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React interview questions · IT Interview Practice
Home
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Frontend
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React
Frontend
React
Component-based UI library: virtual DOM, hooks and state management.
30
questions
updated weekly
Junior
10
Middle
12
Senior
8
React questions
12 / 30 shown
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›
What are the Rules of Hooks? Why can't you call a hook conditionally?
Middle
#Hooks
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What are common pitfalls with the useEffect dependency array and cleanup?
Middle
#Hooks
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How does useContext and the Context API work?
Middle
#State
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When would you use useReducer instead of useState?
Middle
#Hooks
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What are the main use cases for useRef?
Middle
#Hooks
Details →
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What are custom hooks and how do you write one?
Middle
#Hooks
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What does "lifting state up" mean, and how does it relate to prop drilling?
Middle
#State
Details →
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What does React.memo do and when is it worth using?
Middle
#Performance
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What are forwardRef and useImperativeHandle for?
Middle
#Hooks
Details →
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What are error boundaries and what do they catch?
Middle
#Error Handling
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What are React portals and when are they useful?
Middle
#Rendering
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How do you fetch data in React and avoid race conditions?
Middle
#Data
Details →
