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Emre Havan
8,569 PointsInit function problem for a Struct
I was trying to solve the challenge for Structs in ios.
I am new to programming, and I believe that I've written the codes for this task as it is supposed to be written.
I just cant move forward, and I don't want to jump ahead before Im done with this.
Do you have any idea why I am getting an error when I check my work?
IM COPYING THE TASK DESCRIPTION BELOW:
---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"---
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: \(self.red) green: \(self.green) blue: \(self.blue) alpha: \(self.alpha)"
}
}
2 Answers
Jennifer Nordell
Treehouse TeacherHi there! You're doing terrific. Really, you are. There are many who get stumped on this one and not even close to the reason you're stumped. Yours is a tiny little omission. Your string in the description is supposed to have commas in between the colors. Take another look at the example string and see what I mean.
"red: 86.0, green: 191.0, blue: 131.0, alpha: 1.0"
When I insert the commas in the right places in your code, it passes with flying colors!
Michael Williams
Courses Plus Student 8,059 PointsThank you Emre. That was helpful.
Emre Havan
8,569 PointsEmre Havan
8,569 PointsAh thank you so much! I forgot some commas :D it was driving me crazy and Im finally done with it! Thanks!!
Michael Williams
Courses Plus Student 8,059 PointsMichael Williams
Courses Plus Student 8,059 PointsLike the OP, I ran into a problem. However, I had assigned number values to each of the properties, i.e.:
self.red = 86.0 self.green = 191.0 self.blue = 131.0 self.alpha = 1.0I did this because I was reading Apple's language guide and it showed examples where you give properties specific values in the
initmethod. So why doesn't this work for this exercise.Secondly, why isn't
descriptiona parameter in theinitmethod? Like so:init(red: Double, green: Double, blue: Double, alpha: Double, description: String) {}Also, I was tracking with the struct stuff, albeit a little slowly, but this init stuff really confused the heck out of me–even after rewatching the video a bunch of times. Will it start to make sense later on?
Emre Havan
8,569 PointsEmre Havan
8,569 PointsHi Michael,
I am also new to the programming and Swift syntax but as I know, "description" is not a parameter in the init method. Because, we dont want any user to assign it to any value or string, While we do self.x = x for others, we dont do it for description, since we want it to return a value contains the parameters entered by the user, so we assign it differently.
Lets say there is going to be an "x" value in a "class". We want "x" to be, lets say "10" for every instances of this class. So while writing the init of this class, we dont ask it from a user as a parameter, but we write it down like "self.x = 10" instead. So now this x value is going to have 10 value for every instances created from this class in the future.
I hope this helps.
Also, this init was also confusing me, but I kept practicing and now I feel like, I have a better understanding of it :)