NAME List::Util::sglice - Remove some elements where code returns true VERSION This document describes version 0.001 of List::Util::sglice (from Perl distribution List-Util-sglice), released on 2023-09-18. SYNOPSIS use List::Util::sglice qw(sglice); my @ary = (1,2,3,4,5,6,7,8,9,10); # 1. remove all even numbers (equivalent to: @ary = grep { !($_ % 2 == 0) } @ary # --------------------------- 1st param: code to match elements to remove # / ---------------------- 2nd param: the array # / / -------------------- 3rd param: (optional) how many matching elems to remove, undef means all, negative allowed to mean last N matching elems # / / / sglice { $_ % 2 == 0 ? () : ($_) } @ary ; # => (1,3,5,7,9) # 3. remove first two even numbers sglice { $_ % 2 == 0 ? () : ($_) } @ary, 2; # => (1,3,5,6,7,8,9,10) # 4. remove last two even numbers sglice { $_ % 2 == 0 ? () : ($_) } @ary, -2; # => (1,2,3,4,5,6,7,9) # 5. remove elements #0..#2, equivalent to: splice @ary, 0, 2 sglice { $_[1] <= 2 ? () : ($_) } @ary; # => (4,5,6,7,8,9,10) # 6. put even numbers to the beginning of array unshift @ary, sglice { $_ % 2 == 0 } @ary; # => (2,4,6,8,10, 1,3,5,7,9) DESCRIPTION This module provides "sglice". FUNCTIONS Not exported by default but exportable. sglice Usage: sglice CODE ARRAY, NUM_TO_REMOVE sglice CODE ARRAY "sglice" (mnemonic: "g" is for *grep*) somewhat resembles "splice". Instead of specifying offset and number of elements to remove from "ARRAY", you specify "CODE" to match elements to remove. Unlike "splice", "sglice" does not let you reinsert new items (see List::Util::msplice for that). In CODE, $_ (as well as $_[0]) is set to array element. $_[1] is set to the index of the element, so you can still remove elements by their position. The third parameter, "NUM_TO_REMOVE", is the number of elements to remove. If unspecified, all matching elements will be removed. You can also specify negative integer to remove NUM last matching elements. Setting this to 0 effectively means a no-op. In list context, the function returns the removed elements. In scalar context, it returns the last removed elements. HOMEPAGE Please visit the project's homepage at <https://metacpan.org/release/List-Util-sglice>. SOURCE Source repository is at <https://github.com/perlancar/perl-List-Util-sglice>. SEE ALSO List::Util::mapsplice. "splice" in perlfunc. 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 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=List-Util-sglice> 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.