go-say-hello repository: https://github.com/anggidast/go-say-hello

Go Modules is library or dependency management

To create a new module use command:

go mod init module-name

Go has great integration with Git, to release a module we only need to create Git Tag.

On this lesson, before create a new module we need to create a GitHub repository to store our released module

The module name is repository link

To create a new module use command:

go mod init github.com/anggidast/go-say-hello

After create a new module, Go will automatically create a new file: go.mod

Create a new file as a module,

sayHello.go

package go_say_hello

func SayHello() string { // Capitalize to set function as public
	return "Hello"
}

After create a module file, push it to GitHub

To release module version, create Git tag on created module

git tag v1.0.0
git push origin v1.0.0

The module will have releases tag

go-say-hello repository: https://github.com/anggidast/go-say-hello

We can add our released module to another module as dependency/library

go get module-name

Go will automatically download the dependency and add it to new module

Init new module and create a new main.go file as new module

add the dependecy with command above

after add dependecy, go mod file will listed the added dependency

Import dependency:

package main

import (
	"fmt"

	go_say_hello "github.com/anggidast/go-say-hello"
)

func main() {
	fmt.Println(go_say_hello.SayHello())
}

To upgrade module, add new Git tag to released module, and push it to GitHub

Change the version every update make

Manually upgrade:

• Change dependency version at go.mod

• Use command go get to download new version