CountDownStream

count_down_steream.swift

/// Creating Stream for CountDown
func createCountDown(_ n: Int) -> Array<Any> {
    guard n > 0 else {
        return [0]
    }

    return [n, {
        return createCountDown(n-1)
    }]
}

func startCountDown(_ countDown: Array<Any>) {
    //start counting down
    for i in countDown {
        switch i {
        case is Int:
            print(i, terminator: " ")
        case is (Void) -> Array<Any>:
            let next = i as! (Void) -> Array<Any>
            startCountDown(next())
        default:
            print("ERROR")
        }
    }
}


let countDown = createCountDown(5)
startCountDown(countDown)
// 5 4 3 2 1 0