React Interview Question Answer




Question : 1

What is React.js?


Question : 2

What are the key features of React.js?


Question : 3

What is JSX?


Question : 4

What is the difference between React and ReactDOM?


Question : 5

Explain the concept of Virtual DOM in React.


Question : 6

What are the lifecycle methods in React?


Question : 7

What is the significance of render() in React?


Question : 8

What is the purpose of setState()?


Question : 9

What is the difference between state and props in React?


Question : 10

What is the purpose of keys in React lists?


Question : 11

What is the significance of the useEffect hook in React?


Question : 12

What is the difference between controlled and uncontrolled components in React?


Question : 13

What is React Router?


Question : 14

What is the purpose of componentDidMount() lifecycle method?


Question : 15

What is the significance of the key prop in React?


Question : 16

What are React refs?


Question : 17

What are React hooks?


Question : 18

Explain the concept of conditional rendering in React.


Question : 19

What is the purpose of the setState() callback function?


Question : 20

What is the significance of the useCallback hook?


Question : 21

How can you optimize performance in React?


Question : 22

What is the purpose of the React.Fragment component?


Question : 23

Explain the concept of prop drilling.


Question : 24

What is the significance of the useReducer hook?


Question : 25

How can you handle forms in React?


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