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MooseX::AttributeHelpers::MethodProvider::List(3) User Contributed Perl Documentation MooseX::AttributeHelpers::MethodProvider::List(3)
 

MooseX::AttributeHelpers::MethodProvider::List

version 0.25

   package Stuff;
   use Moose;
   use MooseX::AttributeHelpers;
   has 'options' => (
       metaclass  => 'Collection::List',
       is         => 'rw',
       isa        => 'ArrayRef[Str]',
       default    => sub { [] },
       auto_deref => 1,
       provides   => {
           elements => 'all_options',
           map      => 'map_options',
           grep     => 'filter_options',
           find     => 'find_option',
           first    => 'first_option',
           last     => 'last_option',
           get      => 'get_option',
           join     => 'join_options',
           count    => 'count_options',
           empty    => 'do_i_have_options',
           sort     => 'sorted_options',
       }
   );
   no Moose;
   1;

This is a role which provides the method generators for MooseX::AttributeHelpers::Collection::List.

meta

count
Returns the number of elements in the list.
   $stuff = Stuff->new;
   $stuff->options(["foo", "bar", "baz", "boo"]);
   my $count = $stuff->count_options;
   print "$count\n"; # prints 4
    
empty
If the list is populated, returns true. Otherwise, returns false.
   $stuff->do_i_have_options ? print "Good boy.\n" : die "No options!\n" ;
    
find
This method accepts a subroutine reference as its argument. That sub will receive each element of the list in turn. If it returns true for an element, that element will be returned by the "find" method.
   my $found = $stuff->find_option( sub { $_[0] =~ /^b/ } );
   print "$found\n"; # prints "bar"
    
grep
This method accepts a subroutine reference as its argument. This method returns every element for which that subroutine reference returns a true value.
   my @found = $stuff->filter_options( sub { $_[0] =~ /^b/ } );
   print "@found\n"; # prints "bar baz boo"
    
map
This method accepts a subroutine reference as its argument. The subroutine will be executed for each element of the list. It is expected to return a modified version of that element. The return value of the method is a list of the modified options.
   my @mod_options = $stuff->map_options( sub { $_[0] . "-tag" } );
   print "@mod_options\n"; # prints "foo-tag bar-tag baz-tag boo-tag"
    
sort
Sorts and returns the elements of the list.
You can provide an optional subroutine reference to sort with (as you can with the core "sort" function). However, instead of using $a and $b, you will need to use $_[0] and $_[1] instead.
   # ascending ASCIIbetical
   my @sorted = $stuff->sort_options();
   # Descending alphabetical order
   my @sorted_options = $stuff->sort_options( sub { lc $_[1] cmp lc $_[0] } );
   print "@sorted_options\n"; # prints "foo boo baz bar"
    
elements
Returns all of the elements of the list
   my @option = $stuff->all_options;
   print "@options\n"; # prints "foo bar baz boo"
    
join
Joins every element of the list using the separator given as argument.
   my $joined = $stuff->join_options( ':' );
   print "$joined\n"; # prints "foo:bar:baz:boo"
    
get
Returns an element of the list by its index.
   my $option = $stuff->get_option(1);
   print "$option\n"; # prints "bar"
    
first
Returns the first element of the list.
   my $first = $stuff->first_option;
   print "$first\n"; # prints "foo"
    
last
Returns the last element of the list.
   my $last = $stuff->last_option;
   print "$last\n"; # prints "boo"
    

Bugs may be submitted through the RT bug tracker <https://rt.cpan.org/Public/Dist/Display.html?Name=MooseX-AttributeHelpers> (or bug-MooseX-AttributeHelpers@rt.cpan.org <mailto:bug-MooseX-AttributeHelpers@rt.cpan.org>).
There is also a mailing list available for users of this distribution, at <http://lists.perl.org/list/moose.html>.
There is also an irc channel available for users of this distribution, at "#moose" on "irc.perl.org" <irc://irc.perl.org/#moose>.

Stevan Little <stevan@iinteractive.com>

This software is copyright (c) 2007 by Stevan Little and Infinity Interactive, Inc.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
2016-02-16 perl v5.28.1

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