React Interview Questions

Master React with our comprehensive collection of 26 interview questions covering everything from basics to advanced concepts.

26 Questions

Curated

5 Categories

Organized

Detailed

Answers

Basic Questions

11 Questions
1

What is React, and how does it differ from other JavaScript frameworks?

2

What are the key features of React?

3

What is JSX, and how does it work in React?

4

What is the Virtual DOM, and how does React use it?

5

What are components in React?

6

What is the difference between functional and class components?

7

What are props in React?

8

What is state in React?

9

What are React Hooks, and why were they introduced?

10

What is the useState Hook, and how does it work?

11

What are controlled and uncontrolled components?

Intermediate Questions

5 Questions
21

What is the useEffect Hook, and when should you use it?

22

What is the useCallback Hook?

23

What is the Context API, and how is it used?

24

What is React.memo, and when should you use it?

25

What is the useReducer Hook?

Advanced Questions

4 Questions
41

What are Higher-Order Components (HOCs)?

42

What is code splitting in React?

43

What is lazy loading in React?

44

What are Error Boundaries?

Performance & Optimization

4 Questions
61

How do you optimize performance in React?

62

What is reconciliation in React?

63

What are keys in React, and why are they important?

64

What is the difference between useMemo and useCallback?

State Management

2 Questions
81

What is Redux, and how does it work with React?

82

What is the difference between Redux Toolkit and traditional Redux?

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