10 interview questions regarding ReactJS useMemo() Hook

10 interview questions regarding ReactJS useMemo() Hook

Here are 10 interview questions specifically focusing on the useMemo hook in React:

  1. What is the purpose of the useMemo hook in React?

  2. Explain the difference between useMemo and useEffect. When would you choose one over the other?

  3. How does useMemo optimize performance in a React application?

  4. Can you provide an example of a scenario where using useMemo would be beneficial?

  5. What are the dependencies in the dependency array of the useMemo hook, and why are they important?

  6. How does useMemo help in preventing unnecessary re-computation of values in functional components?

  7. What is memoization, and how is it related to the useMemo hook?

  8. Can you explain a situation where using useMemo might not be appropriate or effective?

  9. How do you use useMemo to memoize the result of a function in React?

  10. In what scenarios would you consider using both useMemo and React.memo together?


These questions cover various aspects of theuseMemo hook, including its purpose, performance optimization, dependency tracking, and practical use cases. They aim to assess the candidate's understanding of memoization and how it can be leveraged in React applications.