Perl::Critic::PolicyPerl::Critic::Policy::Variables::RequireNegativeIndices(3)NAMEPerl::Critic::Policy::Variables::RequireNegativeIndices - Negative
array index should be used.
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
Conway points out that
$arr[$#arr];
$arr[$#arr-1];
$arr[@arr-1];
$arr[@arr-2];
are equivalent to
$arr[-1];
$arr[-2];
$arr[-1];
$arr[-2];
and the latter are more readable, performant and maintainable. The
latter is because the programmer no longer needs to keep two variable
names matched.
This policy notices all of the simple forms of the above problem, but
does not recognize any of these more complex examples:
$some->[$data_structure]->[$#{$some->[$data_structure]} -1];
my $ref = \@arr;
$ref->[$#arr];
CONFIGURATION
This Policy is not configurable except for the standard options.
AUTHOR
Chris Dolan <cdolan@cpan.org>
COPYRIGHT
Copyright (c) 2006-2011 Chris Dolan.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
perl v5.14.1Perl::Critic::Policy::Variables::RequireNegativeIndices(3)
