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iOS Swift Enums and Structs Enums Enum Members and Raw Values

Posted by Pros Seng
Pros Seng
3,402 Points

I'm getting a weird error when I do: let turtleSpeed: Int = Speed (rawValue: 10)

Cannot convert from one type to another.

enum.swift 
enum Speed: Int {
    case Slow = 10, Medium  = 50, Fast = 100
}

let turtleSpeed: Int = Speed (rawValue:10)

1 Answer

Steve Hunter
Steve Hunter
57,712 Points
Steve Hunter
Steve Hunter
57,712 Points

Hi there,

There's a couple of points there. The variable, turtleSpeed needs to be just that, a variable - so you need to declare it with var not let - that's a bit picky, though!!

The key thing, is what you're assigning to it. That requires dot notation to work. It should look like:

enum Speed: Int {
    case Slow = 10, Medium = 50, Fast = 100
}

var turtleSpeed = Speed.Slow.rawValue

I hope that makes sense! Please ask if it doesn't.

Steve.

Pros Seng
Pros Seng
3,402 Points

I see. I thought I could use the syntax that he showed:

let quarter = Coin (rawValue: 25)

And just create it from raw values. Instead of retrieving the raw value and then assigning it to the var turtleSpeed.

Hmmm it was a bit picky with let vs var. :P

Thanks a bunch!

Steve Hunter
Steve Hunter
57,712 Points

Yeah - I remember being confused when I took this challenge as I was expecting to use the notation you used, rather than dot notation. Much frustration later, I figured it out which is why I remember it so clearly to help out now!