The classic Gang of Four book that introduced design patterns to software engineering. This foundational text catalogs 23 essential design patterns that have become the standard vocabulary for object-oriented design. Essential reading for any serious software engineer.

The foundational text that introduced design patterns to software engineering. This book, written by the Gang of Four (Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides), catalogs 23 essential design patterns that have become the standard vocabulary for object-oriented design. While the examples are in Smalltalk and C++, the patterns themselves are language-agnostic and apply to modern languages like Java, Python, JavaScript, and more. The book is organized into three categories: creational patterns (like Factory and Singleton), structural patterns (like Adapter and Decorator), and behavioral patterns (like Observer and Strategy). Each pattern includes a detailed explanation, motivation, structure, participants, collaborations, consequences, implementation, sample code, known uses, and related patterns. This book is essential reading for any serious software engineer who wants to understand how to design flexible, reusable, and maintainable software.

The classic Gang of Four book that introduced design patterns to software engineering. Catalogs 23 essential patterns for flexible object-oriented design.

Design Patterns: Reusable Object-Oriented Software Guide

Design Patterns: Elements of Reusable Object-Oriented Software

Hand-picked object-oriented design tools and resources we actually use in production. Each item tested by developers, for developers.

Object-Oriented Design Products

Design Patterns: Elements of Reusable Object-Oriented Software