NOT condition in 'if case' statement

Question

I have an enum:

enum E {
    case A, B, C(Int)
}

let a: E = .A

Here\'s how I would check if a equals .B

Answer 1

There aren't any answers yet mentioning the guard statement, introduced by Swift 2, which is a neat addition to the tools above and, if you ask me, the cleanest solution if you can live with the requirement to return from your function or closure within the else-block:

guard case .B = a else {
    // a does not match .B
    return
}

See Apple's "The Swift Programming Language (Swift 2.2): Statements" for more info.