CODEWITHSUNDEEP
swiftenumsswift2
Matthieu Riegler
Matthieu Riegler

Reputation: 55856

Compare Swift enum regardless of the associated value

Is it somehow possible to test an enum case regardless of the associated value ?

enum Abc {
    case A(a:Int)
    case B(b:Int)
}

let a = Abc.A(a:1)

a == Abc.A  // <= Not possible

Upvotes: 4

Views: 689

Answers (2)

Hamish
Hamish

Reputation: 80951

Sure, you can do this in a switch:

switch a {
case .A:
    print("it's A")
default:
    print("it's not A")
}

Or use pattern matching in an if statement:

if case .A = a {
    print("it's A")
} else {
    print("it's not A")
}

If you're still interested in the associated value after matching the case, you can extract it like so:

switch a {
case .A(let value):
    ...
}


if case .A(let value) = a {
    ...
}

Note @overactor's comment below that you can also write this as case let .A(value) – it's mainly a matter of personal preference.

Upvotes: 4

overactor
overactor

Reputation: 1789

You can use an if case

enum ABC {
    case A(a: Int)
    case B(b: Int)
}

let a = ABC.A(a: 1)

if case .A = a {
    ...
}

Upvotes: 1

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