JavaScript · Senior · Question 57 of 75

When is `requestIdleCallback` appropriate?

✓Correct answer: For low-priority work (analytics batching, prefetching) that can wait until the browser is idle
2For animations that must run every frame
3For handling user clicks

Explanation

The callback gets a deadline (timeRemaining()); do small chunks and reschedule. Pass timeout to guarantee it runs eventually on busy pages.

Further reading

MDN: requestIdleCallback() ↗

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