Example of using interfaces in Go

interface.go

package main

import (
	"log"
)

type Notifier interface {
	Notify() error
}
//our User struct
type User struct {
	Name string
	Email string
}
//basic Handler
func SendNotification(notify Notifier) error {
	 return notify.Notify()
}
// define our user method to notify us
func (u *User) Notify() error {
	log.Printf("User: Sengind User, Mail to %s<%s>\n",
				u.Name,
				u.Email)
	return nil
}


func main() {
	user:= &User {
		Name: "Alber Jones",
		Email: "albJones@email.com",
	}

	SendNotification(user)
}