Perl 6 has that basically built-in with the X ("cross") operator: 

say (('red','blue') X ('small','medium','large') X (1,2,3,4)).tree.map
+: *.join('-');

[download]

produces

red-small-1 red-small-2 red-small-3 red-small-4 red-medium-1 red-mediu
+m-2 red-medium-3 red-medium-4 red-large-1 red-large-2 red-large-3 red
+-large-4 blue-small-1 blue-small-2 blue-small-3 blue-small-4 blue-med
+ium-1 blue-medium-2 blue-medium-3 blue-medium-4 blue-large-1 blue-lar
+ge-2 blue-large-3 blue-large-4

[download]
Perl 6 - second systems done right

In reply to Re: Combinations / permutations... not even sure what this is called by moritz
in thread Combinations / permutations... not even sure what this is called by tunafish

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