What is the difference between useEffect and useLayoutEffect in React?
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.
Can you give an example of when to use each?
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.
What happens if I use useLayoutEffect for data fetching?
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.
Are there any performance implications to consider?
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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