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Lifecycle hooks in angular, Routing, Lazy loading, IIFE, ng build and ng serve difference, custom directive to change background color of div on hover and some other questions as well. I do not remember them well.
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Senior Angular Developer

Interviewed at Tata Consultancy Services

3.5★
Nov 29, 2021

Lifecycle hooks in angular, Routing, Lazy loading, IIFE, ng build and ng serve difference, custom directive to change background color of div on hover and some other questions as well. I do not remember them well.

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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