What is the difference between useEffect and componentDidUpdate?

What is the difference between useEffect and componentDidUpdate?

Both are used for side effects in React, but useEffect is a hook that runs after every render, while componentDidUpdate is a lifecycle method that runs after updates in class components.

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

Sure! Use useEffect for fetching data in functional components, and componentDidUpdate for updating the DOM in class components.

Are there any performance considerations I should be aware of?

Yes, useEffect can lead to performance issues if not managed properly, especially with dependencies. Always specify dependencies to avoid unnecessary re-renders.

What about cleanup in useEffect?

Good question! useEffect can return a cleanup function to clean up resources, while componentDidUpdate doesn't have a built-in cleanup mechanism.