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.
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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.
300ms is a good default for search inputs. 200ms for faster response, 500ms for slower. Adjust based on the use case and API speed.
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