Go Cheat Sheet

go-cheat-sheet.md

Go Cheat Sheet

Install Go on Mac

Following the instructions from https://golang.org/doc/install

1. Download https://golang.org/doc/install?download=go1.13.3.darwin-amd64.pkg
2. Run installer

if you don't set a $GOPATH, the default path is ~/go

Go Modules

Basic Commands

Remember to work outside of your $GOPATH!

• initialize a new module

  export GO111MODULE=on
  go mod init

  • this will create a go.mod file in your current directory.

• add a new dependency

  • in your .go file

    import rsc.io/quote

  • build your code

    go build

  • check your go.mod file, it will only show the rsc.io/quote module

  • check transitive dependencies with

    go list -m all

• list versions

  go list -m -versions rsc.io/sampler

• upgrade modules

  • check available update for all modules via

    go list -m -u all

  • update one specific package via (will update your dependency in go.mod)

    go get -u golang.org/x/text v0.3.0

  • upgrade all modules

    might not be a good idea though!

    go get -u

• downgrading

• use local changes

  # assume the local copy of your module is in ../quote
  go mod edit -replace 'rsc.io/quote=../quote'

• use remote fork / specific tag

  go mod edit -replace 'rsc.io/quote=github.com/myitcv/london-gophers-quote-fork@0.0.0-myfork'

• testing

  • all modules involved in your release (test all modules plus transitive dependencies)

    go test -short all

  • test a single module package

    go test rsc.io/quote/...

Convert an existing Project

Working outside of the $GOPATH

• Initialize Go modules inside the project directory

  go mod init
  go mod tidy

References for Go mdules

• Go Modules Documentation on GitHub
• https://www.youtube.com/watch?v=6MbIzJmLz6Q

Language Details

• Missing Generics in Go

Go Dependency Management

• Fetching Private Dependencies with Go Modules

Testing with Go

• Tests for Go CLI Applications
• Ginkgo
• GoMock

Learning Go

• Pacman with Go