12-05-2013
Hi ,
Preferred instances is still coming as empty.How to display PREFERRED now by matching PREF pattern and also I want to put this whole string to a variable which would contain both preferred and available instances and later on want to segregate preferred and available from that variable and assign that to 2 variables one for preferred and other for available
Best regards,
Vishal
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LEARN ABOUT CENTOS
perl::critic::policy::variables::requirenegativeindices
Perl::Critic::Policy::Variables::RequireNegativeIndices(User Contributed Perl DocumentatPerl::Critic::Policy::Variables::RequireNegativeIndices(3)
NAME
Perl::Critic::Policy::Variables::RequireNegativeIndices - Negative array index should be used.
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
Perl treats a negative array subscript as an offset from the end. Given this, the preferred way to get the last element is $x[-1], not
$x[$#x] or $x[@x-1], and the preferred way to get the next-to-last is $x[-2], not "$x[$#x-1" or $x[@x-2].
The biggest argument against the non-preferred forms is that their semantics change when the computed index becomes negative. If @x
contains at least two elements, $x[$#x-1] and $x[@x-2] are equivalent to $x[-2]. But if it contains a single element, $x[$#x-1] and
$x[@x-2] are both equivalent to $x[-1]. Simply put, the preferred form is more likely to do what you actually want.
As Conway points out, the preferred forms also perform better, are more readable, and are easier to maintain.
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 v5.16.3 2014-06-09 Perl::Critic::Policy::Variables::RequireNegativeIndices(3)