README

Study notes for Udemy course Go: The Complete Developer's Guide (Golang).

Commands

go mod init [module-path]

declare a Go module module-path is the global unique identifier, case sensitive

go mod edit -module [module-path]

rename a module

gonew github.com/Magicbeanbuyer/learning-golang/module_template github.com/Magicbeanbuyer/learning-golang/<NAME>

create a new module from template.

go list -m -versions github.com/shopspring/decimal

list versions of a module

go install <REPO_URL>@<VERSION>

download packages to GOPATH/PKG/mod, a.k.a GOMODCACHE compile source code into an executable and install it to GOPATH/bin

go get <REPO_URL>@<VERSION>

install packages to ~/go/pkg/mod a.k.a GOMODCACHE add modules to go.mod & go.sum

go mod tidy remove unimported modules from go.mod & go.sum

go clean -modcache

remove dir ~/go/pkg/mod a.k.a GOMODCACHE

Concepts

Module declared with go.mod has a global unique identifier everything inside a module are version together

Package

a folder (and subfolders) of .go files one package per directory package and dir don't have to have the same name, import dir name, and call by package name https://golangbyexample.com/package-folder-name-golang/ A package's exported constants, variables and functions all start with an uppercase letter in their name

Envs

GOPATH

third party tools path go install installs modules to GOPATH/bin exported via .zshrc

GOROOT

path of Go development environment no need to export explicitly anymore