Refactoring Guru - Design Patterns
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Illustrated catalog of the 22 classic Gang of Four patterns, grouped as creational, structural, and behavioral. Each entry explains the problem, the solution structure with UML diagrams, applicability, pros and cons, and working code in several languages including Java, Python, and TypeScript.
More resources on Design Patterns
refactoring.guru
Refactoring.guru is a comprehensive learning hub for software engineers focused on design patterns and refactoring, offering clear explanations, code examples in multiple languages, and visual diagrams. It covers the Gang of Four design patterns, refactoring techniques, and practical guidance for writing clean, maintainable code.
Game Programming Patterns
Robert Nystrom's complete book, readable free online, revisits classic patterns such as Command, Observer, and State through game code, then adds game-specific ones like Game Loop, Component, and Object Pool, with C++ examples and frank discussion of each pattern's performance and design trade-offs.
Advanced Design Patterns
University of Alberta course taught by Kenny Wong covering creational, structural, and behavioural patterns in Java, plus design principles and code smells. Learners practise by identifying anti-patterns and refactoring an Android application in a capstone assignment.