SOLID Principles — a practical guide to SOLID principles OOP with clear examples you can reuse in real projects.
OOP Tutorial Series (46/65). Prefer one article? Read the complete OOP tutorial.
Short description
SOLID helps keep classes focused, extensible, and loosely coupled — especially important as projects grow.
SOLID map
S — Single Responsibility
O — Open/Closed
L — Liskov Substitution
I — Interface Segregation
D — Dependency Inversion