How can you prevent a functional component from re-rendering when its parent re-renders, even if its props haven't changed?

  • Use the React.memo higher-order component.
  • Use shouldComponentUpdate in a class component.
  • Use PureComponent in a class component.
  • Use useMemo hook with functional components.
To prevent a functional component from re-rendering when its parent re-renders, even if its props haven't changed, you can use the React.memo higher-order component (HOC). This HOC memoizes the component, and it will only re-render if its props have changed. Options 2 and 3 are methods applicable to class components, and option 4 is a hook for memoizing values, not components.
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