React.js Topics for a Mid-Senior Level Developer Interview Preparation

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React.js Topics for a Mid-Senior Level Developer Interview Preparation

1. Core Concepts

  • React Component Types (Class vs Functional Components)✅
  • JSX and Rendering Elements✅
  • Props and Prop Validation✅
  • State Management (useState, class-based state)✅
  • Lifecycle Methods vs Hooks (useEffect)✅

2. Advanced React

  • Context API✅
  • Higher-Order Components (HOC)✅
  • Render Props✅
  • React Portals✅
  • Refs (createRef✅, useRef✅, forwardRef✅)
  • Error Boundaries✅
  • Suspense and Lazy Loading✅
  • Strict Mode✅
  • Concurrent Rendering✅

3. React Hooks

  • Basic Hooks: useState, useEffect✅
  • Advanced Hooks: useContext✅, useReducer✅, useMemo✅, useCallback✅, useRef✅, useLayoutEffect✅
  • Custom Hooks (Creation and Use Cases)✅

4. React Performance

  • React.memo and useMemo✅
  • React Profiler
  • Avoiding Re-renders (key, memoization, and immutability)✅
  • Code Splitting and Lazy Loading✅
  • Virtual DOM and Reconciliation✅

5. Routing

  • React Router (v6+):
    • Route Configurations✅
    • Nested Routing✅
    • Dynamic Routing✅
    • Programmatic Navigation (useNavigate, useParams)✅
    • Protected Routes✅
    • Lazy Loading Routes✅

6. State Management

  • React's Built-in State Management (useState, useReducer, Context API)✅
  • Third-Party State Libraries:
    • Redux Toolkit
    • Zustand✅
  • Comparing Global and Local State Management✅

7. Forms and Validation

  • Controlled vs Uncontrolled Components✅
  • Form Libraries (Formik, React Hook Form✅)
  • Custom Form Validations✅
  • File Upload Handling

8. Styling in React

  • Inline Styles✅
  • CSS Modules✅
  • Styled-Components✅
  • Emotion
  • Tailwind CSS Integration✅

9. Testing

  • Unit Testing with Jest and React Testing Library
  • Component Testing (Shallow vs Deep)
  • Mocking API Calls
  • Snapshot Testing
  • End-to-End Testing with Cypress or Playwright

10. React and APIs

  • Fetching Data (REST✅ and GraphQL)
  • Axios vs Fetch✅
  • Handling Asynchronous Data✅
  • Error Handling and Loading States✅
  • WebSockets in React
  • React Query (for Server State Management)

11. Ecosystem and Tools

  • TypeScript with React
  • ESLint and Prettier
  • Storybook for Component Development
  • State Management DevTools✅
  • Babel and Webpack Basics (specific to React)

12. Real-World Features

  • Authentication and Authorization
  • Role-Based Access Control (RBAC)
  • Optimized Lists with Virtualization (react-window, react-virtualized)
  • Accessibility (ARIA Roles, Keyboard Navigation)
  • Internationalization (i18n libraries)

13. Deployment

  • Build and Production Configurations
  • Code Splitting and Tree Shaking
  • Deployment Platforms (Vercel, Netlify, AWS, Docker)
  • CI/CD Integration for React Apps

14. React Ecosystem Libraries

  • Material-UI (MUI)✅, Ant Design, or other UI Libraries
  • Chart Libraries (e.g., recharts, chart.js)
  • Drag-and-Drop Libraries (e.g., react-dnd, react-beautiful-dnd)

15. Miscellaneous

  • React Fiber Architecture✅
  • React's Event Handling System✅
  • Differences Between React and Other Frameworks (Vue, Angular)✅
  • Upgrading React Versions and Handling Breaking Changes✅

16. Emerging Concepts

  • Server Components✅
  • React Native Basics (Optional)
  • Edge Rendering (React with frameworks like Next.js)

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