Debounce vs Throttle: Best Practices
Best practices for using debounce and throttle in production.
Debounce vs Throttle: Best Practices
1. Choose the Right Technique
- Search, auto-save, validation -> debounce.
- Scroll, mousemove, resize -> throttle.
2. Use Appropriate Delays
- Debounce search: 300ms.
- Debounce auto-save: 1000ms.
- Throttle scroll: 100ms.
- Throttle mousemove: 50ms.
3. Preserve this and Arguments
return function (...args) { fn.apply(this, args); };
4. Add a Cancel Method
debounced.cancel = () => clearTimeout(timer);
5. Clean Up on Unmount
useEffect(() => { const handler = debounce(fn, 300); return () => handler.cancel(); }, []);
6. Consider lodash for Production
import { debounce, throttle } from "lodash";
lodash handles edge cases (this, args, cancel, leading/trailing) that simple implementations miss.
The Takeaway
Best practices: choose the right technique (debounce for bursty, throttle for continuous), use appropriate delays, preserve this/args, add cancel, clean up on unmount, and use lodash for production.
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.
100ms. This gives smooth feedback (10 updates per second) without overwhelming the browser. For mousemove, use 50ms. For rapid button clicks, use 500ms.
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.
Ready to master React completely?
Want to upskill yourself, crack your next interview, and get your dream job? Join our comprehensive course to dive deeper with high-quality video tutorials, solve interview questions, and a premium community.
Master React
Want to upskill yourself, crack your next interview, and get your dream job? Join our comprehensive course.