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

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