As aptly said by BrowserUk and other monks, it is almost never necessary to use linked lists in Perl. And, as illustrated by GotToBTru, a simple array can do it just as well in Perl (because it is so easy in Perl to add or remove items anywhere in the array).

However, this is your code quickly modified to make a doubly-linkled list in the old fashion (I leave out the tail as an exercise): 

#!/usr/bin/perl

use strict;
use warnings;

my $head = {data => 0, prev => undef, next => undef};
my $previous = $head;

while (<DATA>){
    chomp;
    $previous->{next} = {
                "data" => $_ , 
                "next" => undef,
                "prev" => $previous,
            };
    $previous = $previous->{next};
}

my $curr = $head;
while (1) {
    last unless defined $curr->{next};
    print "Current: ", $curr->{data}, 
          "\tPrevious: ", $curr->{prev}{data} // "", 
          "\tNext: ", $curr->{next}{data} // "", "\n";
    $curr = $curr->{next};
}

__DATA__
1
2
3
4
5

[download]
This prints the values of the items in the list: 
$ perl  doubly_linked.pl
Current: 0      Previous:       Next: 1
Current: 1      Previous: 0     Next: 2
Current: 2      Previous: 1     Next: 3
Current: 3      Previous: 2     Next: 4
Current: 4      Previous: 3     Next: 5

[download]
And this is a Data Dumper view of the structure: 
$VAR1 = {
          'next' => {
                      'next' => {
                                  'next' => {
                                              'next' => {
                                                          'next' => {
                                                                      
+'next' => undef,
                                                                      
+'prev' => $VAR1->{'next'}{'next'}{'next'}{'next'},
                                                                      
+'data' => '5'
                                                                    },
                                                          'prev' => $V
+AR1->{'next'}{'next'}{'next'},
                                                          'data' => '4
+'
                                                        },
                                              'prev' => $VAR1->{'next'
+}{'next'},
                                              'data' => '3'
                                            },
                                  'prev' => $VAR1->{'next'},
                                  'data' => '2'
                                },
                      'prev' => $VAR1,
                      'data' => '1'
                    },
          'prev' => undef,
          'data' => 0
        };

[download]

In reply to Re: Doubly link list implementation by Laurent_R
in thread Doubly link list implementation by punitpawar

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