Go Fundamentals: Gopher Guides

1. Modules, Packages, and Dependencies

In this chapter, we begin our exploration of Go by looking at how it manages modules, packages, and dependencies. We first look at modules, which are a way to organize a set of packages for distribution under a specific version number for seamless dependency management. We then cover the concept of packages, which is the unit of code that can be imported into other packages. Finally, we look at importing packages from both the standard library and third-party packages.

Modules

A Go module¹ is a collection of Go packages² and their dependencies that can be built, versioned, and managed as a unit. An example of a Go module file layout can be found in Listing 1.1.

1. https://golang.org/ref/mod

2. https://golang.org/ref/spec#Import_declarations ...