What React interview questions would you shoot as a lead developer?

These questions cover various aspects of React development and provide insight into the candidate's knowledge, experience, and problem-solving abilities. Depending on the specific requirements of the role and the project, you may tailor the questions accordingly.

As a lead developer conducting a React interview, you would likely ask a range of questions to assess the candidate's understanding of React concepts, problem-solving skills, and familiarity with best practices. Here are some React interview questions you might consider:

  1. Fundamental Concepts:

    • What is React, and how does it differ from other JavaScript frameworks?
    • Explain the virtual DOM and its significance in React.
    • What are the key features of React?
    • How does JSX contribute to React development?
  2. Component-Based Architecture:

    • Describe the component-based architecture in React.
    • What are functional components, and when would you use them over class components?
    • How do you pass data between components in React?
  3. State and Props:

    • What is state in React, and how is it different from props?
    • Explain the significance of lifting state up in React applications.
    • How do you manage state in React? Discuss different approaches.
  4. Lifecycle Methods:

    • What are React lifecycle methods, and how do they work?
    • Can you describe the lifecycle of a React component?
    • When would you use componentDidMount() and componentDidUpdate() lifecycle methods?
  5. Handling Events:

    • How do you handle events in React?
    • What is event delegation, and how does React utilize it?
    • Explain the differences between synthetic events and native events in React.
  6. State Management:

    • Discuss various state management solutions in React (e.g., Context API, Redux).
    • When would you choose Redux over the Context API for state management?
  7. Routing and Navigation:

    • How do you implement routing in React applications?
    • Can you explain the purpose of React Router and its key components?
    • How do you handle dynamic routing and nested routes in React Router?
  8. Performance Optimization:

    • What strategies would you employ to optimize the performance of a React application?
    • Discuss code-splitting and its benefits in React applications.
    • How do you prevent unnecessary re-renders in React components?
  9. Testing and Debugging:

    • What tools and libraries do you use for testing React applications?
    • Describe the difference between unit testing and integration testing in React.
    • How would you debug a React application?
  10. Best Practices and Patterns:

    • Discuss common React best practices and coding conventions.
    • Can you explain the differences between controlled and uncontrolled components?
    • How would you structure a large-scale React application for maintainability and scalability?