Computed properties and switch statements

Question

So just worked through the computed properties section of the first course on Intermediate Swift.

I have one question about switch statements inside of a computed property.

When I add a switch statement to a computed property (example below)

let UIFontTextStyleHeadline = "UIFontTextStyleHeadline"
let UIFontTextStyleBody = "UIFontTextStyleBody"
let UIFontTextStyleFootnote = "UIFontTextStyleFootnote"

enum Text {
    case headline
    case body
    case footnote
    case style

    var style: String {
            switch self {
            case .headline: return UIFontTextStyleHeadline
            case .body: return  UIFontTextStyleBody
            case .footnote: return UIFontTextStyleFootnote
        }
    }
}

The compiler tells me that the switch statement isn't exhaustive.

However, looking at the video that follows the above code challenge, Prasan uses switch statements inside of computed properties, that are not exhaustive

Could somebody please explain this to me?

Answer 1 · 2018-01-05T11:45:32Z

January 5, 2018 11:45am

I have answered my own question!

All the enum cases need to be used in the switch statement. My mistake was adding a case called style into the enum! Removing this satisfies the switch statements exhaustive clause and the code compiled.

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Simon Di Giovanni

Simon Di Giovanni

Computed properties and switch statements

1 Answer

Simon Di Giovanni

Simon Di Giovanni