Benchmark-Perl-Formance-Cargo
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share/PerlCritic/Critic/Policy/Variables/RequireLexicalLoopIterators.pm view on Meta::CPAN
my $potential_scope = $elem->schild($start + 1);
return if not $potential_scope;
return if $potential_scope->isa('PPI::Structure::List');
return if $potential_scope eq 'my';
return $self->violation( $DESC, $EXPL, $elem );
}
#-----------------------------------------------------------------------------
1;
__END__
#-----------------------------------------------------------------------------
=pod
=head1 NAME
Perl::Critic::Policy::Variables::RequireLexicalLoopIterators - Write C<for my $element (@list) {...}> instead of C<for $element (@list) {...}>.
=head1 AFFILIATION
This Policy is part of the core L<Perl::Critic|Perl::Critic>
distribution.
=head1 DESCRIPTION
C<for>/C<foreach> loops I<always> create new lexical variables for
named iterators. In other words
for $zed (...) {
...
}
is equivalent to
for my $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 C<$bicycle> outside the loop is different from the
C<$bicycle> inside the loop. You may have freed your bicycle, but you
can't remember which one it was.
=head1 CONFIGURATION
This Policy is not configurable except for the standard options.
=head1 AUTHOR
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>
=head1 COPYRIGHT
Copyright (c) 2005-2010 Imaginative Software Systems. All rights reserved.
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.
=cut
# Local Variables:
# mode: cperl
# cperl-indent-level: 4
# fill-column: 78
# indent-tabs-mode: nil
# c-indentation-style: bsd
# End:
# ex: set ts=8 sts=4 sw=4 tw=78 ft=perl expandtab shiftround :
( run in 0.453 second using v1.01-cache-2.11-cpan-e93a5daba3e )