NAME

Acme::CPANModules::PickingRandomItemsFromList - Picking random items from a list

VERSION

This document describes version 0.004 of Acme::CPANModules::PickingRandomItemsFromList (from Perl distribution Acme-CPANModules-PickingRandomItemsFromList), released on 2023-06-20.

DESCRIPTION

If you are picking random lines from a file, there's a separate CPANModules list for it: Acme::CPANModules::PickingRandomLinesFromFile.

1. Picking a single item, with equal probability

If you only want to pick a single item, with equal probability, you can simply get a random element from an array using the $ary[rand @ary] idiom.

2. Picking multiple items, with equal probability

2a. Picking multiple items, with equal probability, duplicates allowed

If you want to allow duplicates, you can repeatedly pick random elements from an array using the $ary[rand @ary] idiom.

2b. Picking multiple items, with equal probability, duplicates not allowed

If you do not want to allow duplicates, there are several alternatives:

List::Util (from version 1.54, 2020-02-02) provides sample(). If you use an older version, you can use shuffle() then get as many number of samples as you need from the first elements of the array using slice (@shuffled[0..$num_wanted-1]) or head().

List::MoreUtils also provides samples().

Keywords: sample, sampling.

3. Picking item(s), with weights

If you want to assign different weights to different items (so one item might be picked more likely), you can use one of these modules:

Array::Sample::WeightedRandom offers sampling without replacement (not allowing duplicates) or with replacement (allowing duplicates).

Random::Skew.

Data::Random::Weighted currently can only pick a single item.

ACME::CPANMODULES ENTRIES

List::Util: Author: PEVANS
List::MoreUtils: Author: REHSACK
Array::Sample::WeightedRandom: Author: PERLANCAR
Random::Skew
Data::Random::Weighted: Author: GEISTBERG

FAQ

What is an Acme::CPANModules::* module?

An Acme::CPANModules::* module, like this module, contains just a list of module names that share a common characteristics. It is a way to categorize modules and document CPAN. See Acme::CPANModules for more details.

What are ways to use this Acme::CPANModules module?

Aside from reading this Acme::CPANModules module's POD documentation, you can install all the listed modules (entries) using cpanm-cpanmodules script (from App::cpanm::cpanmodules distribution):

% cpanm-cpanmodules -n PickingRandomItemsFromList

Alternatively you can use the cpanmodules CLI (from App::cpanmodules distribution):

% cpanmodules ls-entries PickingRandomItemsFromList | cpanm -n

or Acme::CM::Get:

% perl -MAcme::CM::Get=PickingRandomItemsFromList -E'say $_->{module} for @{ $LIST->{entries} }' | cpanm -n

or directly:

% perl -MAcme::CPANModules::PickingRandomItemsFromList -E'say $_->{module} for @{ $Acme::CPANModules::PickingRandomItemsFromList::LIST->{entries} }' | cpanm -n

This Acme::CPANModules module also helps lcpan produce a more meaningful result for lcpan related-mods command when it comes to finding related modules for the modules listed in this Acme::CPANModules module. See App::lcpan::Cmd::related_mods for more details on how "related modules" are found.

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/Acme-CPANModules-PickingRandomItemsFromList.

SOURCE

Source repository is at https://github.com/perlancar/perl-Acme-CPANModules-PickingRandomItemsFromList.

AUTHOR

perlancar <perlancar@cpan.org>

CONTRIBUTING

To contribute, you can send patches by email/via RT, or send pull requests on GitHub.

Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:

% prove -l

If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps required beyond that are considered a bug and can be reported to me.

COPYRIGHT AND LICENSE

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=Acme-CPANModules-PickingRandomItemsFromList

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

To install Acme::CPANModules::PickingRandomItemsFromList, copy and paste the appropriate command in to your terminal.

cpanm

cpanm Acme::CPANModules::PickingRandomItemsFromList

CPAN shell

perl -MCPAN -e shell
install Acme::CPANModules::PickingRandomItemsFromList

For more information on module installation, please visit the detailed CPAN module installation guide.

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