Singleton Design Pattern | Thread-Safe, Lazy & Eager Initialization + Real Use Cases

Welcome to Lecture 10 of the Ultimate Low-Level Design (LLD) Series by Coder Army!

Second week for #lowleveldesign #systemdesign #8weeksLLdchallenge.

We are doing 8 weeks challenge and going to complete the whole course within the duration with quality content on Youtube. Let’s learn LLD like never before and attain advance level mastery on this subject.

Master the Singleton Design Pattern* — one of the most commonly asked concepts in system design interviews and source of confusion for many developers!

In this video, we’ll cover:

What is Singleton Design Pattern?
How to implement it in C++ (Step-by-Step)
Lazy vs Eager Initialization
Thread-Safe Singleton: The right way!
Real-world use cases of Singleton
Common pitfalls & bottlenecks you MUST avoid

By the end of this video, you’ll not only understand Singleton in depth, but you’ll also know when to use it, and when not to.


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00:00 Introduction
01:39 Understanding Object Creation logic
06:58 Creating Singleton class from scratch
16:56 Making class Thread Safe
21:09 Introducing double Locking
24:10 Eager Initialization
26:44 Conclusion
27:09 Practical use-case
31:00 Where not to use Singleton

#SingletonPattern #SystemDesign #LLD #JavaSingleton #ThreadSafeSingleton #DesignPatternsExplained #SoftwareEngineering #CodingInterviewPrep #LowLevelDesign #TechInterviewTips #ObjectOrientedDesign #OOPS #8weekslldchallenge.