Sha256: 0b7079f78b05e5621b4c5f1cdc71a051f1bcb9b1897fe1019b7598e84d22f0dd

Contents?: true

Size: 1.36 KB

Versions: 323

Compression:

Stored size: 1.36 KB

Contents

package Example;
use strict;
use warnings;

sub new {
   my ($class) = @_;
   return bless {}, $class;
}

sub push {
    my ($self, $value) = @_;

    my $element = Element->new(
       value   => $value,
       prev_e  => $self->{last_e},
       next_e  => undef,
   );
   if ($self->{last_e}) {
      $self->{last_e}{next_e} = $element;
   }
   $self->{last_e} = $element;
   if (not $self->{first_e}) {
       $self->{first_e} = $element;
   }

   return;
}

sub pop {
    my ($self) = @_;

    my $element = $self->{last_e};
    die 'List is empty' if not $element;

    $self->{last_e} = $element->{prev_e};
	$self->{last_e}{next_e} = undef;

    return $element->{value};
}

sub shift {
    my ($self) = @_;

    my $element = $self->{first_e};
    die 'List is empty' if not $element;

    $self->{first_e} = $element->{next_e};
    $self->{first_e}{prev_e} = undef;

    return $element->{value};

}

sub unshift {
    my ($self, $value) = @_;

    my $element = Element->new(
       value   => $value,
       prev_e  => undef,
       next_e  => $self->{first_e},
   );
   if ($self->{first_e}) {
      $self->{first_e}{prev_e} = $element;
   }
   $self->{first_e} = $element;
   if (not $self->{last_e}) {
       $self->{last_e} = $element;
   }
   return;
}


package Element;
use strict;
use warnings;

sub new {
   my ($class, %data) = @_;
   return bless \%data, $class;
}

1;

Version data entries

323 entries across 323 versions & 1 rubygems

Version Path
trackler-2.2.1.105 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.104 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.103 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.102 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.101 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.100 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.99 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.98 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.97 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.96 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.95 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.94 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.93 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.92 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.91 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.90 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.89 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.88 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.87 tracks/perl5/exercises/linked-list/Example.pm
trackler-2.2.1.86 tracks/perl5/exercises/linked-list/Example.pm