Can AnyOne explain the problem I did not quite get it?

It wants you to create an initializer method, so when you create an instance of the Struct you have to put in the values for red, green, blue, and alpha. It also wants you to initialize the description constant as a String that concatenates all of the color values together.

So for example, once I create my instance method, I can create an instance of the Struct by saying something like: let color = RGBColor(red: 23, green: 23, blue: 23, alpha: 1) Then, I can say: color.description and it would return: "red: 23.0, green: 23.0, blue: 23.0 alpha: 1.0".

The whole solution looks like this:

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

let description: String

// Add your code below

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)")

}

}

Let me know if that makes sense if not I will do my best to help you out!