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Cool, this is what I came up with yesterday:

by Dog and Pony (Priest)
on Feb 05, 2002 at 09:47 UTC ( #143388=note: print w/replies, xml ) Need Help??

in reply to The Perl Review

Oh, I should have known there would be a thread like this one here somewhere. :)

Anyways, here is my best shot, as it were:

map{$r+=36**$i++*(/\D/?-55+ord:$_)}reverse split'';
The result going into $r, this is 50 or 51 characters depending on if you count the semi-colon. Since this was my first attempt at something like this ever, I think it was pretty good.

As proof of concept, I did try some of the other variants aswell (you only replace the '36' above):

#!/usr/bin/perl # Base 36, [0-9A-Z] $_="II"; map{$r+=36**$i++*(/\D/?-55+ord:$_)}reverse split''; print "$r\n"; # Hex $_="29A"; map{$t+=16**$j++*(/\D/?-55+ord:$_)}reverse split''; print "$t\n"; # Bin $_="1010011010"; map{$s+=2**$k++*(/\D/?-55+ord:$_)}reverse split''; print "$s\n"; # Dec :) $_="666"; map{$u+=10**$l++*(/\D/?-55+ord:$_)}reverse split''; print "$u\n";
Comments on how to not beat this one, but rather if this special path could have been improved would be appreciated. I was looking into some of the deprecated stuff about a split in scalar mode going into @_, but although that shortened the routine with one character, it also produced the wrong result by -36, and with that fixed, it had lost again. :) Same thing with all my tries to get rid of that pesky reverse.

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