Swift 打印整数二进制表示形式的快速递归函数

我想知道打印整数二进制表示的递归函数在swift中会是什么样子？

下面是一个可能的实现：

func toBinary(_ n: Int) -> String {
    if n < 2 {
        return "\(n)"
    }

    return toBinary(n / 2) + "\(n % 2)"
}

print(toBinary(11))  // "1011"
print(toBinary(170)) // "10101010"

输出：

func printBinary(_ n: Int, terminator: String = "\n") {
    if n < 2 {
        print(n, terminator: terminator)
    }
    else {
        printBinary(n / 2, terminator: "")
        print(n % 2, terminator: terminator)
    }
}

printBinary(11)
printBinary(170)

printBinary(23, terminator: "")
print(" is the representation of 23 in binary")

1011
10101010
10111 is the representation of 23 in binary