What is the difference between useMemo and useCallback in React?

What is the difference between useMemo and useCallback in React?

Both useMemo and useCallback are hooks in React that help optimize performance by memoizing values and functions. useMemo returns a memoized value, while useCallback returns a memoized function.

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

Sure! Use useMemo when you want to memoize a computed value, like a filtered list. Use useCallback when you want to memoize a function, such as an event handler that is passed to a child component.

Are there any performance implications of using them?

Yes, using them can prevent unnecessary re-renders, but overusing them can lead to performance overhead. It's best to use them when you have performance issues.

How do I know if I need to use them?

If you notice that your components are re-rendering too often and affecting performance, consider using useMemo or useCallback to optimize.