Go (also known as Golang) is an open source programming language maintained by Google.

Installation

$ brew install golang

When installed, try to run go version to see the installed version of Go.

Setup your workspace

Add environment variables

Go has a unique approach of managing code where you have a single workspace for all your Go projects.

First, you’ll need to tell Go the location of your workspace. We’ll do this by adding some environment variables in your shell config file (usually .bash_profile, .bashrc or .zshrc).

export GOPATH=$HOME/go
export GOROOT=/usr/local/opt/go/libexec
export GOBIN=$GOPATH/bin
export PATH=$PATH:$GOPATH/bin
export PATH=$PATH:$GOROOT/bin

使修改立刻生效，run:

$ source .zshrc

查看下 go 的环境变量

$ go env

Create your workspace

Create the workspace directories tree:

$ mkdir -p $GOPATH $GOPATH/src $GOPATH/pkg $GOPATH/bin

$GOPATH/src This is where your Go projects are located $GOPATH/pkg A folder that contains every package objects $GOPATH/bin The compiled binaries home

Write your first program

Create a file in your $GOPATH/src, for example hello.go, and input the following code

package main
import "fmt"

func main() {
    fmt.Printf("hello, world\n")
}

Run the program by running:

$ go run hello.go

If you wish to compile it and move it to $GOPATH/bin, then run:

$ go install hello.go

Since we have $GOPATH/bin added to our $PATH, you can run your program from anywhere:

$ hello

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