How deeply does Go in Practice, Second Edition cover go.mod file?

Explains how to create and maintain the file, but does not show its literal syntax or dependency entries.

Go.mod file

As explained in Go in Practice, Second Edition

A go.mod file declares a Go module's module path, target Go version, and required dependencies.

A go.mod file holds a Go module’s identity and configuration: its module path, target Go version, and any declared third-party dependencies. Create it at the top level of a new project before adding application code. section 1.2.4 section 1.5

Initialize a project

From the project directory, run `go mod init hellogo`. This creates go.mod; you can then add main.go in the same directory. If you plan to share the project, use a unique module path, commonly a repository URL path such as `github.com/[USERNAME]/[REPO]`, instead of `hellogo`. section 1.5

Third-party dependencies added with `go get` appear in go.mod. After manually changing the target version or removing dependencies, run `go mod tidy` to clean up the dependency tree and file. section 1.2.4

How Go in Practice, Second Edition covers it

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Also explained in

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Go in Action, Second EditionA go.mod file is a Go module definition file that records the module path, Go language version, and module dependencies.
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Learn Go with Pocket-Sized Projectsgo.mod is a Go module definition file that declares a module's path and dependency requirements.

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Related concepts

go mod initproduced by · go mod init is a Go command that initializes a module by creating its go.mod file with a specified module path.
go moduleconfigures · A Go module is a versioned collection of related Go packages defined by a go.mod file and managed as a unit for dependency resolution and builds.
go commandconfigures · The go command is Go’s standard command-line interface for compiling, building, testing, formatting, analyzing, and managing Go programs and dependencies.
go mod tidyproduced by · go mod tidy is a Go command that synchronizes declared module dependencies and checksums with the packages imported by the source code.

This explainer was generated by Manning's knowledge graph from the text of Go in Practice, Second Edition. The section links point to the parts of the book it draws on.