What is the difference between useEffect and componentDidMount?

What is the difference between useEffect and componentDidMount in React?

useEffect is a Hook that runs after every render, while componentDidMount is a lifecycle method that runs once after the component mounts.

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

Sure! Here's a simple example:

useEffect(() => {
  // Your code here
}, []); // Empty dependency array means it runs once after mount

When should I use useEffect instead of componentDidMount?

Use useEffect when you need to handle side effects in functional components, especially when you want to respond to state or prop changes.

Are there any performance implications of using useEffect?

Yes, if not managed properly, useEffect can lead to performance issues, especially if it runs on every render. Always specify dependencies.