List::Rotation List::Rotation allows to loop through a list of values via a singleton object implemented as closure.
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loop Perl module singleton singleton object loop lists cycle

List::Rotation Description

List::Rotation allows to loop through a list of values via a singleton object implemented as closure. List::Rotation allows to loop (Cycle, Alternate or Toggle) through a list of values via a singleton object implemented as closure.SYNOPSIS use List::Rotation; my @array = qw( A B C ); my $first_cycle = List::Rotation::Cycle->new(@array); my $second_cycle = List::Rotation::Cycle->new(@array); ## the same object is returned as above print $first_cycle->next; ## prints A print $second_cycle->next; ## prints B print $first_cycle->next; ## prints C print $second_cycle->next; ## prints A, looping back to beginning my $alternation = List::Rotation::Alternate->new( qw( odd even ) ); print $alternation->next; ## prints odd print $alternation->next; ## prints even print $alternation->next; ## prints odd $alternation->reset; ## reset the alternation to first item print $alternation->next; ## prints odd my $switch = List::Rotation::Toggle->new; ## prints even numbers between 2 and 10 foreach ( 2..10 ) { print "$_n" if $switch->next; }Use List::Rotation to loop through a list of values. Once you get to the end of the list, you go back to the beginning.List::Rotation is implemented as a Singleton Pattern. You always just get 1 (the very same) Rotation object even if you use the new method several times with the same set of parameters. This is done by using Memoize on the new method. It returns the same object for every use of new that comes with the same list of parameters.The class List::Rotation contains three subclasses:List::Rotation::CycleLoop through a list of arbitrary values. The list must not be empty.List::Rotation::AlternateAlternate two values.List::Rotation::ToggleToggle between true and false. Requirements: · Perl

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