Set up golang env

Let’s create golang application development environment and project

Goal

Set up golang environment, and create simple project

Env : Mac OS

Install golang and create structure

• Install golang
• Set GOPATH
• Create $HOME/go for Mac
• Create directory structure

Install golang

Go https://go.dev/ and download golang and install

Set GOPATH

For Mac, can add following to .zshrc file

```bash
export GOPATH=${HOME}/go
```

Add GOPATH under User directory/go (please create go directory under HOME)

Create directory structure

Create directory like this

GOPATH/
  src/
     github.com/
        username/
  pkg/
  bin/

This is expected github repository, if you use different repository, please use your repository url under src/ directory

src	Contains source code (organized by repository path)
pkg	Stores compiled package files
bin	Contains compiled binary executables

Create a project and initialization

As a next step, prepare a project

• Go GOPATH and project target directory under source codes
• Create a project directory
• Run go mod to initialize a project
• (Extra) Get dependency

Go GOPATH and project target directory under source codes

cd ${GOPATH}
cd src/github.com/<username>

Create a project directory

mkdir projectname
cd projectname

projectname is your project name, please use own name

Run go mod to initialize a project

Run following command

go mod init <module-path>

Module path is your module path

This is an example

go mod init github.com/<username>/<projectname>

Indicates project directory structure under GOPATH

(Extra) If you write codes (add import description), and want to update dependency

go get .