musique/examples/factorial.mq

----------------------------------------------------------------------------
This example shows how to implement factorial operation using different
implementation techniques, showing how one can iterate and accumulate
using Musique programming language
----------------------------------------------------------------------------

-- Calculate factorial using recursive approach
factorial_recursive := (n |
	if (n <= 1)
		1
		(n * (factorial_recursive (n-1)))
),

-- Calculate factorial using iterative approach
factorial_iterative := (n |
	x := 1,
	for (range 1 (n+1)) (i | x *= i),
	x
),

-- Calculate factorial using composition of functions
factorial := (n | fold '* 1 (1 + up n)),

-- Gather all functions into array, and iterate over it
-- This allows to reduce repeatition of this test case
for (factorial_recursive, factorial_iterative, factorial) ( factorial |
	for (up 10) ( n |
		say (factorial (n)),
	)
),