Golang Closures for decorator/middleware pattern

main.go

package main

import "fmt"

func Decorator(fn func(string)) func(string) {
	return func(s string) {
		fmt.Println("-----")
		fn(s)
		fmt.Println("-----")
	}
}

func Message(message string) func(string) {
	return func(s string) {
		fmt.Printf("%s, %s!\n", message, s)
	}
}

func Hello(something string) {
	fmt.Printf("Hello, %s!\n", something)
}

func HelloWorld() {
	fmt.Println("Hello, World!")
}

func main() {
	fmt.Println("Hello, World!")
	HelloWorld()
	Hello("Mars")
	Hello("Jupiter")

	AnotherHello := Message("Hello")
	Bye := Message("Bye")

	AnotherHello("Mars")
	Bye("Mars")
	Bye("Jupiter")

	DecoratedBye := Decorator(Bye)

	DecoratedBye("Jupiter")
}