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|
use v6d;
################################################################################
=begin comment
Perl Weekly Challenge 068
=========================
Task #2
-------
*Reorder List*
=end comment
################################################################################
#--------------------------------------#
# Copyright © 2020 PerlMonk Athanasius #
#--------------------------------------#
#===============================================================================
unit class SinglyLinkedList;
#===============================================================================
has $.head = Nil;
#-------------------------------------------------------------------------------
method append(Str:D $element)
#-------------------------------------------------------------------------------
{
my %node = datum => $element, next => Nil;
if $!head
{
my Hash $current = $!head;
$current = $current{'next'} while $current{'next'};
$current{'next'} = %node;
}
else
{
$!head = %node;
}
}
#-------------------------------------------------------------------------------
method remove-tail(--> Hash:D)
#-------------------------------------------------------------------------------
{
my Hash $tail;
my Hash $current = $!head;
if $current
{
if $current{'next'}
{
$current = $current{'next'}
while $current{'next'} && $current{'next'}{'next'};
$tail = $current{'next'};
$current{'next'} = Nil;
}
else
{
$tail = $current;
$!head = Nil;
}
}
return $tail;
}
#-------------------------------------------------------------------------------
method insert(Hash:D $current, Hash:D $node-to-add)
#-------------------------------------------------------------------------------
{
my $old-next;
if $!head && $current
{
$old-next = $current{'next'};
$current{'next'} = $node-to-add;
}
else
{
$old-next = $!head;
$!head = $node-to-add;
}
$node-to-add{'next'} = $old-next;
}
#-------------------------------------------------------------------------------
method print(Str:D $title)
#-------------------------------------------------------------------------------
{
$title.print if $title;
if $!head
{
my $current = $!head;
while $current
{
$current{'datum'}.print;
$current = $current{'next'};
($current ?? ' -> ' !! "\n").print;
}
}
else
{
'<empty>'.put;
}
}
################################################################################
|
