CODEWITHSUNDEEP
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RobertL
RobertL

Reputation: 14874

In Swift, given a variable that is an enum, how can I tell which case it is?

As a practical example, suppose I define:

enum Baby {
    case Boy (String)
    case Girl (String)
}

and then define a variable (or constant) like so:

let baby1 = Baby.Boy("Joe")

Now I want to pass baby1 to a function that returns a string that depends on whether baby1 is a boy or a girl. How do I write that function? Or is there no way to do that?

Upvotes: 1

Views: 65

Answers (1)

vacawama
vacawama

Reputation: 154513

I know you said not to answer, but this might help:

Using a switch statement, you can simultaneously detect the case of the enum and extract the String for use:

enum Baby {
    case Boy (String)
    case Girl (String)
}

let baby1 = Baby.Boy("Joe")
let baby2 = Baby.Girl("Sue")

func babyDescription(baby: Baby) -> String {
    switch(baby) {
    case .Boy(let name):
        return "A baby boy named \(name)"
    case .Girl(let name):
        return "A baby girl named \(name)"
    }
}

println(babyDescription(baby1)) // "A baby boy named Joe"
println(babyDescription(baby2)) // "A baby girl named Sue"

Upvotes: 2

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