React Interview Questions

React Interview PlaybookA comprehensive React interview guide that covers core concepts and interview-specific React tips

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GUIDES

What is the difference between state and props in React?
Topics
React
What is React? Describe the benefits of React
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React
What is the difference between React Node, React Element, and a React Component?
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React
What is JSX and how does it work?
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React
What is the purpose of the `key` prop in React?
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React
What is the consequence of using array indices as the value for `key`s in React?
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React
What is the difference between controlled and uncontrolled React Components?
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React
What are some pitfalls about using context in React?
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React
What are the benefits of using hooks in React?
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React
What are the rules of React hooks?
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React
What is the difference between `useEffect` and `useLayoutEffect` in React?
Topics
React
What is the purpose of callback function argument format of `setState()` in React and when should it be used?
Topics
React
What does the dependency array of `useEffect` affect?
Topics
React
What is the `useRef` hook in React and when should it be used?
Topics
React
What is the `useCallback` hook in React and when should it be used?
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React
What is the `useMemo` hook in React and when should it be used?
Topics
React
What is the `useReducer` hook in React and when should it be used?
Topics
React
What is the `useId` hook in React and when should it be used?
Topics
React
What are React Fragments used for?
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React
What is `forwardRef()` in React used for?
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React
How do you reset a component's state in React?
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React
What are error boundaries in React for?
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React
How do you test React applications?
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React
What is React strict mode and what are its benefits?
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React
How do you localize React applications?
Topics
ReactInternationalization
What is code splitting in a React application?
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React
How would one optimize the performance of React contexts to reduce rerenders?
Topics
ReactPerformance
What are higher order components in React?
Topics
React
What is the Flux pattern and what are its benefits?
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React
Explain one-way data flow of React and its benefits
Topics
React
How do you handle asynchronous data loading in React applications?
Topics
ReactAsync
Explain server-side rendering of React applications and its benefits?
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React
Explain static generation of React applications and its benefits?
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React
Explain the presentational vs container component pattern in React
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React
What are some common pitfalls when doing data fetching in React?
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React
What are render props in React and what are they for?
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React
What are some React anti-patterns?
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React
How do you decide between using React state, context, and external state managers?
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React
Explain the composition pattern in React
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React
What is React Suspense and what does it enable?
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React
Explain what happens when `setState` is called in React
Topics
React
What does re-rendering mean in React?
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React
Why does React recommend against mutating state?
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React
Explain what React hydration is
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React
What are React Portals used for?
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React
How do you debug React applications?
Topics
React
What is virtual DOM in React?
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React
How does virtual DOM in React work? What are its benefits and downsides?
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React
What is React Fiber and how is it an improvement over the previous approach?
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React
What is reconciliation in React?
Topics
React

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