Does debouncing use closures in JavaScript?
Yes. The timer variable is in the outer function's scope. The returned function closes over it. Each call clears and resets the same timer via the closure.
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More FAQs in What Is Debouncing in JavaScript?
A technique that delays function execution until the user stops calling it for a specified delay. Each call clears the previous timer and sets a new one. Only the last call executes.
function debounce(fn, delay) { let timer; return function(...args) { clearTimeout(timer); timer = setTimeout(() => fn.apply(this, args), delay); }; }
To avoid making an API call on every keystroke. Without debounce, typing 'hello' makes 5 calls. With debounce (300ms), only 1 call is made after the user stops typing.
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