Angular Interview Questions

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Explain the difference between mergeMap, switchMap, and concatMap with real-time use cases. How does forkJoin differ from combineLatest? What happens when an observable inside a switchMap returns another observable? What is the lifecycle of a JWT token? How do you implement token refresh logic in Angular? What are interceptors and how do you use them for JWT handling?
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Software Engineer(Angular)

Interviewed at InvestCloud

2.1
Jul 22, 2025

Explain the difference between mergeMap, switchMap, and concatMap with real-time use cases. How does forkJoin differ from combineLatest? What happens when an observable inside a switchMap returns another observable? What is the lifecycle of a JWT token? How do you implement token refresh logic in Angular? What are interceptors and how do you use them for JWT handling?

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