Summary
We have covered the 4+1 architecture view model, as well as system quality attributes, separation of concerns, cohesiveness, coupling, the SOLID principles, and the Law of Demeter. We have demonstrated them with code examples. These demonstrated that adhering to these principles lets the code become modular, flexible, maintainable, extensible, and easy to understand.
We have also discussed the conflicting concepts of the YAGNI principle and future-proof architecture. We clarified what future-proofing is and how it is different from capacity planning.
In the next chapter, we will explore polymorphism and its alternative approaches.
