/ 
Hydrogen-0.020000
River stage zero No dependents
/ Hydrogen

NAME

Hydrogen - utilities for the simplest elements of Perl

SYNOPSIS

Normal version of the function:

use feature 'say';
use Hydrogen::HashRef { prefix => 'hhr_' }, qw( get set );

my %hash;
hhr_set( \%hash, Alice => 123 );
hhr_set( \%hash, Bob   => 456 );

say $hash{Alice};                ## ==> 123
say hhr_get( \%hash, 'Bob' );    ## ==> 456

Version of the function which uses prototypes:

use feature 'say';
use Hydrogen::Hash { prefix => 'hh_' }, qw( get set );

my %hash;
hh_set( %hash, Alice => 123 );
hh_set( %hash, Bob   => 456 );

say $hash{Alice};                ## ==> 123
say hh_get( %hash, 'Bob' );      ## ==> 456

Currying:

use feature 'say';
use Hydrogen::Curry::HashRef qw( curry_get curry_set );

my %hash;
my $setter = curry_set( \%hash );
my $getter = curry_get( \%hash );

$setter->( Alice => 123 );
$setter->( Bob   => 456 );

say $hash{Alice};                ## ==> 123
say $getter->( 'Bob' );          ## ==> 456

Using the $_ topic variable:

use feature 'say';
use Hydrogen::Topic::HashRef qw( get set );

local $_ = {};

set( Alice => 123 );
set( Bob   => 456 );

say $_->{Alice};                 ## ==> 123
say get( 'Bob' );                ## ==> 456

DESCRIPTION

Hydrogen provides a standard library for doing really simple things in Perl. And I mean really simple things.

Things which are often Perl builtin functions, operators, and even just part of Perl syntax like accessing keys within hashes.

RATIONALE

Whydrogen?

You can make a coderef pointing to \&Hydrogen::Number::add but you can't make a coderef pointing to Perl's += operator!

If you are implementing a scripting language or DSL which needs to provide a standard library of builtin functions, then Hydrogen may be a good place to start.

THE HYDROGEN LIBRARY

Prototyped Functions

Curry Functions

Topicalized Functions

BONUS FUNCTIONS

Hydrogen uses the following functions internally, but they may also be useful to you.

Hydrogen::croak( $message, @args? )

Acts like croak from Carp, but if @args is provided, will sprintf first. If @args contains references, those will be dumped using Data::Dumper.

Hydrogen::fc( $string? )

Acts like CORE::fc if that function is available, and CORE::lc otherwise.

If no $string is provided, operates on $_.

DEPENDENCIES

Hydrogen requires Perl 5.8.1 or above.

Hydrogen requires the modules Carp, Data::Dumper, List::Util, and Scalar::Util, all of which normally come with Perl. Hydrogen needs at least version 1.54 of List::Util; Perl versions older than 5.32.0 will be distributed with older versions of List::Util, but upgrades to the module can be found on the CPAN.

Hydrogen also requires the module Exporter::Shiny which can be found on the CPAN.

Hydrogen's test suite requires the module Test2::V0 which can be found on the CPAN.

BUGS

Please report any bugs to http://github.com/tobyink/p5-hydrogen/issues.

SEE ALSO

This standard library is autogenerated from Sub::HandlesVia which provides the same functionality as methods which objects can delegate to attributes.

AUTHOR

Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

This software is copyright (c) 2022-2023 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.