methodsets.go

// A type may have a method set associated with it. The method set of an interface type is its interface. 
// type T
// The method set of any other type T consists of all methods declared with receiver type T. 

package main

import (
	"fmt"
)

type Person struct {
	first string
}

type secretAgent struct {
	Person
	ltk bool
}

func (p Person) speak() {
	fmt.Println("from person", p.first)
}

func (sa secretAgent) speak() {
	fmt.Println("from secret agent", sa.first)
}

type human interface {
	speak()
}

func saySomething(h human) {
	h.speak()
}

func main() {

	p1 := Person{
		first: "Jorgen",
	}

	sa1 := secretAgent{
		Person: Person{
			first: "Ula Britta Frita Smirta",
		},
		ltk: true,
	}

	saySomething(p1)
	saySomething(sa1)
}