Low Level Design + MultiThreading Course - Observer Pattern Simplified 👀 | Real-World Examples + Best Practices 📚

Article - https://codewitharyan.com/system-design/low-level-design Structured DSA (Basics to Advanced) Practice - https://codewitharyan.com/cwa-sheet/practice-problems My Uber Interview Experience - https://youtu.be/VGYJIX5yl74 My Coinbase Interview Experience - https://youtu.be/IjOC18b_dCw My American Express Inteview Experience - https://youtu.be/c3UhYefhnqk My JP Morgan & Chase Interview Experience - https://youtu.be/-jacTpY57no ..... more coming soon (along with LLD course on Second Channel) Most Frequently asked questions based on Leetcode Premium - https://codewitharyan.com/cwa-sheet/aryan-dsa-master-sheet LLD Syllabus which we gonna cover - https://codewitharyan.com/system-design/low-level-design Let's Connect: Main Channel for DSA & Live Streams - https://www.youtube.com/@ARYANMITTAL X Twitter : https://x.com/aryan_mittal007 📱Discord (Join Community) : https://discord.gg/vwUAz2pEHZ 📝Linkedin (About me): https://www.linkedin.com/in/aryan-mittal-0077 📸 Instagram: https://www.instagram.com/codewitharyanbhai 📱Telegram : https://t.me/aryan_mittal_group 🤖 Github: https://github.com/aryan-0077 ✨ Timelines✨ 0:00 - Introduction: What will you learn? 0:26 - What is the Observer Pattern? 0:36 - Example: YouTube Notification System 1:00 - How do Observers get notified? 2:34 - Why Polling Approach is Inefficient? 2:50 - Problems with Manual Notification Handling 3:30 - Why Use Modular Notification Systems? 4:00 - How to Manage Subscriber Preferences 4:50 - How Open-Closed Principle is Violated 6:55 - Refactor with Observer Interface 7:00 - How to Handle Preferences Modally? 8:00 - Notifying Subscribers Based on Preferences 9:00 - Code Explanation 13:19 - Advantages: Decoupling & Flexibility 13:45 - Real-Life Use Cases: Notifications 14:17 - Conclusion: Scalable, Maintainable Design ✨ Hashtags ✨ #programming #Interviews #leetcode #faang #maang #datastructures #algorithms #low-level-design #lld-by-aryan