instances

Heather, to create an instance of Person you do this:

let somePerson = Person(name: "x", age: 12)

What this does is call the default initializer for the Person struct and gives it values for each of its parameters. Note that the parameters have to be named name and age.

It might help if you saw the default initializer If you were to put it in the struct the struct would look like this:

struct Person: UserType {
  var name: String
  var age: Int

  init(name: String, age: Int) {
    self.name = name
    self.age = age
  }
}

let somePerson = Person(name: "x", age: 12)

And it will work just like the code without it. When you type Person(name: "x", age" 12) you are calling this initializer with the two values it is expecting. The initializer creates two local variables named name and age, fills them with the values you supplied, and then it assigns those values to its member variables. So name in the somePerson Person object becomes "x", and age becomes 12.

If you write this in Treehouse's Challenge workspace

console.log(somePerson.name)

or this in a Playground

print(somePerson.name)

you would get x. If you have Xcode, I suggest you copy this, create a new Playground, paste it in, and play with it.