struct SecretHandshake {

    var commandValue: Int
    var commandValues = [1: "wink", 2: "double blink", 4: "close your eyes", 8: "jump"]

    init(_ commandValue: Int) {
        self.commandValue = commandValue
    }

    var shouldReverse: Bool { return (commandValue & 16) != 0 }

    var commands: [String] { return commandsFunc() }

    private func commandsFunc() -> [String] {
        var commands = [String]()
        for key in Array(commandValues.keys).sorted( by: < ) where (commandValue & key) != 0 {
            commands.append(commandValues[key]!)
        }

        if shouldReverse {
            return Array(commands.reversed())
        } else {
            return commands
        }
    }
}