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Michael Bau
3,394 PointsHelp with init challenge!
Hi Community,
sigh I am stuck once more with a code challenge!
I can not figure out how to treat the 'description: String' constant. Are you supposed to add an unique initializer method here, or what? I constantly get the error message that a ‘self’ is missing regarding the ‘description’ leading me to believe that that is indeed the case, but I might, of course, be mistaken.
Any help here would be much appreciated!
Best regards, Michael
struct RGBColor {
let red: Double
let green: Double
let blue: Double
let alpha: Double
let description: String
init(red: Double, green: Double, blue: Double, aplha: Double) {
self.red = red
self.green = green
self.blue = blue
self.alpha = yellow
}
// Add your code below
}
3 Answers
Jennifer Nordell
Treehouse TeacherHi there! You're so close here, that I feel like it'd be better at this point to just give you some hints. First, and foremost, you have a small error. You have self.alpha = yellow. But yellow was not passed in.... alpha was. Keep in mind that in the digital world the primary colors are red, blue and green. The "alpha" value indicates transparency of the color and nothing else.
self.alpha = alpha- You have all the building blocks now to build that string.
- the string is comprised of a few labels as shown in the example
- the string also contains the values of red, blue, green and alpha
- self.description should equal the string that you've put together
- no additional init or any other method is needed here
Hope this helps, but let me know if you're still stuck!
Michael Bau
3,394 PointsHi Jennifer,
Thanks a lot for your response!
I have tried the below code, but get the message: 'Make sure the string you're assigning to the description property matches the example in the instructions'.
I can't figure out what is missing as compared to the example provided in the code challenge, or if I am even on the right track here.
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), 86.0, \(green), 191.0, \(blue), 131.0, \(alpha), 1.0"
}
}
Is it the above 'self.description´ string interpolation the right approach?
Thanks and best regards, Michael
Jennifer Nordell
Treehouse TeacherHi there! Close, but not quite. Part of the problem here is that you've gotten the example numbers that are passed in upon creation of the RGBColor hard-coded in your string. The example says that they instantiate a new RGBColor with the values 86.0, 191.0, 131.0, 1.0. But we want those numbers to be changeable. I might want to create an entirely different color with the values 23.0, 88.0, 110.0, and 0.5. But if I were to do that right now with your code, this is what the description would hold: "23.0, 86.0, 88.0, 191.0, 110.0, 0.5, 1.0" which is obviously, not what we're looking for. Take a look at the line you need:
self.description = "red: \(red), green: \(green), blue: \(blue), alpha: \(alpha)"
If I use this, with the values I just mentioned in my example above, the string stored would be "red: 23.0, blue: 86.0, green: 88.0, alpha: 0.5".
Hope this helps!
Michael Bau
3,394 PointsHi Jennifer,
Thanks again and thanks for the explanation. It works now!
Best regards, Michael