Create a Go Module

create a folder for the Go module, as below

mkdir mymodule
cd mymodule

Issue the Create Module command in terminal as following, here "github.com/freedomtutorials/mymodule" is the name of the module which we are going to create, you can replace with your module name

go mod init github.com/freedomtutorials/mymodule

the file go.mod will be created and the below output will be produced

$ go mod init github.com/freedomtutorials/mymodule
go: creating new go.mod: module github.com/freedomtutorials/mymodule

In Go, if a function name starts with a capital letter will be available to be called by a function from same package or other package. This is known in Go as an exported name.

create a file mymodule.go in the current folder, and open in text editor paste the following code into mymodule.go and save the file

package mymodule

import "fmt"

func MyFunc(name string) string {
    message := fmt.Sprintf("Hello, %v. Welcome!", name)
    return message
}