Easier access to an enum's associated values

easyAssociatedValues.swift

enum Result {
    case Success(String)
    case Failure(String)
    
    var successString: String? {
        switch self {
        case let .Success(str):
            return str
        default:
            return nil
        }
    }
    
    var failureString: String? {
        switch self {
        case let .Failure(str):
            return str
        default:
            return nil
        }
    }
}

let aSuccess = Result.Success("Nothing succeeds like success")
println(aSuccess.successString)     // Optional("Nothing succeeds like success")
println(aSuccess.failureString)     // nil