use strict;
use warnings;

use Benchmark qw(:all) ;

my $to = 10_000;

cmpthese(-5,
    {
        'Map100k' => sub { my $sum = 0;
                   map { $sum += $_ } 
                   1 .. 100_000;
                 },
        'For100k' => sub { my $sum = 0;
                   $sum += $_ for 1 .. 100_000;
                 },

        'Map10k' => sub { my $sum = 0;
                   map { $sum += $_ } 
                   1 .. 10_000;
                 },
        'For10k' => sub { my $sum = 0;
                   $sum += $_ for 1 .. 10_000;
                 },

        'Map1k' => sub { my $sum = 0;
                   map { $sum += $_ } 
                   1 .. 1_000;
                 },
        'For1k' => sub { my $sum = 0;
                   $sum += $_ for 1 .. 1_000;
                 },
    });

__END__
          Rate Map100k For100k  Map10k  For10k   Map1k   For1k
Map100k 18.6/s      --    -19%    -90%    -92%    -99%    -99%
For100k 23.1/s     24%      --    -88%    -90%    -99%    -99%
Map10k   187/s    905%    709%      --    -22%    -91%    -92%
For10k   239/s   1182%    933%     28%      --    -89%    -90%
Map1k   2077/s  11052%   8880%   1009%    770%      --    -13%
For1k   2387/s  12715%  10219%   1175%    899%     15%      --