What are the best practices for using useMemo in React?

What are the best practices for using useMemo in React?

Using useMemo can optimize performance by memoizing expensive calculations. Best practices include using it for expensive computations and ensuring dependencies are correctly set.

Can you give an example of when to use useMemo?

Sure! If you have a component that performs a heavy calculation based on props, you can wrap that calculation in useMemo to avoid recalculating it on every render.

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

Yes, avoid using useMemo for simple calculations or when the performance gain is negligible, as it can add unnecessary complexity.

How does useMemo compare to useCallback?

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

What are common mistakes to avoid with useMemo?

Common mistakes include not specifying dependencies correctly, overusing it for trivial calculations, and misunderstanding its purpose.