Go in Action, 2/e

Go in Action, Second Edition

Go in Action, Second Edition is a comprehensive, practical guide to modern Go programming (Golang), designed for developers who want to build clean, reliable, scalable, and high-performance software. Fully revised for today's Go ecosystem, this second edition covers modern language features, production-ready development practices, concurrency, software architecture, and the growing role of Go in AI-powered and agentic applications.

Coauthored by Joel Holmes, Andrew Walker, and William Kennedy, this edition brings together practical experience and deep knowledge of Go's design philosophy. Rather than simply teaching syntax, the book explains why Go works the way it does and how its design decisions help developers create safe, maintainable, and highly concurrent applications.

Master Modern Go Programming

The book provides hands-on coverage of the Go language and its modern development ecosystem, including:

• Go's unique type system and idiomatic programming techniques
• Go Generics and modern type-safe programming
• High-performance concurrency in Go
• Goroutines, channels, and concurrent application design
• Go Modules and multi-module workspaces
• Native Go fuzz testing
• Structured JSON processing
• Error handling and reliable application behavior
• Practical project organization and application structure
• Building production-grade Go applications

The examples focus on real-world development challenges, helping you understand how to use Go effectively beyond basic language tutorials.

Build Production-Grade Applications

Go in Action, Second Edition explores software engineering practices that help developers build applications that are easier to test, maintain, extend, and scale.

The book introduces architectural concepts including Domain-Driven Design (DDD) and Hexagonal Architecture, showing how these approaches can be applied to Go applications. You will learn how to create clear boundaries between business logic and external systems, resulting in scalable and decoupled software.

The Ports and Adapters pattern is particularly useful when building modern applications where external technologies can change rapidly. By separating core business logic from external services and APIs, developers can replace components without rewriting the application's fundamental logic.

Go for AI and LLM Applications

Modern software development increasingly combines traditional application engineering with artificial intelligence and large language models (LLMs). This edition explores how Go's architecture and performance characteristics can be applied to AI-powered applications.

The book explains how architectural boundaries can allow changing LLM models and APIs to be treated as interchangeable adapters. This approach enables applications to work with different commercial or local AI models while keeping core business logic independent of the underlying AI provider.

Two comprehensive appendices provide a practical AI engineering exercise covering:

• Building a high-performance vector search database
• Working with Qdrant
• Generating semantic embeddings
• Creating LLM-powered summarization pipelines
• Using Ollama
• Working with LangChain for Go
• Applying Go to modern AI application development

These examples make the book especially relevant to developers interested in combining Go, AI, LLMs, vector databases, embeddings, and agentic applications.

Learn Through Real-World Examples

Rather than focusing exclusively on simple programming exercises, Go in Action, Second Edition uses realistic examples to demonstrate how Go can be used to solve non-trivial software engineering problems.

Examples include applications such as command-line utilities, background workers, data processing, and concurrent systems. These projects help demonstrate how to write software that behaves predictably even when handling demanding workloads.

The result is a practical resource for developers who want to move from learning the Go language to using Go professionally in real-world software projects.

Who Should Read This Book?

Go in Action, Second Edition is suitable for:

• Software developers learning Go/Golang
• Developers transitioning to Go from another programming language
• Backend and server-side developers
• Developers building high-performance applications
• Engineers working with concurrent and distributed systems
• Developers interested in Go generics and modern Go features
• Software architects and technical leads
• Developers interested in Domain-Driven Design and Hexagonal Architecture
• Engineers developing AI-powered applications
• Developers working with LLMs, vector databases, embeddings, and AI agents
• Professionals who want to adopt Go for production software development

Why Choose Go in Action, Second Edition?

This fully updated edition brings together modern Go programming, concurrency, generics, application architecture, production development, and AI integration in a single practical resource.

Whether you are learning Go for the first time, updating your existing Go skills, or exploring how Go can be used to build modern AI-powered systems, this book provides practical guidance that connects language fundamentals with real-world software engineering.

Key Topics Covered

Go Programming • Golang • Go Generics • Go Modules • Go Concurrency • Goroutines • Channels • Error Handling • Fuzz Testing • JSON • Backend Development • Software Architecture • Domain-Driven Design • Hexagonal Architecture • Ports and Adapters • Distributed Systems • AI Applications • Large Language Models • LLMs • Vector Search • Qdrant • Semantic Embeddings • Ollama • LangChain • Agentic Applications

Book Title: Go in Action, Second EditionISBN: 9781633439702

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