Why do you need to clear the timer in debounce?
To reset the delay on each call. Without clearing, each call would set a new timer, and all would fire. Clearing ensures only the last call's timer runs.
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More FAQs in Debounce Implementation: Step by Step
Use rest parameters: return function(...args) { clearTimeout(timer); timer = setTimeout(() => fn(...args), delay); }. Spread the args into the original function call.
Use apply: timer = setTimeout(() => fn.apply(this, args), delay). this inside the returned function is the caller's this. apply passes it to the original function.
Attach a cancel property to the returned function: debounced.cancel = () => clearTimeout(timer). Call debounced.cancel() to cancel the pending execution.
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