Learning S.O.L.I.D. Programming Principles

Introduction

• Welcome
• What you should know
• Using the exercise files

1. Introduction to S.O.L.I.D. Programming

• What could go wrong?
• Explore a non-SOLID class
• Overview of the SOLID principles

2. Interface Segregation Principle

• Introduction to interface segregation
• Segregate the example classes
• ISP applied to example classes
• The wrap vs. extend decision
• Extend alternatives

3. Liskov Substitution Principle

• Introduction to Liskov substitution
• Interface variations
• Substitution applied to example classes
• Default values for parameters
• Avoiding isinstance()

4. The Open/Closed Design Principle

• Introduction to Open/Closed design
• Modify a class and fix bugs
• OCP via inheritance and composition
• More OCP extension techniques

5. Dependency Inversion Principle

• Introduction to dependency inversion
• Dependency injection and application configuration
• Testing consequences

6. Single Responsibility Principle

• Introduction to single responsibility
• High cohesion and indirection
• GRASP patterns

7. A Design Process

• CRC Cards
• Test-driven design

Conclusion

• Next steps