Topic

React

Real interview questions with expert answers, plain-English explanations, and practical examples. (6 questions)

Deloitte Frontend Developer React

A complex Deloitte React application is experiencing performance bottlenecks. How would a frontend developer diagnose and optimize its rendering and state management?

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Intuit React Developer React

How do React’s memoization features (e.g., `React.memo`, `useMemo`, `useCallback`) improve performance, and when should a React Developer use each?

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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`?

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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?

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Flipkart Frontend Developer React

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

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Cognizant React Developer React

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

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