React Interview Question

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React Topics

1. React Context
2. Hooks:
   • useState
   • useEffect
   • useReducer
3. Basics of React Router:
   • Understanding React Router v6
4. Memoization Hooks:
   • useMemo
   • useCallback
5. Redux:
   • Setting up Redux
   • Implementing Redux Dev Toolkit
6. API Integration
7. Peer Dependencies:
   • What are they?

Advanced Questions

1. What is a pure function?
2. What is a Higher-Order Component (HOC)?
   • Examples of HOCs you have used.
3. What is render props?
4. Custom Hooks:
   • Difference between custom hooks, functions, and components.
5. How does the Virtual DOM work in React?
6. What is reconciliation in React?
7. Controlled vs. Uncontrolled Components:
   • Which one is better and why?
8. What is memoization and how can it be achieved in React?
9. Toolchains in React:
   • What is a toolchain?
10. Code Splitting in React:
    • How to achieve it?
11. JavaScript Concepts:
    • What is hoisting?
    • Difference between Array.forEach() and Array.map().
    • Explain the event loop.
    • Name one JavaScript engine.
    • Is JavaScript object-oriented? If not, what type is it?
12. React Props:
    • What is the children prop?
13. React Portals:
    • What are they and why are they useful?
14. Performance Optimization in React:
    • Common techniques.
15. Refs in React:
    • How to create refs.
16. Spread Operator (...) in React:
    • What do these three dots do?

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