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What is the difference between useEffect and useLayoutEffect in React?

An example of an AI chatbot conversation about the differences between useEffect and useLayoutEffect in React.

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You

What is the difference between useEffect and useLayoutEffect in React?

MagicBuddy
MagicBuddy

The main difference is when they are executed. useEffect runs after the DOM has been painted, while useLayoutEffect runs synchronously after all DOM mutations but before the browser has a chance to paint.

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You

Can you give an example of when to use each?

MagicBuddy
MagicBuddy

Sure! Use useEffect for data fetching or subscriptions, where you don't need to block the browser from painting. Use useLayoutEffect for measurements or DOM manipulations that need to happen before the browser paints.

😀
You

What happens if I use useLayoutEffect for data fetching?

MagicBuddy
MagicBuddy

Using useLayoutEffect for data fetching can lead to performance issues, as it blocks the browser from painting until the effect is resolved, potentially causing a janky user experience.

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You

Are there any performance implications to consider?

MagicBuddy
MagicBuddy

Yes, using useLayoutEffect can lead to performance bottlenecks if overused, as it can delay rendering. It's best to use it only when necessary.

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