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architecture (2)

Design Patterns — Gang-of-Four Essentials and Modern Variants

A practical reference for classic OOP design patterns — Strategy, Observer, Factory, Adapter, Decorator, Repository — with examples in Python, TypeScript, and Go.
design-patterns oop architecture gof refactoring principles

SOLID — Five Principles for Maintainable OO Design

A modern walk-through of the SOLID principles — single responsibility, open-closed, Liskov, interface segregation, dependency inversion — with anti-examples and refactors in TypeScript and Python.
solid oop principles srp ocp lsp isp dip refactoring architecture