for := [ start stop iteration |
	if (start > stop)
	[nil]
	[iteration start; for (start + 1) stop iteration]
];

factorial := [n | if (n <= 1) [1] [n * (factorial (n-1))]];
for 1 10 [i | say (factorial i)];

factorial_iterative := [n |
	x := 1;
	for 1 n [i|x *= i];
	x
];
for 1 10 [i | say (factorial_iterative i)];