Composition sample in Go

main.go

package main

import (
	"fmt"
)

type User struct {
	Name string
	Age  int
}

func (u *User) ShowName() {
	fmt.Println(u.Name)
}

type MyUser struct {
	User
	Score int
}

func (u *MyUser) ShowScore() {
	fmt.Println(u.Name, u.Score)
}

func main() {
	a := User{Name: "test"}
	a.ShowName()

	b := MyUser{User: a, Score: 10}
	b.ShowScore()
	b.ShowName()
}