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Posted by Joost Diepenmaat on February 28, 2008, 7:40 am
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> I found great small javascript function that does permutations but
> this is quite an unusual one.
I can't really make sense of your description. If the code is that
simple it's probably short enough to post it here.
> javascipt code is very simple and it looks like too simple to
> understand by me (Perl newbie)
> because there is no direct loop, just calling a sub from inside this
> same sub
Yes, recursion. If you've never seen it before it may take a little
getting used to, I guess. Perl can do this just fine:
# this is an extremely silly example
function rec {
my $i = shift;
if ($i <= 0) {
return 0;
}
else {
return $i + rec($i-1);
}
}
> I'm having troubles in understanding this code and then rewriting in
> Perl so my question is this :
> would it be easier to use some javascript module for Perl and paste
> javascipt code inside perl script or rewriting this but with help of
> permutation modules ?
Using a javascript module for something that sounds as simple as this is
probably complicating the matter too much. You can translate most
javascript code fairly easily to perl.
> Problem is that there are 3 or 4 letters per digit and user can input
> whatever long number string.
I don't know what you're talking about.
--
Joost Diepenmaat | blog: http://joost.zeekat.nl/ | work: http://zeekat.nl/
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