Question 1

Why do you need to clear the timer in debounce?

Accepted Answer

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.

Question 2

How do you implement debounce with arguments in JavaScript?

Accepted Answer

Use rest parameters: return function(...args) { clearTimeout(timer); timer = setTimeout(() => fn(...args), delay); }. Spread the args into the original function call.

Question 3

How do you preserve this in a debounce function?

Accepted Answer

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.

Question 4

How do you add a cancel method to a debounce function?

Accepted Answer

Attach a cancel property to the returned function: debounced.cancel = () => clearTimeout(timer). Call debounced.cancel() to cancel the pending execution.

Why do you need to clear the timer in debounce?

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