React useEffect Cleanup Explained | Stop Memory Leaks & Optimize Your App
Learn how to use the *useEffect cleanup function in React* with a simple, practical example: updating the *page title* when a component mounts and automatically restoring it when the component unmounts.
This is a beginner-friendly tutorial that shows how `useEffect` cleanup works and why it’s important in React apps.
In this video, you’ll learn:
1. What a cleanup function in useEffect is
2. When it runs (before rerun & on component unmount)
3. How to apply it to update and reset the page title
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