Perl::Critic::Policy::Variables::RequireLexicalLoopIterators - Write "for my $element (@list) {...}"

       This Policy is part of the core Perl::Critic distribution.

       Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>

       This Policy is not configurable except for the standard options.

       Copyright (c) 2005-2023 Imaginative Software Systems

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself.  The full text of this license can be found in the LICENSE file included with this module.

perl v5.40.0                                       2024-10-28             Perl::Critic::P...alLoopIterators(3pm)

       This policy asks you to use "my"-style lexical loop iterator variables:

           foreach my $zed (...) {
               ...
           }

       Unless you use "my", "for"/"foreach" loops use a global variable with its value "local" to the block. In
       other words,

           foreach $zed (...) {
               ...
           }

       is more-or-less equivalent to

           {
               local $zed
               foreach $zed (...) {
                   ...
               }
           }

       This may not seem like a big deal until you see code like

           my $bicycle;
           for $bicycle (@things_attached_to_the_bike_rack) {
               if (
                       $bicycle->is_red()
                   and $bicycle->has_baseball_card_in_spokes()
                   and $bicycle->has_bent_kickstand()
               ) {
                   $bicycle->remove_lock();

                   last;
               }
           }

           if ( $bicycle and $bicycle->is_unlocked() ) {
               ride_home($bicycle);
           }

       which is not going to allow you to arrive in time for dinner with your family because the $bicycle
       outside the loop is not changed by the loop. You may have unlocked your bicycle, but you can't remember
       which one it was.

       Lexical loop variables were introduced in Perl 5.004. This policy does not report violations on code
       which explicitly specifies an earlier version of Perl (e.g. "require 5.002;").

       Perl::Critic::Policy::Variables::RequireLexicalLoopIterators - Write "for my $element (@list) {...}"
       instead of "for $element (@list) {...}".

       "Foreach Loops" in perlsyn

       "my() in Control Structures" in perl5004delta