Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Intermediate Swift Extensions and Protocols Protocol Extensions

Rea Rahhal
PLUS
Rea Rahhal
Courses Plus Student 4,732 Points

Make sure you're providing a default implementation for square inside the protocol extension

Confused about my code ...

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

// Enter your code below
extension Calculator {
    func square(value: Double) -> Double {
        return value * value
    }
}