Freshers (0–2 years)

Reactive Programming Interview Questions for Freshers

Preparing for your first Reactive Programming interviews? This set is curated for freshers and early-career developers (0–2 years): the 25 questions that come up most for entry-level roles, each with a clear answer, example code and follow-ups.

25Questions13Beginner12Intermediate

25 Reactive Programming questions

  1. 1Testing ObservablesIntermediate
  2. 2distinctUntilChanged operatorIntermediate
  3. 3Buffering vs WindowingIntermediate
  4. 4What is Multicasting?Intermediate
  5. 5What is retry operator?Intermediate
  6. 6Schedulers in Reactive ProgrammingIntermediate
  7. 7combineLatest vs zipIntermediate
  8. 8switchMap vs mergeMapIntermediate
  9. 9Debounce vs Throttle in Reactive ProgrammingIntermediate
  10. 10What are Stream basics?Beginner
  11. 11How is error handled in Observables?Beginner
  12. 12What is a Subject?Beginner
  13. 13Why do we unsubscribe?Beginner
  14. 14What is Subscription in Reactive Programming?Beginner
  15. 15What are RxJS Operators?Beginner
  16. 16What is Observer Pattern?Beginner
  17. 17Observable vs PromiseBeginner
  18. 18What is Reactive Programming?Beginner
  19. 19Reactive Programming Interview Question 2 (Free)Intermediate
  20. 20Reactive Programming Interview Question 5 (Free)Intermediate
  21. 21Reactive Programming Interview Question 4 (Free)Beginner
  22. 22Reactive Programming Interview Question 1 (Free)Beginner
  23. 23Reactive Programming Advanced Interview Question 10Beginner
  24. 24Reactive Programming Advanced Interview Question 8Intermediate
  25. 25Reactive Programming Advanced Interview Question 7Beginner

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Frequently asked questions

Which Reactive Programming questions do freshers (0–2 years) get asked?

This page collects 25 Reactive Programming interview questions aligned with freshers (0–2 years), ranging across the difficulty levels that match that experience band.

How do I prepare for a Reactive Programming interview with my experience level?

Work through these questions in order, make sure you can explain each answer out loud, and pay attention to the real-world examples and follow-ups — interviewers at this level care as much about reasoning as the final answer.

Do the answers include code and examples?

Yes — answers include explanations, code examples where relevant, common mistakes to avoid and follow-up questions so you are ready for the full interview conversation.