React.js v19 Tutorials in Hindi - 2025 - #54: useEffect Cleanup Function in React JS. Very Important

In this video, you'll learn how to effectively use the useEffect cleanup function in React JS to manage side effects and ensure optimal performance in your applications. We'll walk you through creating an app to demonstrate the cleanup function, understanding the event loop with animations, and solving common issues with setInterval. By the end of this video, you'll have a clear understanding of how to implement cleanup functions to avoid memory leaks and other issues. Watch at least once, and believe me, you're going to love my JS course! 💸 Get All My YouTube Videos' Source Code for just ₹199! Grab Now - https://thapatechnical.shop/source-code 🧑‍💻 Access React Todo App Repo in GitHub: https://github.com/thapatechnical/thapa_technical_reactTodo.git 🔥 Access React Course Source Code, PPT & Notes here for Free : https://www.thapatechnical.com/2024/06/delete-elements-and-auto-update-tasks.html 📺 Discover React.js History in Just 10 Minutes - https://youtu.be/MiK2bFqhg1U 📺 Watch the complete Playlist here : https://www.youtube.com/playlist?list=PLwGdqUZWnOp1Rab71vx2zMF6qpwGDB2Z1 ------------------------------------------------------------------------ 🚀 Boost Your Skills with these Pre-Requisite Videos: 🔗 Best HTML Course - https://youtu.be/5ccq_nLHneE 🔗 Best CSS Course - https://youtu.be/MSICFljRcb4 🔗 JavaScript Basics Course Part 1 - https://youtu.be/13gLB6hDHR8 🔗 JavaScript Advanced Course Part 2 - https://youtu.be/YwsOCN8woA8 ------------------------------------------------------------------------ 💸 Build Your Own E-commerce Website for Free! - https://www.thapatechnical.com/2024/03/build-complete-ecommerce-website-using.html ------------------------------------------------------------------------ ✌️ Join Us! 🚀 Become a Member: Unlock perks, free source code, and more Join Now : https://www.youtube.com/channel/UCwfaAHy4zQUb2APNOGXUCCA/join 📷 Connect on Instagram: https://www.instagram.com/thapatechnical 🗨️ Join Our Discord Server: Hang out with fellow programmers Discord Link: https://discord.gg/MdScmCsua6 ------------------------------------------------------------------------ ⌛TIMELINE⏳ 0:00 What App We Will Create to Show Cleanup in useEffect 1:20 Folder Structure 1:32 How Not to Use setInterval in React 4:00 Event Loop Animation to Understand setInterval 6:10 Solve It Using useEffect - But Still Not Working 7:05 Let's Understand What's Exactly Happening in Our Code 9:35 Cleanup Function to Solve the Counter Issue 12:10 Must Watch Video for Cleanup Function