Design Patterns in Go (Golang)

This book is a practical guide to applying classic design patterns (GoF) in modern Go (Golang). Unlike abstract descriptions in languages like Java or C++, each pattern here is analyzed with Go's specifics in mind: lack of inheritance, interfaces, goroutines, channels, and composition.

The book is structured on the "from simple to complex" principle and contains:

• Creational Patterns: Singleton, Factory Method, Abstract Factory, Builder, Prototype. You will learn how to create objects flexibly and without unnecessary code.
• Structural Patterns: Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy. Learn to build flexible and extensible hierarchies.
• Behavioral Patterns: Chain of Responsibility, Command, Iterator, Mediator, Memento, Observer, State, Strategy, Template Method, Visitor. Master effective interaction between objects.

Each pattern is accompanied by:

• A realistic example from web development, backend, or DevOps tools.
• Complete Go code with explanations.
• Class and interaction diagrams.
• Tips for avoiding antipatterns and common mistakes.

Who is this book for?

• Go developers who want to write clean, maintainable code.
• Programmers transitioning to Go from other languages and wanting to understand language idioms.
• Architects designing microservices and distributed systems in Go.

What you will learn:

• How to adapt classic patterns for multithreading and concurrency in Go.
• Why composition is often preferred over inheritance in Go, and how this affects patterns.
• How to use interfaces to create loosely coupled components.
• Real-world cases: from creating HTTP servers to implementing task queues.

The book is suitable both for beginners who have already mastered Go syntax and for experienced developers wanting to systematize their knowledge. All examples are tested on current versions of Go (1.21+) and are available for download.

Make your Go code predictable, testable, and scalable — with time-tested design patterns.