SMRTR ProgrammingAug 31, 2026Dev.to

Debounce and Throttle in JavaScript: The Complete Guide

SMRTR summary

Debounce and throttle solve a common but costly problem: event handlers firing far more often than needed. This guide walks through building both from scratch, covering leading/trailing edge behavior, cancel/flush support, and React-specific pitfalls like stale closures and missing cleanup. Knowing when to use each — not just how to write them — is what separates a working implementation from a production-ready one.

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