sub init_hash {
  my ($self) = @_;
  $self->{a_hash}{item1} = {name => 'a', value => '1'};
  $self->{a_hash}{item2} = {name => 'b', value => '2'};
  $self->{a_hash}{item3} = {name => 'c', value => '3'};
  $self->{a_hash}{item4} = {name => 'd', value => '4'};
  1;
}

##</code><code>##

sub print_item3 {
  my ($self) = @_;
  print $self->{a_hash}{item3}{name} . " : " . $self->{a_hash}{item3}{value} . "\n";
}

##</code><code>##

sub print_all_hash {
  my ($self) = @_;
  foreach my $item (keys $self->{a_hash}) {
    print $self->{a_hash}{$item}{name} . " : " . $self->{a_hash}{$item}{value} . "\n";
  }
}

##</code><code>##

Type of arg 1 to keys must be hash (not hash element)