How can I refer to properties from a struct within a struct/ - swift

Question

I'm trying to get the hang of how to make my code the most efficient using Structs / Classes, and I'm trying to understand it via the following example.
I'd be really grateful if someone could correct me or guide me about the same:
Just as an example, I'll use Harry Potter. There are four houses, and each house has certain characteristics.
So now I have a struct for 2 of them:
struct Gryffindor {
let name = "Gryffindor"
let characteristic = "Brave"
let image = Image("Lion")
}
struct Slytherin {
let name = "Slytherin"
let characteristic = "Cunning"
let image = Image("Snake")
}
Now if I wish to have a wizard struct as follows, but I don't know how to include a House property within, such that when I try to create an instance of a wizard, I can call the properties from their respective houses.
struct Wizard {
let name: String
var house: ?
}
let harryPotter = Wizard(name: "Harry", house: Gryffindor)
Basically, I wish to be able to refer to harry's house using the harryPotter instance, as such:
print(harryPotter.characteristic) //should print "Brave"
Is what I'm trying to achieve even possible?

Answer 1

First of all you are mixing types with objects so you should have a type House
struct House {
let name: String
let characteristic: String
let image: Image
}
And then use that in the Wizard struct
struct Wizard {
let name: String
var house: House
}
And now you create first a House object for the Wizard and then the Wizard object
let gryffindor = House(name: "Gryffindor", characteristic: "Brave", image: Image("Lion"))
let harryPotter = Wizard(name: "Harry", house: gryffindor)
or all in one call
let harryPotter = Wizard(name: "Harry",
house: House(name: "Gryffindor", characteristic: "Brave", image: Image("Lion")))

Answer 2

Use protocol & generics, like below. Tested with Xcode 11.4.
protocol House {
var name: String { get }
var characteristic: String { get }
var image: Image { get }
}
struct Gryffindor: House {
let name = "Gryffindor"
let characteristic = "Brave"
let image = Image("Lion")
}
struct Wizard<H: House> {
let name: String
var house: H
}
let harryPotter = Wizard(name: "Harry", house: Gryffindor())