What is the leading edge in debounce?
When immediate=true, the function executes on the first call (leading edge) instead of waiting. Subsequent calls within the delay are debounced. Useful for buttons that should respond instantly but prevent double-clicks.
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More FAQs in Debounce Best Practices and Pitfalls
Use 300ms for search, clean up timers on unmount (cancel method), preserve this and arguments (apply + rest), use leading edge for buttons (immediate flag), and consider lodash for production.
No, use throttle for scroll. Debounce would delay execution until scrolling stops completely, which feels laggy. Throttle limits to once per interval, giving continuous feedback during scrolling.
Use useEffect cleanup: useEffect(() => { const debounced = debounce(fn, 300); return () => debounced.cancel(); }, []). This clears the timer when the component unmounts.
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