method_type.go

package main

import "fmt"

type Person struct {
	Name string
}

func (p Person) Greeting() string {
	return fmt.Sprintf("Hello, %v!", p.Name)
}

type Echoable func() string

func Echo(f Echoable) {
	fmt.Println(f())
}

func main() {
	p := Person{"Satoryu"}

	var f Echoable
	f = p.Greeting
	Echo(f)
}