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What is useEffect in React?

An example of an AI chatbot conversation about the useEffect hook in React.

😀
You

Can you explain what useEffect does in React?

MagicBuddy
MagicBuddy

Sure! useEffect is a hook that lets you perform side effects in function components. It runs after the render and can be used for data fetching, subscriptions, or manually changing the DOM.

😀
You

How does it differ from componentDidMount?

MagicBuddy
MagicBuddy

Great question! useEffect can mimic componentDidMount, componentDidUpdate, and componentWillUnmount, depending on how you use its dependency array.

😀
You

What is the dependency array?

MagicBuddy
MagicBuddy

The dependency array is the second argument you pass to useEffect. It tells React when to re-run the effect. If you pass an empty array, it runs only once after the initial render.

😀
You

Can you give me an example of useEffect in action?

MagicBuddy
MagicBuddy

Absolutely! Here's a simple example:

useEffect(() => {
  fetchData(); // Fetch data when the component mounts
}, []);
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