this program doesn't run I don't know why Iam using strawberry in a Xp machine 
#! perl
use Benchmark;
@junk = cat /etc/motd;
$count=10_000;
timethese($count, {
    'map' =>sub {my @a=@junk;
            map {s/a/b } @a;
                                        return @a },
                  'for' =>sub  {my @a=@junk;
                                       for (@a)  {  s/a/b/};
          return @a},
                      });
"my $var = defined(<STDIN>)";

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In reply to strawberry on XP by ray.perlling

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