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 Swift Enums and Structs Enums and their Methods Methods or Member Functions

Methods or Member Functions code challenge

I have no clue how to remove the currentValue and replace it with self.

The question is: Modify the isGreater function to only accept one parameter. Keep the newValue parameter and remove the currentValue parameter because you can retrieve the existing value using the keyword self.

My code:

enum Coin: Int { case Penny = 1, Nickel = 5, Dime = 10, Quarter = 25

func isGreater(currentValue: Coin, newValue: Coin) -> Bool {
    return currentValue.rawValue - self.rawValue


1 Answer

Burak Boysan
Burak Boysan
1,205 Points

You should erase the currentValue in function input (delete currentValue: Coin,) and also you should change currentValue.rawvalue with self.rawvalue.

Thank you!! It worked!