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iOS Object-Oriented Swift 2.0 Class Inheritance Overriding Methods

Johann Peters
Johann Peters
40,749 Points
Posted by Johann Peters
Johann Peters
40,749 Points

inheritance getFullName() ?

What's wrong?

class Person { let firstName: String let lastName: String

init(firstName: String, lastName: String) {
    self.firstName = firstName
    self.lastName = lastName
}

func getFullName() -> String {
    return "\(firstName) \(lastName)"
}

} // Enter your code below class Doctor: Person{

override init(firstName: String, lastName: String) {
    super.init(lastName: lastName)
    self.lastName = lastName

} override func getFullName() -> String{ return "Dr. (lastName)" }

} let someDoctor = Doctor.getFullName("Johnson")

classes.swift 
class Person {
    let firstName: String
    let lastName: String

    init(firstName: String, lastName: String) {
        self.firstName = firstName
        self.lastName = lastName
    }

    func getFullName() -> String {
        return "\(firstName) \(lastName)"
    }
}
// Enter your code below
class Doctor: Person{

    override init(firstName: String, lastName: String) {
        super.init(lastName: lastName)
        self.lastName = lastName
}
    override func getFullName() -> String{
        return "Dr. \(lastName)"
    }

}
let someDoctor = Doctor.getFullName("Johnson")

1 Answer

Steve Hunter
Steve Hunter
57,712 Points

Hi Johann,

A couple of issues in your code there - nothing serious so you're on the right track.

Firstly, there's no need to override the initializer. That is fine as it is. The Doctor instance will still have a first and last name, same as a Person.

Your getFullName() is perfect - and that is all that is needed in the Doctor class.

Lastly, you didn't create the instance correctly. You need to create the instance someDoctor then use that instance to try the `getFullName() method. All that looks like:

// Enter your code below
class Doctor: Person {
    override func getFullName() -> String {
        return "Dr. \(lastName)"
    }
}

let someDoctor = Doctor(firstName: "Steve", lastName: "Smith")
someDoctor.getFullName()

I hope that makes sense!

Steve.

Johann Peters
Johann Peters
40,749 Points
Johann Peters
Johann Peters
40,749 Points

Thanks Steve! Good explanation!

Steve Hunter
Steve Hunter
57,712 Points

Glad it helped out!

Steve.