Using Go interfaces for Duck typing like features

sound.go

// Simple Duck Typing in Go 

package main

import "fmt"

type Animal interface {
        sound() string
	getName() string
}

type Dog struct {
	name string
}

func (d *Dog) sound() string {
	return "Woof!"
}

func (d *Dog) getName() string {
	return d.name
}

type Duck struct {
	name string
}

func (d *Duck) sound() string {
	return "Quack!"
}

func (d *Duck) getName() string {
	return d.name
}

func makeSound(a Animal) string {
	return a.getName() + " makes this sound : " + a.sound()
}

func main() {
	var dog *Dog = new(Dog)
	var duck *Duck = new(Duck)

	dog.name = "Brewster"
	duck.name = "Donald"

	fmt.Println(makeSound(dog))   // Dog implements Animal interface 
	fmt.Println(makeSound(duck))  // Duck implements Animal interface
}