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React js interview questions for 3 year experience - Concepts

 For a React.js interview at a 3-year experience level, you should focus on the following topics:

1. Core React Concepts

  • React Component Lifecycle (class & functional components)
  • React Hooks (useState, useEffect, useContext, useMemo, useCallback, useRef, etc.)
  • JSX, Virtual DOM, and Reconciliation
  • Props vs. State
  • Controlled vs. Uncontrolled Components
  • Error Boundaries

2. Advanced React

  • Higher-Order Components (HOCs)
  • Render Props Pattern
  • Context API vs. Redux (when to use what)
  • React Suspense & Lazy Loading
  • Custom Hooks
  • React Portals

3. State Management

  • Local State (useState, useReducer)
  • Global State Management (Redux Toolkit, Context API)
  • Apollo Client for GraphQL State Management

4. Performance Optimization

  • React.memo, useMemo, useCallback
  • Code Splitting & Lazy Loading
  • Avoiding unnecessary re-renders
  • Profiling React Apps

5. React with TypeScript (if applicable)

  • Props & State Types
  • Function Components with TypeScript
  • Utility Types in React

6. React Testing

  • Jest & React Testing Library
  • Unit Testing vs. Integration Testing
  • Mocking API calls

7. API Handling

  • Fetch & Axios
  • Handling API Errors & Loading States
  • GraphQL with Apollo Client

8. React with Next.js (optional but good to know)

  • SSR, SSG, ISR
  • API Routes in Next.js
  • Image Optimization

9. UI Libraries & Styling

  • Styled Components, Emotion
  • Tailwind CSS, Material-UI, Ant Design

10. React Interview Questions

  • Theoretical Questions

    • Difference between functional and class components?
    • How does React handle reconciliation?
    • What is the purpose of useEffect?
    • When to use useMemo vs. useCallback?
    • How does React handle form validation?

  • Coding Challenges

    • Implement a custom hook (e.g., useFetch, useDebounce)
    • Build a To-Do app with CRUD operations
    • Optimize performance in a given React compon

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