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 Structs and their Methods Struct Methods

add a method named calculateTaxes which accepts a parameter named 'percentage of type Double and dose not return anythin

Can't seem to figure out whats wrong?

struct Expense {
    var description: String
    var amount: Double = 0.0

    init (description: String) {
        self.description = description

    func calculateTaxes ("percentage") -> Double {
    // it should accept only one parameter named 'percentage' of type Double

1 Answer

Brendan Drake
Brendan Drake
4,162 Points

You have percentage in quotations, which would make it a string. All parameters should not be in quotes; for example it should look like" func calculateTaxes (percentage: Double) -> Double ". Also since the prompt says to not return anything, you should take away the " -> Double " part at the end of that line of code. Thats where you specify which type of data is being returned. If you are not returning anything, you don't put anything there. Hope this helps!