Why does this code not work?

Hi Mark,

You're very close. Still a rookie myself but it looks like the error in your code stems from the description variable. It looks like you are getting a bit confused between declaring a variable and declaring a function / method (I still get confused to).

Instead of trying to return as a function inside the struct, I declared a constant 'description' and wrote the code in the initalizer method. You then call the initialiser method on the instance of the struct. Hope that helps, worked for me

struct RGBColor {
    let red: Double
    let green: Double
    let blue: Double
    let alpha: Double
    let description: String

    init(red: Double, green: Double, blue: Double, alpha: Double) {
        self.red = red
        self.green = green
        self.blue = blue
        self.alpha = alpha
        self.description = "red: \(red), green: \(green), blue: \(blue), alpha: \(alpha)"
    }
}

var r = RGBColor(red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0)
let whatColour = r.description

Thank for reviewing my code Joshua. Yes, I was a bit confused because in my previous code

struct Person { let firstName: String let lastName: String

func fullName()-> String{
    var wholeName: String {
        return (firstName + " " + lastName)
    }
    return wholeName
}

}

I was able create a variable inside a function and have it return a string. I thought maybe I could do the same thing.