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 trialKimanie Williams
5,472 PointsDo not understand what I am doing wrong
Im confused
protocol Calculator {
func square(_ value: Double) -> Double
}
// Enter your code below
extension Math {
func square(_ value: Double) -> Double {
guard let mycares = value(self) else {
return nil
}
return mycares * value
}
}
1 Answer
Arman Arutyunov
21,900 PointsThe extension should be of a Calculator protocol. And it should contain an implementation of that protocol's method. The method should return a squared value of your parameter "value". That's just value * value.
protocol Calculator {
func square(_ value: Double) -> Double
}
// Enter your code below
extension Calculator {
func square(_ value: Double) -> Double {
return value*value
}
}
Hope it helps!