How do you clean up debounce/throttle in React?
Add a cancel method to the debounced/throttled function. In useEffect, return a cleanup that calls cancel: return () => debounced.cancel(). This clears the timer/interval when the component unmounts, preventing memory leaks.
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More FAQs in Debounce vs Throttle: Best Practices
Choose the right technique (debounce for bursty events, throttle for continuous), use appropriate delays (300ms search, 100ms scroll), preserve this and args (apply), add cancel method, clean up on unmount, and use lodash for production.
For production, use lodash. It handles edge cases (this, args, cancel, leading/trailing edges, max wait). For interviews, implement from scratch to show understanding. Use lodash in real code, implement in interviews.
300ms. It is fast enough to feel responsive and slow enough to skip intermediate keystrokes. For faster response use 200ms, for slower 500ms.
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