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Start your free trialJonas Moltumyr
1,939 Pointscreate a initalizer for rgbColor
Here´s the task:
In the editor, I’ve declared a struct named RGBColor that models a color object in the RGB space.
Your task is to write a custom initializer method for the object. Using the initializer assign values to the first four properties. Using the values assigned to those properties create a value for the description property that is a string representation of the color object.
For example, given the values 86.0 for red, 191.0 for green, 131.0 for blue and 1.0 for alpha, each of the stored properties should hold these values and the description property should look like this:
"red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0"
Note: Init methods typically list parameters in the same order of property declaration. For this task, stick to the order red,green,blue,alpha.
I dont quite understand what the task wants me to to with the constant description. Thought I should return the value as the description string, but I get som syntax errors it seems.
need some help on this one :) Thanks in advanced.
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
}
return description("red: \(red), green: \(green), blue: \(blue), alpha:\(alpha)")
}
5 Answers
Jonas Moltumyr
1,939 PointsI understand what I did wrong...
here is the right code if anyone needs some help with this code challenger.
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)")
}
}
Omar De Yamlor
10,980 PointsHi, why would you use a set of parenthesis to interpolate description property's values ?
This is all fine too :
self.description = "red: \(colorRed), green: \(colorGreen), blue: \(colorBlue), alpha: \(opacity)"
Steve Hunter
57,712 PointsHow did you come across this post? This was made in Feb 2016 relating to a language version that is now long obsolete.
Did you have a question you wanted answering?
Steve.
Diana Tiffany Bosso
3,188 PointsCan someone explain the last line to me please?
Steve Hunter
57,712 PointsYes!
The init
method needs to assign a value into all stored properties. The first 4 are all passed in as arguments, so red, green, blue and alpha are set by user input.
The last stored property, description
, is made up of the other passed-in values. So the assignment into description
is made up of a multiple interpolation of the other stored properties into a prescribed string.
Is that clear? If not, ask me a question and I'll answer it.
Steve.
Diana Tiffany Bosso
3,188 PointsYes I got it thanks!
Steve Hunter
57,712 PointsGrayson Hary
5,033 PointsSteve, your explanation is very helpful!!!
Steve Hunter
57,712 PointsThank you!
Steve Hunter
57,712 PointsSteve Hunter
57,712 PointsGlad you got it fixed; I'll mark this as closed.
Steve.
Rich Braymiller
7,119 PointsRich Braymiller
7,119 Pointsthank you, i had most of it, that last line just threw me off...difficult when they throw stuff in when its not even in the previous video...SMH