What are the best practices for using useCallback in React?

What are the best practices for using useCallback in React?

Using useCallback helps optimize performance by memoizing functions. Best practices include using it for functions that are passed as props to child components, especially if those components rely on reference equality to prevent unnecessary renders.

Can you give me an example of when to use it?

Sure! If you have a child component that receives a callback prop, you should wrap that callback in useCallback to prevent the child from re-rendering unless its dependencies change.

Are there any situations where I shouldn't use useCallback?

Yes, avoid using useCallback for functions that are not passed to child components or when the performance gain is negligible, as it can add unnecessary complexity.

What about useMemo? How does it relate to useCallback?

useMemo is used to memoize values, while useCallback is for memoizing functions. They both help optimize performance but serve different purposes.