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An Introduction to Programming in Go

Exercise on Composition

Explore how to implement composition in Go by using embedded structs to reuse methods effectively. Learn to extend functionality by accessing methods from one struct within another, focusing on practical application within Go's type system.

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Question

Looking at the User / Player example, you might have noticed that we composed Player using User. This means that a Player should be able to access methods defined in the User struct. In the code given below, add additional code to the GreetingsForPlayer function so that it uses the Greetings function from the User struct to print the string that the Greetings function is printing right now:

Go (1.6.2)
package main
import "fmt"
import "encoding/json"
type User struct {
	Id             int
	Name, Location string
}
func (u User) Greetings() string {
	return fmt.Sprintf("Hi %s from %s",
                     u.Name, u.Location)
}
type Player struct {
	u User
	GameId int
}
func GreetingsForPlayer(p Player) string{
  //insert code
  
  return ""; //modify the statement to return the required string
}