Provided by: libsub-handlesvia-perl_0.035-1_all 
NAME
Sub::HandlesVia::HandlerLibrary::Array - library of array-related methods
SYNOPSIS
package My::Class {
use Moo;
use Sub::HandlesVia;
use Types::Standard 'ArrayRef';
has attr => (
is => 'rwp',
isa => ArrayRef,
handles_via => 'Array',
handles => {
'my_accessor' => 'accessor',
'my_all' => 'all',
'my_all_true' => 'all_true',
'my_any' => 'any',
'my_apply' => 'apply',
'my_clear' => 'clear',
'my_count' => 'count',
'my_delete' => 'delete',
'my_elements' => 'elements',
'my_first' => 'first',
'my_first_index' => 'first_index',
'my_flatten' => 'flatten',
'my_flatten_deep' => 'flatten_deep',
'my_for_each' => 'for_each',
'my_for_each_pair' => 'for_each_pair',
'my_get' => 'get',
'my_grep' => 'grep',
'my_head' => 'head',
'my_insert' => 'insert',
'my_is_empty' => 'is_empty',
'my_join' => 'join',
'my_map' => 'map',
'my_max' => 'max',
'my_maxstr' => 'maxstr',
'my_min' => 'min',
'my_minstr' => 'minstr',
'my_natatime' => 'natatime',
'my_not_all_true' => 'not_all_true',
'my_pairfirst' => 'pairfirst',
'my_pairgrep' => 'pairgrep',
'my_pairkeys' => 'pairkeys',
'my_pairmap' => 'pairmap',
'my_pairs' => 'pairs',
'my_pairvalues' => 'pairvalues',
'my_pick_random' => 'pick_random',
'my_pop' => 'pop',
'my_print' => 'print',
'my_product' => 'product',
'my_push' => 'push',
'my_reduce' => 'reduce',
'my_reductions' => 'reductions',
'my_reset' => 'reset',
'my_reverse' => 'reverse',
'my_sample' => 'sample',
'my_set' => 'set',
'my_shallow_clone' => 'shallow_clone',
'my_shift' => 'shift',
'my_shuffle' => 'shuffle',
'my_shuffle_in_place' => 'shuffle_in_place',
'my_sort' => 'sort',
'my_sort_in_place' => 'sort_in_place',
'my_splice' => 'splice',
'my_sum' => 'sum',
'my_tail' => 'tail',
'my_uniq' => 'uniq',
'my_uniq_in_place' => 'uniq_in_place',
'my_uniqnum' => 'uniqnum',
'my_uniqnum_in_place' => 'uniqnum_in_place',
'my_uniqstr' => 'uniqstr',
'my_uniqstr_in_place' => 'uniqstr_in_place',
'my_unshift' => 'unshift',
},
);
}
DESCRIPTION
This is a library of methods for Sub::HandlesVia.
DELEGATABLE METHODS
"accessor( $index, $value? )"
Arguments: Int, Optional[Any].
Acts like "get" if given one argument, or "set" if given two arguments.
my $object = My::Class->new( attr => [ 'foo', 'bar', 'baz' ] );
$object->my_accessor( 1, 'quux' );
say Dumper( $object->attr ); ## ==> [ 'foo', 'quux', 'baz' ]
say $object->my_accessor( 2 ); ## ==> 'baz'
"all()"
All elements in the array, in list context.
my $object = My::Class->new( attr => [ 'foo', 'bar' ] );
my @list = $object->my_all;
"all_true( $coderef )"
Arguments: CodeRef.
Like "List::Util::all()".
"any( $coderef )"
Arguments: CodeRef.
Like "List::Util::any()".
"apply( $coderef )"
Arguments: CodeRef.
Executes the coderef (which should modify $_) against each element of the array; returns
the resulting array in list context.
"clear()"
Empties the array.
my $object = My::Class->new( attr => [ 'foo' ] );
$object->my_clear;
say Dumper( $object->attr ); ## ==> []
"count()"
The number of elements in the referenced array.
my $object = My::Class->new( attr => [ 'foo', 'bar' ] );
say $object->my_count; ## ==> 2
"delete( $index )"
Arguments: Int.
Removes the indexed element from the array and returns it. Elements after it will be
"moved up".
"elements()"
All elements in the array, in list context.
my $object = My::Class->new( attr => [ 'foo', 'bar' ] );
my @list = $object->my_elements;
"first( $coderef )"
Arguments: CodeRef.
Like "List::Util::first()".
"first_index( $coderef )"
Arguments: CodeRef.
Like "List::MoreUtils::first_index()".
"flatten()"
All elements in the array, in list context.
"flatten_deep( $depth? )"
Arguments: Optional[Int].
Flattens the arrayref into a list, including any nested arrayrefs.
"for_each( $coderef )"
Arguments: CodeRef.
Chainable method which executes the coderef on each element of the array. The coderef will
be passed two values: the element and its index.
my $object = My::Class->new( attr => [ 'foo', 'bar', 'baz' ] );
$object->my_for_each( sub { say "Item $_[1] is $_[0]." } );
"for_each_pair( $coderef )"
Arguments: CodeRef.
Chainable method which executes the coderef on each pair of elements in the array. The
coderef will be passed the two elements.
"get( $index )"
Arguments: Int.
Returns a single element from the array by index.
my $object = My::Class->new( attr => [ 'foo', 'bar', 'baz' ] );
say $object->my_get( 0 ); ## ==> 'foo'
say $object->my_get( 1 ); ## ==> 'bar'
say $object->my_get( -1 ); ## ==> 'baz'
"grep( $coderef )"
Arguments: CodeRef.
Like "grep" from perlfunc.
"head( $count )"
Arguments: Int.
Returns the first $count elements of the array in list context.
"insert( $index, $value )"
Arguments: Int, Any.
Inserts a value into the array with the given index. Elements after it will be "moved
down".
my $object = My::Class->new( attr => [ 'foo', 'bar', 'baz' ] );
$object->my_insert( 1, 'quux' );
say Dumper( $object->attr ); ## ==> [ 'foo', 'quux', 'bar', 'baz' ]
"is_empty()"
Boolean indicating if the referenced array is empty.
my $object = My::Class->new( attr => [ 'foo', 'bar' ] );
say $object->my_is_empty; ## ==> false
$object->_set_attr( [] );
say $object->my_is_empty; ## ==> true
"join( $with? )"
Arguments: Optional[Str].
Returns a string joining all the elements in the array; if $with is omitted, defaults to a
comma.
my $object = My::Class->new( attr => [ 'foo', 'bar', 'baz' ] );
say $object->my_join; ## ==> 'foo,bar,baz'
say $object->my_join( '|' ); ## ==> 'foo|bar|baz'
"map( $coderef )"
Arguments: CodeRef.
Like "map" from perlfunc.
"max()"
Like "List::Util::max()".
"maxstr()"
Like "List::Util::maxstr()".
"min()"
Like "List::Util::min()".
"minstr()"
Like "List::Util::minstr()".
"natatime( $n, $callback? )"
Arguments: Int, Optional[CodeRef].
Given just a number, returns an iterator which reads that many elements from the array at
a time. If also given a callback, calls the callback repeatedly with those values.
"not_all_true( $coderef )"
Arguments: CodeRef.
Like "List::Util::notall()".
"pairfirst( $coderef )"
Arguments: CodeRef.
Like "List::Util::pairfirst()".
"pairgrep( $coderef )"
Arguments: CodeRef.
Like "List::Util::pairgrep()".
"pairkeys()"
Like "List::Util::pairkeys()".
"pairmap( $coderef )"
Arguments: CodeRef.
Like "List::Util::pairmap()".
"pairs()"
Like "List::Util::pairs()".
"pairvalues()"
Like "List::Util::pairvalues()".
"pick_random( $count )"
Arguments: Optional[Int].
If no $count is given, returns one element of the array at random. If $count is given,
creates a new array with that many random elements from the original array (or fewer if
the original array is not long enough) and returns that as an arrayref or list depending
on context
"pop()"
Removes the last element from the array and returns it.
my $object = My::Class->new( attr => [ 'foo', 'bar', 'baz' ] );
say $object->my_pop; ## ==> 'baz'
say $object->my_pop; ## ==> 'bar'
say Dumper( $object->attr ); ## ==> [ 'foo' ]
"print( $fh?, $with? )"
Arguments: Optional[FileHandle], Optional[Str].
Prints a string joining all the elements in the array; if $fh is omitted, defaults to
STDOUT; if $with is omitted, defaults to a comma.
"product()"
Like "List::Util::product()".
"push( @values )"
Adds elements to the end of the array.
my $object = My::Class->new( attr => [ 'foo' ] );
$object->my_push( 'bar', 'baz' );
say Dumper( $object->attr ); ## ==> [ 'foo', 'bar', 'baz' ]
"reduce( $coderef )"
Arguments: CodeRef.
Like "List::Util::reduce()".
"reductions( $coderef )"
Arguments: CodeRef.
Like "List::Util::reductions()".
"reset()"
Resets the attribute to its default value, or an empty arrayref if it has no default.
my $object = My::Class->new( attr => [ 'foo', 'bar', 'baz' ] );
$object->my_reset;
say Dumper( $object->attr ); ## ==> []
"reverse()"
Returns the reversed array in list context.
"sample( $count )"
Arguments: Int.
Like "List::Util::sample()".
"set( $index, $value )"
Arguments: Int, Any.
Sets the element with the given index to the supplied value.
my $object = My::Class->new( attr => [ 'foo', 'bar', 'baz' ] );
$object->my_set( 1, 'quux' );
say Dumper( $object->attr ); ## ==> [ 'foo', 'quux', 'baz' ]
"shallow_clone()"
Creates a new arrayref with the same elements as the original.
"shift()"
Removes an element from the start of the array and returns it.
my $object = My::Class->new( attr => [ 'foo', 'bar', 'baz' ] );
say $object->my_shift; ## ==> 'foo'
say $object->my_shift; ## ==> 'bar'
say Dumper( $object->attr ); ## ==> [ 'baz' ]
"shuffle()"
Returns the array in a random order; can be called in list context or scalar context and
will return an arrayref in the latter case.
"shuffle_in_place()"
Rearranges the array in a random order, and changes the attribute to point to the new
order.
"sort( $coderef? )"
Arguments: Optional[CodeRef].
Like "sort" from perlfunc.
"sort_in_place( $coderef? )"
Arguments: Optional[CodeRef].
Like "sort" from perlfunc, but changes the attribute to point to the newly sorted array.
"splice( $index, $length, @values )"
Like "splice" from perlfunc.
"sum()"
Like "List::Util::sum0()".
"tail( $count )"
Arguments: Int.
Returns the last $count elements of the array in list context.
"uniq()"
Returns the array filtered to remove duplicates; can be called in list context or scalar
context and will return an arrayref in the latter case.
"uniq_in_place()"
Filters the array to remove duplicates, and changes the attribute to point to the filtered
array.
"uniqnum()"
Returns the array filtered to remove duplicates numerically; can be called in list context
or scalar context and will return an arrayref in the latter case.
"uniqnum_in_place()"
Filters the array to remove duplicates numerically, and changes the attribute to point to
the filtered array.
"uniqstr()"
Returns the array filtered to remove duplicates stringwise; can be called in list context
or scalar context and will return an arrayref in the latter case.
"uniqstr_in_place()"
Filters the array to remove duplicates stringwise, and changes the attribute to point to
the filtered array.
"unshift( @values )"
Adds an element to the start of the array.
my $object = My::Class->new( attr => [ 'foo' ] );
$object->my_unshift( 'bar', 'baz' );
say Dumper( $object->attr ); ## ==> [ 'bar', 'baz', 'foo' ]
EXTENDED EXAMPLES
Using for_each
use strict;
use warnings;
package My::Plugin {
use Moo::Role;
sub initialize {}
sub finalize {}
}
package My::Processor {
use Moo;
use Sub::HandlesVia;
use Types::Standard qw( ArrayRef ConsumerOf );
has plugins => (
is => 'ro',
isa => ArrayRef[ ConsumerOf['My::Plugin'] ],
handles_via => 'Array',
handles => {
add_plugin => 'push',
plugin_do => 'for_each',
},
default => sub { [] },
);
sub _do_stuff {
return;
}
sub run_process {
my ( $self, @args ) = @_;
$self->plugin_do( sub {
my $plugin = shift;
$plugin->initialize( $self, @args );
} );
$self->_do_stuff( @args );
$self->plugin_do( sub {
my $plugin = shift;
$plugin->finalize( $self, @args );
} );
}
}
my $p = My::Processor->new();
package My::Plugin::Noisy {
use Moo; with 'My::Plugin';
sub initialize {
my ( $self, $processor, @args ) = @_;
say "initialize @args"; ## ==> 'initialize 1 2 3'
}
sub finalize {
my ( $self, $processor, @args ) = @_;
say "finalize @args"; ## ==> 'finalize 1 2 3'
}
}
$p->add_plugin( My::Plugin::Noisy->new );
$p->run_process( 1, 2, 3 );
Job queue using push and shift
use strict;
use warnings;
use Try::Tiny;
package My::JobQueue {
use Moo;
use Sub::HandlesVia;
use Types::Standard qw( Bool ArrayRef CodeRef HasMethods is_Object );
use Try::Tiny;
has auto_requeue => (
is => 'ro',
isa => Bool,
default => 0,
);
has jobs => (
is => 'ro',
isa => ArrayRef[ CodeRef | HasMethods['run'] ],
handles_via => 'Array',
handles => {
add_job => 'push',
_get_job => 'shift',
is_empty => 'is_empty',
},
default => sub { [] },
);
sub _handle_failed_job {
my ( $self, $job ) = @_;
$self->add_job( $job ) if $self->auto_requeue;
}
sub run_jobs {
my $self = shift;
while ( not $self->is_empty ) {
my $job = $self->_get_job;
try {
is_Object($job) ? $job->run() : $job->();
}
catch {
$self->_handle_failed_job( $job );
};
}
}
}
my $q = My::JobQueue->new();
my $str = '';
$q->add_job( sub { $str .= 'A' } );
$q->add_job( sub { $str .= 'B' } );
$q->add_job( sub { $str .= 'C' } );
$q->run_jobs;
say $str; ## ==> 'ABC'
# Attempt to push invalid value on the queue
#
try {
$q->add_job( "jobs cannot be strings" );
}
catch {
say $q->is_empty; ## ==> true
};
BUGS
Please report any bugs to <https://github.com/tobyink/p5-sub-handlesvia/issues>.
SEE ALSO
Sub::HandlesVia.
AUTHOR
Toby Inkster <tobyink@cpan.org>.
COPYRIGHT AND LICENCE
This software is copyright (c) 2020, 2022 by Toby Inkster.
This is free software; you can redistribute it and/or modify it under the same terms as
the Perl 5 programming language system itself.
DISCLAIMER OF WARRANTIES
THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
PURPOSE.