How do you test a debounce function in JavaScript?
Use jest.useFakeTimers() to control time. Call the debounced function multiple times, advance the timer by the delay, and verify only the last call's callback executed.
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function debounce(fn, delay) { let timer; return function(...args) { clearTimeout(timer); timer = setTimeout(() => fn.apply(this, args), delay); }; }
Debounce delays execution until activity stops (search input, only the last call runs). Throttle limits to once per interval (scroll handler, calls at most once per N ms).
Attach a cancel property: debounced.cancel = () => clearTimeout(timer). Call debounced.cancel() to cancel the pending execution.
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