use strict;
use warnings;
use Benchmark qw(cmpthese);

my %hash = ( 1 => 'one' , 2 => 'two' , 3 => 'three' );

cmpthese
  (-1,
    {
    'orig'        => sub {orig ()},
    'roy'         => sub {roy ()},
    'GF'          => sub {GF ()},
    'VS'          => sub {VS ()},
    'davido'      => sub {davido ()},
    'sneekyGF'    => sub {sneekyGF ()},
    'sneekyDuff'  => sub {sneekyDuff ()},
    }
  );
  
sub orig {
  my (@one, @two);
  foreach ( keys %hash ) {
    push @one , $hash{$_};
    push @two, $_;
  }
}

sub roy {
  my (@one, @two);
  push @one, values %hash;
  push @two, keys %hash;
}

sub GF {
  my (@one, @two);
  (push @one , $hash{$_}), push @two, $_ foreach ( keys %hash );
}

sub VS {
  my (@one, @two);
  @one = values %hash;
  @two = keys %hash;
}

sub davido {
  my( @one ) = @hash{ my( @two ) = keys %hash };
}

sub sneekyGF {
  my (@one, @two);
  --$| ? push @one, $_ : push @two, $_ foreach %hash;
}

sub sneekyDuff {
  my (@one, @two);
  push @{--$| ? \@one : \@two}, $_ for %hash;
}

sub BUK {
  my (@one, @two);
  1 while ( $one[@one], $two[@two] ) = each %hash;
}