Скачать или смотреть ⚛️ React useEffect – Master Cleanup Functions & Dependency Arrays Like a Pro!

In this lesson from the React Mastery Series, we deep dive into one of the most misunderstood parts of React: cleanup functions and the dependency array in the useEffect Hook.

You’ll learn exactly how React handles effects, when and why to use cleanup logic (especially for timers, subscriptions, or event listeners), and how to avoid infinite loops and stale data using dependency arrays correctly.

💡 What You’ll Learn:

🔄 How useEffect cleanup functions work
🧹 When cleanup is called (on unmount & before next effect run)
🛠️ Cleaning up intervals, event listeners, and subscriptions
📦 Understanding the dependency array ([], [value], no array)
💥 Common bugs from incorrect dependencies (and how to fix them)
🎯 How to avoid infinite re-renders and stale closures
✅ Best practices for managing clean and predictable side effects
🧠 How React optimizes effect execution behind the scenes

📂 Source Code + Notes:
👉 https://github.com/coding4dev/react-c...

📺 Watch the Full React Mastery Playlist:
👉    • React.js Mastery: Beginner to Advanced Ful...  

🧠 Dependency Array Tips:

✔️ [] → Run once on mount
✔️ [var] → Run on mount + whenever var changes
✔️ Omit array → Run on every render (⚠️ rarely needed!)
✔️ Always include everything you use inside useEffect

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