polymorphism example for golang

polymorphism.go

package main

import "fmt"

type Speaker interface {
	Speak() string
}

type cat struct {}
type dog struct {}
type person struct {
	name string
}

func (c cat) Speak() string {
	return "Meow..."
}

func (receiver dog) Speak() string {
	return "Woof..."
}

func (p person) Speak() string {
	return "Hi my name is " + p.name
}

func saySomethings(say ...Speaker)  {
	for _, s := range say {
		fmt.Println(s.Speak())
	}
}

func emptyDetails(s interface{}) {
	fmt.Printf("(%V, %T)\n", s, s)
}

func main() {
	c := cat{}
	d := dog{}
	p := person{"javad"}

	saySomethings(c,d,p)
	emptyDetails(p)
	emptyDetails(2)
}