How does debounce work internally in JavaScript?
Each call to the debounced function clears the previous setTimeout timer and sets a new one. If the function is called again before the timer fires, the timer is reset. Only when the user stops calling for the delay period does the timer fire and the function execute.
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More FAQs in Autocomplete Debounce Implementation
function debounce(fn, delay) { let timer; return function(...args) { clearTimeout(timer); timer = setTimeout(() => fn.apply(this, args), delay); }; }. Each call clears the previous timer and sets a new one. Only the last call within the delay period executes.
Without debounce, every keystroke triggers an API call. Typing 'hello' makes 5 calls. With debounce (300ms), only 1 call is made after the user stops typing. This reduces server load, improves performance, and provides a better user experience.
300ms is a good default. It is fast enough to feel responsive and slow enough to skip intermediate keystrokes. Use 200ms for faster response or 500ms for slower. The exact value depends on the use case and API speed.
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