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?
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?
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`?
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?
Flipkart
Frontend Developer
React
How does React’s reconciliation (virtual DOM diffing) actually decide what to re-render?
Cognizant
React Developer
React