1Sub::HandlesVia::HandleUrsLeirbrCaornyt:r:iHbausthe(d3S)Puebr:l:HDaoncdulmeesnVtiaat:i:oHnandlerLibrary::Hash(3)
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NAME

6       Sub::HandlesVia::HandlerLibrary::Hash - library of hash-related methods
7

SYNOPSIS

9         package My::Class {
10           use Moo;
11           use Sub::HandlesVia;
12           use Types::Standard 'HashRef';
13           has attr => (
14             is => 'rwp',
15             isa => HashRef,
16             handles_via => 'Hash',
17             handles => {
18               'my_accessor' => 'accessor',
19               'my_all' => 'all',
20               'my_clear' => 'clear',
21               'my_count' => 'count',
22               'my_defined' => 'defined',
23               'my_delete' => 'delete',
24               'my_delete_where' => 'delete_where',
25               'my_elements' => 'elements',
26               'my_exists' => 'exists',
27               'my_for_each_key' => 'for_each_key',
28               'my_for_each_pair' => 'for_each_pair',
29               'my_for_each_value' => 'for_each_value',
30               'my_get' => 'get',
31               'my_is_empty' => 'is_empty',
32               'my_keys' => 'keys',
33               'my_kv' => 'kv',
34               'my_reset' => 'reset',
35               'my_set' => 'set',
36               'my_shallow_clone' => 'shallow_clone',
37               'my_sorted_keys' => 'sorted_keys',
38               'my_values' => 'values',
39             },
40           );
41         }
42

DESCRIPTION

44       This is a library of methods for Sub::HandlesVia.
45

DELEGATABLE METHODS

47   "accessor( $key, $value? )"
48       Arguments: Str, Optional[Any].
49
50       Acts like "get" if given just a key, or "set" if given a key and a
51       value.
52
53   "all()"
54       Returns the hash in list context.
55
56         my $object = My::Class->new( attr => { foo => 0, bar => 1 } );
57         my %hash = $object->my_all;
58
59   "clear()"
60       Empties the hash.
61
62         my $object = My::Class->new( attr => { foo => 0, bar => 1 } );
63         $object->my_clear;
64         say exists $object->attr->{foo}; ## ==> false
65         say exists $object->attr->{bar}; ## ==> false
66
67   "count()"
68       Returns the number of keys in the hash.
69
70         my $object = My::Class->new( attr => { foo => 0, bar => 1 } );
71         say $object->my_count; ## ==> 2
72
73   "defined( $key )"
74       Arguments: Str.
75
76       Indicates whether a value exists and is defined in the hashref by its
77       key.
78
79         my $object = My::Class->new( attr => { foo => 0, bar => 1 } );
80         say $object->my_defined( 'foo' ); ## ==> 1
81
82   "delete( $key )"
83       Removes a value from the hashref by its key.
84
85         my $object = My::Class->new( attr => { foo => 0, bar => 1 } );
86         $object->my_delete( 'foo' );
87         say exists $object->attr->{foo}; ## ==> false
88
89   "delete_where( $match )"
90       Arguments: CodeRef|RegexpRef.
91
92       Removes values from the hashref by matching keys against a coderef or
93       regexp.
94
95         my $object = My::Class->new( attr => { foo => 0, bar => 1, baz => 2 } );
96         $object->my_delete_where( sub { $_ eq 'foo' or $_ eq 'bar' } );
97         say Dumper( $object->attr ); ## ==> { baz => 2 }
98
99         my $object2 = My::Class->new( attr => { foo => 0, bar => 1, baz => 2 } );
100         $object2->my_delete_where( qr/^b/ );
101         say Dumper( $object2->attr ); ## ==> { foo => 0 }
102
103   "elements()"
104       Returns the hash in list context.
105
106         my $object = My::Class->new( attr => { foo => 0, bar => 1 } );
107         my %hash = $object->my_elements;
108
109   "exists( $key )"
110       Arguments: Str.
111
112       Indicates whether a value exists in the hashref by its key.
113
114         my $object = My::Class->new( attr => { foo => 0, bar => 1 } );
115         say $object->my_exists( 'foo' ); ## ==> true
116         say $object->my_exists( 'baz' ); ## ==> false
117
118   "for_each_key( $coderef )"
119       Arguments: CodeRef.
120
121       Chainable method which calls the coderef for each key in the hash,
122       passing just the key to the coderef.
123
124   "for_each_pair( $coderef )"
125       Arguments: CodeRef.
126
127       Chainable method which calls the coderef for each key in the hash,
128       passing the key and value to the coderef.
129
130   "for_each_value( $coderef )"
131       Arguments: CodeRef.
132
133       Chainable method which calls the coderef for each value in the hash,
134       passing just the value to the coderef.
135
136   "get( $key )"
137       Returns a value from the hashref by its key.
138
139         my $object = My::Class->new( attr => { foo => 0, bar => 1 } );
140         say $object->my_get( 'bar' ); ## ==> 1
141
142   "is_empty()"
143       Returns true iff there are no keys in the hash.
144
145         my $object = My::Class->new( attr => { foo => 0, bar => 1 } );
146         say $object->my_is_empty; ## ==> false
147         $object->_set_attr( {} );
148         say $object->my_is_empty; ## ==> true
149
150   "keys()"
151       Returns the list of keys in the hash.
152
153         my $object = My::Class->new( attr => { foo => 0, bar => 1 } );
154         # says 'foo' and 'bar' in an unpredictable order
155         say for $object->my_keys;
156
157   "kv()"
158       Returns a list of arrayrefs, where each arrayref is a key-value pair.
159
160   "reset()"
161       Resets the attribute to its default value, or an empty hashref if it
162       has no default.
163
164   "set( $key, $value, ... )"
165       Given a key and value, adds the key to the hashref with the given
166       value.
167
168         my $object = My::Class->new( attr => { foo => 0, bar => 1 } );
169         $object->my_set( bar => 2, baz => 1 );
170         say $object->attr->{foo}; ## ==> 0
171         say $object->attr->{baz}; ## ==> 1
172         say $object->attr->{bar}; ## ==> 2
173
174   "shallow_clone()"
175       Creates a new hashref with the same keys and values as the original.
176
177   "sorted_keys()"
178       Returns an alphabetically sorted list of keys in the hash.
179
180         my $object = My::Class->new( attr => { foo => 0, bar => 1 } );
181         # says 'bar' then 'foo'
182         say for $object->my_sorted_keys;
183
184   "values()"
185       Returns the list of values in the hash.
186
187         my $object = My::Class->new( attr => { foo => 0, bar => 1 } );
188         # says '0' and '1' in an unpredictable order
189         say for $object->my_values;
190

BUGS

192       Please report any bugs to
193       <https://github.com/tobyink/p5-sub-handlesvia/issues>.
194

SEE ALSO

196       Sub::HandlesVia.
197

AUTHOR

199       Toby Inkster <tobyink@cpan.org>.
200

202       This software is copyright (c) 2020, 2022 by Toby Inkster.
203
204       This is free software; you can redistribute it and/or modify it under
205       the same terms as the Perl 5 programming language system itself.
206

DISCLAIMER OF WARRANTIES

208       THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
209       WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
210       MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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214perl v5.36.0                      2022-S1u2b-:1:7HandlesVia::HandlerLibrary::Hash(3)
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