type embedding

 
type Whisperer interface {
	Whisper() // <- changes to whisperer will propagate to Talker
}
 
type Yeller interface {
	Yell()
}
 
// embedding these interfaces into Talker
type Talker interface {
	Whisperer
	Yeller
}
 
func main() {
	t := // some talker
	t.Whisper()
	t.Yell()
}

Embedding structs

 
type Account struct {
	id, balance int
}
 
func (a Account) GetId() int {
	return a.id
}
 
func (a Account) String() string {
	return fmt.Sprintf("Regular account")
}
 
// ManagerAccount has an embedded struct
type ManagerAccount struct {
	Account
}
 
func (m ManagerAccount) String() string {
	return fmt.Sprintf("Manager account")
}
 
func main() {
	ma := ManagerAccount{Account{1, 2000}}
	
	// since the account is embedded the following will work
	managerId := ma.GetId()
	managerBalance := ma.balance
	
	fmt.Println(ma.String()) // Will print "Manager account"
	fmt.Println(ma.Account.String()) // Will print "Regular account"
}