Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Object-Oriented Swift Class Inheritance Overriding Methods

Posted by Nila Palmo Ram
Nila Palmo Ram
4,303 Points

What's wrong!!

Im a bit stuck in this challenge. Help please!!

This is the question: I've provided a base class Person in the editor below. Once an instance of Person is created, you can call fullName() and get a person's full name.

Your job is to create a class named Doctor that overrides the fullName() method. Once you have a class definition, create an instance and assign it to a constant named someDoctor.

For example, given the first name "Sam", and last name "Smith", calling fullName() on an instance of Person would return "Sam Smith", but calling the same method on an instance of Doctor would return "Dr. Smith".

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

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

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

// Enter your code below
class Person {
  let firstName: String
  let lastName: String 

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

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

// Enter your code below

class Doctor: Person {
    override func fullName() -> String {
        return "Dr. \(lastName)"
    }
}

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

1 Answer

Dan Weru
Dan Weru
47,649 Points
Dan Weru
Dan Weru
47,649 Points

Hi,

Make sure that you call fullName() instead of getFullName() like so

class Doctor: Person {
    override func fullName() -> String {
        return "Dr. \(lastName)"
    }
}

let someDoctor = Doctor(firstName: "Sam",  lastName: "Smith")   
someDoctor.fullName()
Nila Palmo Ram
Nila Palmo Ram
4,303 Points

Im still getting an error.

Dan Weru
Dan Weru
47,649 Points
Dan Weru
Dan Weru
47,649 Points

Don’t repeat the Person class