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Data-Unixish-1.573
River stage two • 9 direct dependents • 51 total dependents
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/ Data::Unixish::cond

NAME

Data::Unixish::cond - Apply dux function conditionally

VERSION

This document describes version 1.573 of Data::Unixish::cond (from Perl distribution Data-Unixish), released on 2023-09-23.

SYNOPSIS

In Perl:

 use Data::Unixish qw(lduxl);
 my @res = lduxl([cond => {if => sub { $. % 2 }, then=>'uc', else=>'lc'}], "i", "love", "perl", "and", "c");
 # => ("i", "LOVE", "perl", "AND", "c")

In command-line:

 % echo -e "i\nlove\nperl\nand\nc" | dux cond --if '$. % 2' --then uc --else lc
 i
 LOVE
 perl
 AND
 c

FUNCTIONS

cond

Usage:

 cond(%args) -> [$status_code, $reason, $payload, \%result_meta]

Apply dux function conditionally.

This dux function takes a condition (a Perl code/expression) and one or two other dux functions (A and B). Condition will be evaluated for each item (where $_ will be set to the current item). If condition evaluates to true, then A is applied to the item, else B. All the dux functions must be itemfunc.

This function is not exported.

Arguments ('*' denotes required arguments):

  • else => str|array

    dux function to be applied if condition is false.

  • if* => str|code

    Perl code that specifies the condition.

  • in => array

    Input stream (e.g. array or filehandle).

  • out => any

    Output stream (e.g. array or filehandle).

  • then* => str|array

    dux function to be applied if condition is true.

Returns an enveloped result (an array).

First element ($status_code) is an integer containing HTTP-like status code (200 means OK, 4xx caller error, 5xx function error). Second element ($reason) is a string containing error message, or something like "OK" if status is 200. Third element ($payload) is the actual result, but usually not present when enveloped result is an error response ($status_code is not 2xx). Fourth element (%result_meta) is called result metadata and is optional, a hash that contains extra information, much like how HTTP response headers provide additional metadata.

Return value: (any)

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/Data-Unixish.

SOURCE

Source repository is at https://github.com/perlancar/perl-Data-Unixish.

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) 2023, 2019, 2017, 2016, 2015, 2014, 2013, 2012 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=Data-Unixish

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.