Difference between useEffect hook and useLayoutEffect.

The main difference between useEffect hook and useLayoutEffect hook is in the timing of their invocation. useEffect hook is invoked after the DOM is painted. useLayoutEffect hook on the other hand is invoked synchronously before changes are painted on the screen.

Use useLayoutEffect hook instead of useEffect hook if your effect will mutate the DOM. useEffect hook is called after the screen is painted. Therefore mutating the DOM again immediately after the screen has been painted, will cause a flickering effect if the mutation is visible to the client.

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