#!/usr/bin/perl 
use strict;
use warnings;

use Benchmark qw(:all);

my %h;

@h{'A'..'Z','a'..'z'} = 1..52;

sub verbose {
   my $hash = shift;
   foreach my $key (sort keys %$hash) {
      print "$key: $hash->{$key}\n";
   }
}

sub verbose2 {
   my $hash = shift;
   foreach (sort keys %$hash) {
      print "$_: $hash->{$_}\n";
   }
}

sub verbose3 {
   my $hash = shift;
   print "$_: $hash->{$_}\n" foreach sort keys %$hash;
}

sub idiom {
   my $hash = shift;
   print map "$_: $hash->{$_}\n", sort keys %$hash;
}

timethese(1000000, {
   'Verbose' => 'verbose(\%h)',
   'Verbose2' => 'verbose2(\%h)',
   'Verbose3' => 'verbose3(\%h)',
   'Idiom' => 'idiom(\%h)',
});

timethese(10000000, {
   'Verbose' => 'verbose(\%h)',
   'Verbose2' => 'verbose2(\%h)',
   'Verbose3' => 'verbose3(\%h)',
   'Idiom' => 'idiom(\%h)',
});