Learning GO!

All my GO tutorials

Setup

asdf package manager install

Install the latest version of Go with the asdf version manager:

$ cd
$ git clone https://github.com/asdf-vm/asdf.git ~/.asdf
$ cd ~/.asdf
$ git checkout "$(git describe --abbrev=0 --tags)"

# For Ubuntu or other linux distros
$ echo '. $HOME/.asdf/asdf.sh' >> ~/.bashrc
$ echo '. $HOME/.asdf/completions/asdf.bash' >> ~/.bashrc
$ source ~/.bashrc

$ asdf plugin-add golang https://github.com/kennyp/asdf-golang.git
$ asdf install golang latest
$ asdf list
$ asdf global golang 1.17.1
$ asdf current
$ go help

• https://github.com/asdf-vm/asdf
• https://github.com/kennyp/asdf-golang

VSCode

Install the official Golang extension:

• https://marketplace.visualstudio.com/items?itemName=golang.go
• https://github.com/golang/vscode-go/blob/master/README.md

Changing default$GOPATH

$ echo "export GOPATH=$HOME/code/go" >> ~/.bashrc
$ source ~/.bashrc

$ go env -w GOPATH=$HOME/code/go

• https://github.com/golang/go/wiki/SettingGOPATH

Using external packages

$ go mod init
$ go get github.com/fatih/color
$ asdf reshim golang

Web Sockets Chat

Go the project's folder and execute all go files:

$ cd web_sockets_chat
$ go run ./*.go

Then open one of the demos in your web browser:

• Ping demo: http://localhost:7000/static/ping_demo.html
• Echo demo: http://localhost:7000/static/echo_demo.html
• Broadcast demo: http://localhost:7000/static/broadcast_demo.html

Notes

If it starts with an upper case it's public, else it's private. Genius!

Methods are implemented with a reciever declaration:

// Method copies reciever
func (receiver struct_type) Method(arg int) {
	receiver.value *= arg
}

// Method manipulates a pointer receiver
func (receiver *struct_type) Method(arg int) {
	receiver.value *= arg
}

Docs

• https://golang.org/doc/articles/wiki/
• https://golang.org/pkg/
• https://golang.org/pkg/net/http/

Libs

• https://github.com/fatih/color
• https://golangdocs.com/concatenate-strings-in-golang
• https://golangdocs.com/benchmark-functions-in-golang
• https://golangdocs.com/for-loop-in-golang

Resources

• https://blog.golang.org/maps
• https://go101.org/article/type-system-overview.html
• http://www.golangpatterns.info/object-oriented/constructors
• https://stackoverflow.com/questions/13137463/declare-a-constant-array
• https://appdividend.com/2019/05/16/golang-constants-tutorial-with-example-constants-in-go/
• https://www.shellhacks.com/bash-colors/
• https://www.tutorialspoint.com/go/go_continue_statement.htm
• https://progolang.com/how-to-write-benchmarks-in-go/
• https://golangbot.com/goroutines/
• https://golangbyexample.com/typed-untyped-constant-golang/
• https://golangbyexample.com/for-loop-in-golang/