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iOS Enumerations and Optionals in Swift Objects and Optionals Enums with Raw Values

Tyler Dotson
PLUS
Tyler Dotson
Courses Plus Student 1,740 Points
Posted by Tyler Dotson
Tyler Dotson
Courses Plus Student 1,740 Points

why doesn't this work?

i followed the example from the video and i dont understand why its wrong.

enums.swift 
enum Compass: Int {
    case north = 3
    case south = 4
    case east = 5
    case west = 6
}

if let direction = Comapass(rawValue: south) else {
    return nil
}

2 Answers

Steve Hunter
Steve Hunter
57,712 Points

If you change Comapass to Compass that's a start :wink:

You can chase the errors down by using the Preview button.

You don't need an if let just use let. Then use the rawValue associated with south - that's 4.

That gives you:

enum Compass: Int {
    case north = 3
    case south = 4
    case east = 5
    case west = 6
}

let direction = Compass(rawValue: 4)

Make sense?

Steve.

clintbarron
clintbarron
11,943 Points
clintbarron
clintbarron
11,943 Points

As Steve says, you don't need to use an "if let", just use "let". Also remember that the raw value is the value AFTER the equals sign, not after "case". Hence the raw value for south is "4", not "south". Therefore, as Steve says, your constant should be declared as:

let direction = Compass(rawValue: 4)