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Go in Action, Second Edition has been substantially rewritten for modern Go, fully updated with the language, tooling, and development practices Go programmers use today.

Completely updated for modern Go, with examples requiring Go 1.25 or later
An entirely new chapter on generics, including type parameters, constraints, generic functions and data structures
Error handling, including sentinel errors, custom error types, and error wrapping
Testing workflows including unit testing, TDD, benchmarking, profiling, and Go’s built-in fuzz testing.
Updated concurrency coverage built around a practical concurrent RSS reader
Modern structured logging with log/slog alongside Go’s standard library
Go modules and workspaces, replacing the GOPATH-era dependency-management material from the first edition and showing how to organize larger, multimodule Go projects
New production-oriented architecture examples, including interfaces, dependency inversion, domain-driven design, and hexagonal architecture
Two brand-new AI-focused appendices covering LLM-powered summarization and retrieval-augmented generation
New and rewritten examples throughout designed around real applications

About the reader

Professional developers proficient in at least one object-oriented language who want to build high-performance backend systems, cloud native applications, or AI-integrated pipelines.

About the author

Joel Holmes is a software developer building cloud native applications at EasyPost. Andy Walker is a Google Developer Expert in Go and Gophercon staff member. A coauthor of the first edition of Go in Action, William Kennedy is a founding member of GoBridge.