in reply to &1 is no faster than %2 when checking for oddness. Oh well.

Screw the benchmarks! In fact, screw math! 

sub is_odd {
   my $int = shift;
   if ( $int =~ /\D/ ) { die "Not an integer, dummy!" }
   
   substr($int,-1) =~ /[13579]/;
}

[download]

Yes, it's a joke.

<–radiant.matrix–>
Ramblings and references
The Code that can be seen is not the true Code
I haven't found a problem yet that can't be solved by a well-placed trebuchet

In Section Meditations