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 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 difference between state and props in React?
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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?
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React
What is the purpose of callback function argument format of `setState()` in React and when should it be used?
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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?
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React
What is the `useReducer` hook in React and when should it be used?
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React
What is the `useId` hook in React and when should it be used?
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React
What does re-rendering mean in React?
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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
Why does React recommend against mutating state?
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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
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?
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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?
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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
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React
How do you handle asynchronous data loading in React applications?
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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 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?
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React
What is React Suspense and what does it enable?
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React
Explain what happens when the `useState` setter function is called in React
Topics
React

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