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Clean Architecture & Design Patterns in Practice · Lesson

Single Responsibility and Open-Closed Mastery

Deepen your command of the first two SOLID principles, learning to identify responsibility boundaries and extend behavior without modifying existing code.

Back to the Foundations

You have explored Dependency Inversion and Interface Segregation. This lesson masters the remaining pair:

  • Single Responsibility Principle (SRP)
  • Open-Closed Principle (OCP)

These two drive most everyday refactoring decisions.

SRP Defined Precisely

SRP says a class should have one reason to change. A reason to change maps to a single actor or stakeholder.

If billing rules and report formatting can change independently, they belong in different classes.

All lessons in this course

  1. Deep Dive into Dependency Inversion
  2. Interface Segregation in Practice
  3. Refactoring with Design Patterns
  4. Single Responsibility and Open-Closed Mastery
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