React Cleanup Function EXPLAINED 🚀 Fix Memory Leaks & Errors

Published: 05 February 2026
on channel: Why It Works

Most React devs have seen the cleanup function…but have no idea what actually happens when you don’t use it.
In this video, we break down React cleanup functions in a fast, no-fluff way:
What the cleanup function actually does
Why missing it causes memory leaks
How it leads to errors and warnings
If you’ve ever seen errors like "Can’t perform a React state update on an unmounted component",
This video explains exactly why 💥

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