What is the useEffect hook in React?

Can you explain what the useEffect hook does in React?

Sure! The useEffect hook lets you perform side effects in function components, like fetching data or directly interacting with the DOM.

How do I use useEffect to fetch data from an API?

You can use useEffect to call your API inside it. For example:

useEffect(() => {
  fetch('https://api.example.com/data')
    .then(response => response.json())
    .then(data => setData(data));
}, []);

This will fetch data when the component mounts.

What does the empty array [] mean in the useEffect hook?

The empty array means that the effect runs only once when the component mounts, similar to componentDidMount in class components.

Can I use multiple useEffect hooks in a single component?

Yes, you can use multiple useEffect hooks in a single component to handle different side effects separately.