musique/examples/factorial.mq

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----------------------------------------------------------------------------
This example shows how to implement factorial operation using different
implementation techniques, showing how one can iterate and accumulate
using Musique programming language
----------------------------------------------------------------------------
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-- Calculate factorial using recursive approach
factorial_recursive := [n |
if (n <= 1)
[1]
[n * (factorial_recursive (n-1))]
];
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-- Calculate factorial using iterative approach
factorial_iterative := [n |
x := 1;
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for (range 1 (n+1)) [i|x *= i];
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x
];
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-- Calculate factorial using composition of functions
factorial := [n| fold (1 + up n) 1 '*];
-- 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));
];
];