Observable?
2. What does `merge(a, b)` do?
3. How do you concatenate two Observables sequentially?
4. What does `map(fn)` do?
5. `tap(fn)` is used for:
6. What is the difference between a hot and a cold Observable?
7. A subscription returned by `.subscribe()` is:
8. `BehaviorSubject` vs `Subject` — the key difference?
9. What does `filter(pred)` do?
10. `debounceTime(300)` — what does it do?
11. Why must you `unsubscribe()` from an Observable subscription?
12. `from([1, 2, 3])` vs `of([1, 2, 3])` — what is the difference?

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