You've noticed that every time a parent component's state changes, a child component re-renders even though its props remain unchanged. How might you optimize the child component to prevent unnecessary re-renders?

  • Use React.memo
  • Use componentDidUpdate
  • Use shouldComponentUpdate
  • Use useEffect
You can optimize the child component by using React.memo. This higher-order component (HOC) can wrap your child component, preventing it from re-rendering when its props remain unchanged. componentDidUpdate and useEffect are used for side effects and don't address the issue of unnecessary re-renders. While shouldComponentUpdate can be used in class components, React.memo is the recommended way in functional components.
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