useEffect Hook in React | Dependency Array, Cleanup Function & useEffect vs Lifecycle Methods

Are you confused about useEffect, the dependency array, or the cleanup function?
You’re not alone—useEffect is one of the most asked and most misunderstood React interview topics.

In this video, we explain useEffect clearly, deeply, and from an interview + internals perspective, so you understand not just how to use it, but why it works the way it does.

📌 In this video, you’ll learn:
✅ What is useEffect in React
✅ Why useEffect was introduced
✅ Dependency array explained (all cases)
✅ How React decides when an effect runs
✅ Cleanup function in useEffect (why & when)
✅ Preventing memory leaks
✅ useEffect vs class lifecycle methods
✅ Common useEffect mistakes
✅ Important React interview questions on useEffect

📌 This Episode 16 of the React Interview Preparation Series from Fullstack Diaries, focused on React fundamentals, internals, and interview‑ready explanations.

👨‍💻 Whether you’re a React beginner, frontend developer, or preparing for React interviews, this video will strengthen your core understanding.

💬 Let’s Connect
🔔 Subscribe for weekly React & frontend interview prep videos
👍 Like & share to support the series
💬 Comment: Which useEffect case confuses you the most?

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Видео useEffect Hook in React | Dependency Array, Cleanup Function & useEffect vs Lifecycle Methods канала Fullstack Diaries