class User {
var username = "Anonymous"
// creating a function to copy
func copy() -> User {
let user = User()
user.username = username
return user
}
}
var user1 = User()
var user2 = user1.copy() // copying user1
user2.username = "Taylor"
var user3 = user2
print(user1.username) // print: "Anonymous"
print(user2.username) // print: "Taylor"
print(user3.username) // print: "Taylor"
