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 Intermediate Swift Extensions and Protocols Protocol Extensions

Ayo Omotosho
Ayo Omotosho
4,855 Points

A lil help here pls

In the editor, you've been provided with a protocol, Calculator, that contains a single requirement - a method that computes the square of a value. Your task is to provide a default implementation for the method through a protocol extension.

protocols.swift
protocol Calculator {
  func square(_ value: Double) -> Double
}

// Enter your code below

extension Calculator {
   var value: Double {
    return value * value
  }
}

1 Answer

Christian Mangeng
Christian Mangeng
15,970 Points

Hi Ayo,

the question asks you to implement a default version of "square" in the extension, such that it outputs the square of value. You can copy/paste the method (the function) from the Calculator protocol into the extension and modify it such that it does so. You alraedy have the correct return line in your code.

Ayo Omotosho
Ayo Omotosho
4,855 Points

I see! Got it now! Thanks alot.