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iOS Swift Enums and Structs Enums What is an Enum?

Akos Turi
Akos Turi
7,517 Points
Posted by Akos Turi
Akos Turi
7,517 Points

i got en error message says "default will never be executed"

enum Day {
    case Monday
    case Tuesday
    case Wednesday
    case Thursday
    case Friday
    case Saturday
    case Sunday
}


func weekdayOrWeekend(dayOfWeek: Day) -> String {
    switch dayOfWeek {
        case Day.Monday, Day.Tuesday, Day.Wednesday, Day.Thursday, Day.Friday:
            return "It's a weekday"
        case Day.Saturday, Day.Sunday:
            return "It's the weekend"
        default:
            return "Not a valid day"
    }
}

weekdayOrWeekend(Day.Sunday)

I don't see why it doesn't wanna perform when i give an invalid value

[MOD: edited code block]

1 Answer

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

Hi Akos,

The code does work fine. What error value are you trying to submit?

If you send the method something that isn't a valid Day value, the method call will error rather than the default value being used. If you use a valid Day value, then the switch will pick that up accordingly.

I get a warning that the default will never be used, and that's correct; you have created a mutually exclusive set of rules; you can't submit an error into the switch; that will fail at the method call.

var: errorValue: Int
weekdayOrWeekend("Steve") // Cannot convert value of type String to expected argument type Day
weekdayOrWeekend(errorValue) // cannot convert Int to Day

What behaviour were you expecting from this; what's not acting like you wanted it to?

Steve.