Single Responsibility Principle with complete code example | Low level design playlist | SOLID
For this video on SOLID principles, specifically focusing on the Single Responsibility Principle, here is a professional description and a list of chapters you can use:
Video Description
In this second video of our Low-Level Design (LLD) series, we explore the SOLID Principles, starting with the Single Responsibility Principle (SRP). Writing clean, maintainable, and scalable code is a critical skill for any software engineer, especially when preparing for technical interviews.
This tutorial breaks down the core definition of SRP: that a class should have one specific, well-defined job and only one reason to change. We move beyond theory by analyzing a practical coding example of an "Invoice Service" that violates SRP and then refactor it step-by-step into modular, focused classes.
Key takeaways include:
How to identify if a class is doing too much.
The "Single Reason to Change" rule as a check for SRP.
Refactoring a monolithic class into specialized components (Calculators, Renderers, and Senders).
How SRP improves code maintainability and scalability.
Whether you're a beginner or looking to sharpen your LLD skills for interviews, this guide will help you understand how to apply the first letter of SOLID in your daily development.
Video Chapters
0:00 - Introduction to SOLID Principles
0:45 - The Five SOLID Principles Defined (S-O-L-I-D)
1:56 - Deep Dive into Single Responsibility Principle (SRP)
3:22 - Identifying the "Single Reason to Change"
4:57 - Practical Code Example: Violating SRP in an Invoice Service
6:03 - Why the Original Code is Hard to Maintain
8:25 - Step 1: Refactoring the Amount Calculator
11:38 - Step 2: Extracting the Template Renderer
15:22 - Step 3: Moving Email Logic to a Dedicated Sender
17:15 - Final Review: Comparing SRP vs. Non-SRP Code
18:00 - Conclusion and Next Steps
Watch the full video here: • Single Responsibility Principle with compl...
Github link for the code - https://github.com/tenxbackend/oops-p...