Design Patterns in Go (Golang)

The book "Design Patterns in Go (Golang)" is a practical guide that will help you master the classic design patterns from the "Gang of Four" (GoF) book in the context of the modern Go language. The author, an experienced Go developer, adapts each pattern to the unique features of the language: goroutines, channels, interfaces, and composition.

Who is this book for?

• Junior and Middle Go developers — systematize your knowledge and learn to design flexible architectures.
• Backend engineers — improve code quality in microservices and web applications in Go.
• Developers transitioning from other languages — understand how to apply OOP patterns in Go without classical inheritance.
• Anyone who wants to write clean, testable, and extensible code — the book focuses on practical solutions.

What will you learn from the book?

• 23 classic GoF patterns (Creational, Structural, Behavioral) with examples in Go.
• How to apply SOLID and GRASP principles when designing in Go.
• Implementation of patterns using goroutines and channels (Fan-Out, Pipeline, Worker Pool).
• Common mistakes when implementing patterns and how to avoid them.
• Practical cases: handling HTTP requests, working with databases, caching, logging.
• Comparison of patterns with idiomatic solutions from the Go standard library.

Book structure

Each chapter is dedicated to one pattern and includes:

• Theoretical description and motivation.
• Class and interaction diagrams (in Go style).
• Step-by-step implementation in Go with explanations.
• Before/after examples of applying the pattern.
• Exercises for independent practice.

The book is written in a lively, accessible language and does not require deep knowledge of Go — basic syntax is enough. All code examples are tested on Go 1.21+ and are available in the repository. It is ideal both for self-study and for preparing for technical interviews.

After reading, you will be able to confidently design the architecture of Go applications, avoid anti-patterns, and make informed decisions about choosing the right pattern for a specific task. The book will become your desktop reference on design patterns in Go.