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iOS Object-Oriented Swift 2.0 Class Inheritance Overriding Methods

overiding methods

how to work this out?

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

1 Answer

Tobias Helmrich
Tobias Helmrich
31,602 Points

Hey Raj,

first you have to create a class called Doctor which should inherit from Person. You can do so by writing a colon and the name of the class the new class should inherit from.

After that you have to override the existing getFullName function by writing the keyword override in front of it. You should change the function so it returns "Dr." followed by the last name instead of returning the first name and last name like the function would normally do.

Lastly you have to create an instance of the Doctor class and assign it to the someDoctor constant.

Like so:

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

let someDoctor = Doctor(firstName: "Sam", lastName: "Smith")

I hope that helps, if you have further questions feel free to ask! :)