Skiylia

/// This contains a snippet of Skiylia-code that
    computes the factorial of a number. ///

def factorial(n):
  // return null if n is not an integer.
  if n !~~ 0:
    return null

  // return 1 if n is less than, or equal to, 2.
  if n <= 1:
    return 1

  // otherwise, recursively multiply.
  return n * factorial(n - 1)

var num = 6

print("The factorial of", num, "is", factorial(num))

/// Expected output:
    The factorial of 6 is 720 ///