NAME

Data::Sah::Filter::perl::Array::check_uniq - Check that an array has unique elements, using List::Util's uniq()

VERSION

This document describes version 0.025 of Data::Sah::Filter::perl::Array::check_uniq (from Perl distribution Data-Sah-Filter), released on 2024-07-17.

SYNOPSIS

Using in Sah schema's "prefilters" (or "postfilters") clause

 ["array","prefilters",[["Array::check_uniq"]]]

Using with Data::Sah:

 use Data::Sah qw(gen_validator);
 
 my $schema = ["array","prefilters",[["Array::check_uniq"]]];
 my $validator = gen_validator($schema);
 if ($validator->($some_data)) { print 'Valid!' }

Using with Data::Sah:Filter directly:

 use Data::Sah::Filter qw(gen_filter);
 my $filter = gen_filter([["Array::check_uniq"]]);
 # $errmsg will be empty/undef when filtering succeeds
 my ($errmsg, $filtered_value) = $filter->($some_data);

Sample data and filtering results

 [] # valid, unchanged
 ["a","b"] # valid, unchanged
 ["a","b","a"] # INVALID (Array has duplicate element(s): "a"), becomes undef
 ["a","b","A"] # valid, unchanged (Use Array::check_uniqstr filter for case insensitivity option)
 [] # filtered with args {reverse=>1}, INVALID (Array does not have duplicate element(s)), becomes undef
 ["a","b"] # filtered with args {reverse=>1}, INVALID (Array does not have duplicate element(s)), becomes undef
 ["a","b","a"] # filtered with args {reverse=>1}, valid, unchanged
 ["a","b","A"] # filtered with args {reverse=>1}, INVALID (Array does not have duplicate element(s)), becomes undef (Use Array::check_uniqstr filter for case insensitivity option)

FAQ

How to check that array contains a duplicate?

Use the "reverse" argument and set it to 1.

HOMEPAGE

Please visit the project's homepage at <https://metacpan.org/release/Data-Sah-Filter>.

SOURCE

Source repository is at <https://github.com/perlancar/perl-Data-Sah-Filter>.

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=Data-Sah-Filter>

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.