Topic

React

Real interview questions with expert answers, plain-English explanations, and practical examples. (4 questions)

Mphasis React Developer React

How does React’s component lifecycle enable efficient state and side effect management in a complex application, and when would you use `useEffect` for data fetching versus `useLayoutEffect`?

Read answer →
ServiceNow Full Stack Developer React

How do you manage global state in a complex React application, and when would you choose Context API versus a library like Redux?

Read answer →
Flipkart Frontend Developer React

How does React’s reconciliation (virtual DOM diffing) actually decide what to re-render?

Read answer →
Cognizant React Developer React

What’s the difference between useMemo and useCallback, and when does each actually matter for performance?

Read answer →