Moose::Meta::Attribute::Native::Trait::Array - Helper trait for ArrayRef attributes
version 2.2206
package Stuff; use Moose; has 'options' => ( traits => ['Array'], is => 'ro', isa => 'ArrayRef[Str]', default => sub { [] }, handles => { all_options => 'elements', add_option => 'push', map_options => 'map', filter_options => 'grep', find_option => 'first', get_option => 'get', join_options => 'join', count_options => 'count', has_options => 'count', has_no_options => 'is_empty', sorted_options => 'sort', }, ); no Moose; 1;
This trait provides native delegation methods for array references.
If you don't provide an isa value for your attribute, it will default to ArrayRef.
isa
ArrayRef
count
Returns the number of elements in the array.
$stuff = Stuff->new; $stuff->options( [ "foo", "bar", "baz", "boo" ] ); print $stuff->count_options; # prints 4
This method does not accept any arguments.
is_empty
Returns a boolean value that is true when the array has no elements.
$stuff->has_no_options ? die "No options!\n" : print "Good boy.\n";
elements
In list context, returns all of the elements of the array as a list.
In scalar context, returns the number of elements in the array.
my @options = $stuff->all_options; print "@options"; # prints "foo bar baz boo" print scalar $stuff->all_options; # prints 4
get($index)
Returns an element of the array by its index. You can also use negative index numbers, just as with Perl's core array handling.
my $option = $stuff->get_option(1); print "$option\n"; # prints "bar"
If the specified element does not exist, this will return undef.
undef
This method accepts just one argument.
pop
Just like Perl's builtin pop.
push($value1, $value2, value3 ...)
Just like Perl's builtin push. Returns the number of elements in the new array.
push
This method accepts any number of arguments.
shift
Just like Perl's builtin shift.
unshift($value1, $value2, value3 ...)
Just like Perl's builtin unshift. Returns the number of elements in the new array.
unshift
splice($offset, $length, @values)
Just like Perl's builtin splice. In scalar context, this returns the last element removed, or undef if no elements were removed. In list context, this returns all the elements removed from the array.
splice
This method requires at least one argument.
first( sub { ... } )
This method returns the first matching item in the array, just like List::Util's first function. The matching is done with a subroutine reference you pass to this method. The subroutine will be called against each element in the array until one matches or all elements have been checked. Each list element will be available to the sub in $_.
first
$_
my $found = $stuff->find_option( sub {/^b/} ); print "$found\n"; # prints "bar"
This method requires a single argument.
first_index( sub { ... } )
This method returns the index of the first matching item in the array, just like "first_index" in List::SomeUtils. The matching is done with a subroutine reference you pass to this method. The subroutine will be called against each element in the array until one matches or all elements have been checked. Each list element will be available to the sub in $_. If no match is made, -1 is returned.
grep( sub { ... } )
This method returns every element matching a given criteria, just like Perl's core grep function. This method requires a subroutine which implements the matching logic; each list element will be available to the sub in $_.
grep
my @found = $stuff->filter_options( sub {/^b/} ); print "@found\n"; # prints "bar baz boo"
map( sub { ... } )
This method transforms every element in the array and returns a new array, just like Perl's core map function. This method requires a subroutine which implements the transformation; each list element will be available to the sub in $_.
map
my @mod_options = $stuff->map_options( sub { $_ . "-tag" } ); print "@mod_options\n"; # prints "foo-tag bar-tag baz-tag boo-tag"
reduce( sub { ... } )
This method turns an array into a single value, by passing a function the value so far and the next value in the array, just like List::Util's reduce function. The reducing is done with a subroutine reference you pass to this method; each list element will be available to the sub in $_.
reduce
my $found = $stuff->reduce_options( sub { $_[0] . $_[1] } ); print "$found\n"; # prints "foobarbazboo"
sort
sort( sub { ... } )
Returns the elements of the array (not an array reference) in sorted order, or, like elements, returns the number of elements in the array in scalar context.
You can provide an optional subroutine reference to sort with (as you can with Perl's core sort function). However, instead of using $a and $b in this subroutine, you will need to use $_[0] and $_[1].
$a
$b
$_[0]
$_[1]
# 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"
This method accepts a single argument.
sort_in_place
sort_in_place( sub { ... } )
Sorts the array in place, modifying the value of the attribute.
You can provide an optional subroutine reference to sort with (as you can with Perl's core sort function). However, instead of using $a and $b, you will need to use $_[0] and $_[1] instead.
This method does not define a return value.
shuffle
Returns the elements of the array in random order, like shuffle from List::Util.
uniq
Returns the array with all duplicate elements removed, like "uniq" in List::Util.
join($str)
Joins every element of the array using the separator given as argument, just like Perl's core join function.
join
my $joined = $stuff->join_options(':'); print "$joined\n"; # prints "foo:bar:baz:boo"
set($index, $value)
Given an index and a value, sets the specified array element's value.
This method returns the value at $index after the set.
$index
This method requires two arguments.
delete($index)
Removes the element at the given index from the array.
This method returns the deleted value. Note that if no value exists, it will return undef.
This method requires one argument.
insert($index, $value)
Inserts a new element into the array at the given index.
This method returns the new value at $index.
clear
Empties the entire array, like @array = ().
@array = ()
accessor($index)
accessor($index, $value)
This method provides a get/set accessor for the array, based on array indexes. If passed one argument, it returns the value at the specified index. If passed two arguments, it sets the value of the specified index.
When called as a setter, this method returns the new value at $index.
This method accepts one or two arguments.
natatime($n)
natatime($n, $code)
This method returns an iterator which, on each call, returns $n more items from the array, in order, like "natatime" in List::SomeUtils.
$n
If you pass a coderef as the second argument, then this code ref will be called on each group of $n elements in the array until the array is exhausted.
shallow_clone
This method returns a shallow clone of the array reference. The return value is a reference to a new array with the same elements. It is shallow because any elements that were references in the original will be the same references in the clone.
See "BUGS" in Moose for details on reporting bugs.
Stevan Little <stevan@cpan.org>
Dave Rolsky <autarch@urth.org>
Jesse Luehrs <doy@cpan.org>
Shawn M Moore <sartak@cpan.org>
יובל קוג'מן (Yuval Kogman) <nothingmuch@woobling.org>
Karen Etheridge <ether@cpan.org>
Florian Ragwitz <rafl@debian.org>
Hans Dieter Pearcey <hdp@cpan.org>
Chris Prather <chris@prather.org>
Matt S Trout <mstrout@cpan.org>
This software is copyright (c) 2006 by 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.
To install Moose, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Moose
CPAN shell
perl -MCPAN -e shell install Moose
For more information on module installation, please visit the detailed CPAN module installation guide.