RxJS MCQs with answers Page - 4

Here, you will find a collection of MCQ questions on RxJS. Go through these questions to enhance your preparation for upcoming examinations and interviews.

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F

Fox Root • 195 Points
Mover

Q. What does throttleTime() do?

  • (A) Delays all emissions
  • (B) Limits emission rate by ignoring values for a period
  • (C) Repeats emissions
  • (D) Cancels subscription

F

Fox Root • 195 Points
Mover

Q. Which operator converts a Promise into an Observable?

  • (A) from()
  • (B) of()
  • (C) defer()
  • (D) timer()

F

Fox Root • 195 Points
Mover

Q. Which operator ensures only one inner Observable runs at a time and ignores new ones?

  • (A) switchMap()
  • (B) mergeMap()
  • (C) concatMap()
  • (D) exhaustMap()

F

Fox Root • 195 Points
Mover

Q. Which operator runs inner Observables sequentially?

  • (A) mergeMap()
  • (B) concatMap()
  • (C) switchMap()
  • (D) exhaustMap()

F

Fox Root • 195 Points
Mover

Q. Which operator emits only when the value changes?

  • (A) distinctUntilChanged()
  • (B) filter()
  • (C) scan()
  • (D) every()

F

Fox Root • 195 Points
Mover

Q. What is a cold Observable?

  • (A) An Observable shared among all subscribers
  • (B) An Observable that starts execution on subscription
  • (C) An Observable stored in memory
  • (D) An Observable that never completes

F

Fox Root • 195 Points
Mover

Q. What is a hot Observable?

  • (A) Starts emitting before subscription
  • (B) Always throws errors
  • (C) Runs only once
  • (D) Only works with HTTP

F

Fox Root • 195 Points
Mover

Q. Which operator groups emitted values by a key?

  • (A) groupBy()
  • (B) partition()
  • (C) filter()
  • (D) map()

F

Fox Root • 195 Points
Mover

Q. Which operator delays emissions for a specific time?

  • (A) delay()
  • (B) pause()
  • (C) wait()
  • (D) sleep()

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