What are useMemo and useCallback in React?

Can you explain what useMemo and useCallback are in React?

Sure! useMemo is a hook that memoizes a value, preventing unnecessary recalculations on re-renders. useCallback is similar but memoizes a function.

When should I use useMemo over useCallback?

You should use useMemo when you want to optimize expensive calculations, while useCallback is best for memoizing functions to prevent re-creation.

Can you give me an example of how to use them?

Absolutely! For useMemo, you might use it to calculate a derived state based on props. For useCallback, you can wrap a function that handles an event to avoid re-creating it on every render.

Are there any performance drawbacks to using them?

Yes, overusing them can lead to unnecessary complexity and might actually hurt performance if the memoization cost outweighs the benefits.