Acme-CPANModules-PickingRandomItemsFromList
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NAME
Acme::CPANModules::PickingRandomItemsFromList - List of modules to pick
random items from a list
VERSION
This document describes version 0.006 of
Acme::CPANModules::PickingRandomItemsFromList (from Perl distribution
Acme-CPANModules-PickingRandomItemsFromList), released on 2025-05-22.
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.
Tangentially-related modules
App::PickArgs provides CLI pick-args to pick random items from
command-line arguments.
ACME::CPANMODULES ENTRIES
List::Util
Author: PEVANS <https://metacpan.org/author/PEVANS>
List::MoreUtils
Author: REHSACK <https://metacpan.org/author/REHSACK>
Array::Sample::WeightedRandom
Author: PERLANCAR <https://metacpan.org/author/PERLANCAR>
Random::Skew
Author: TRILLICH <https://metacpan.org/author/TRILLICH>
Data::Random::Weighted
Author: GEISTBERG <https://metacpan.org/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-PickingRandomItemsFromLis
t>.
SOURCE
Source repository is at
<https://github.com/perlancar/perl-Acme-CPANModules-PickingRandomItemsFr
omList>.
SEE ALSO
Bencher::Scenario::SamplingFromList for the benchmark, which we will
probably include in the future.
Related lists: Acme::CPANModules::Sampling
Acme::CPANModules - about the Acme::CPANModules namespace
cpanmodules - CLI tool to let you browse/view the lists
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 software is copyright (c) 2025 by perlancar <perlancar@cpan.org>.
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-Pick
ingRandomItemsFromList>
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.
( run in 0.910 second using v1.01-cache-2.11-cpan-f56aa216473 )