Swift inheritance and classes - ios

Question

I am learning swift on my own but I cannot manage to make this code run, I am trying to create a class "Inhabitant" inheriting from Person class with a new "Country" property, have 2 initializers:
- one that takes firstname and lastname and sets the country to an empty String
- one that takes firstname, lastname and country
and create a computed property description of String type that return a the firstname, lastname and country separated by a space
class Person {
var firstname: String
var lastname: String
var fullname: String {
return firstname + " " + lastname
}
init(firstname: String, lastname: String) {
self.firstname = firstname
self.lastname = lastname
}
}
class Inhabitant: Person {
var country: String? = nil
var description: String {
return firstname + " " + lastname + " " + country ?? ""
}
override init(firstname: String, lastname: String) {
super.init(firstname: <#T##String#>, lastname: <#T##String#>)
self.country = ""
}
init(firstname: String, lastname: String, Country: String) {
super.init(firstname: <#T##String#>, lastname: <#T##String#>)
}
}
func tst() {
let perso = Inhabitant(firstname: "toto", lastname: "bobo")
print(perso)
}
The code won't run:
Editor placeholder in source file

Answer 1

I would do something like this:
class Person {
var firstname: String
var lastname: String
var fullname: String {
return firstname + " " + lastname
}
init(firstname: String, lastname: String) {
self.firstname = firstname
self.lastname = lastname
}
}
class Inhabitant: Person {
var country: String? = nil
var description: String {
//1
return "\(firstname) \(lastname) \(country ?? "")"
}
override init(firstname: String, lastname: String) {
//2
super.init(firstname: firstname, lastname: lastname)
self.country = ""
}
init(firstname: String, lastname: String, country: String) {
super.init(firstname: firstname, lastname: lastname)
self.country = country
}
}
func tst() {
let perso = Inhabitant(firstname: "toto", lastname: "bobo")
let perso2 = Inhabitant(firstname: "toto", lastname: "bobo", country: "Belgium")
print(perso.fullname)
print(perso2.description)
}
tst()
Explanations:
String interpolation in swift are done with this syntax, cf swift programming language
When you override the initialiser, what you want is to pass the arguments you receive to your super initialiser.