03-11-2017
Hi Scrutinizer,
The point of the loop in this code seems to be to return data from the last line of text produced by the command named by c. Without the loop, the function returns the first line of text produced instead of the last. Neither form gathers more than one line of output.
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LEARN ABOUT CENTOS
perl::critic::policy::inputoutput::prohibitreadlineinforloop
Perl::Critic::Policy::InputOutput::ProhibitReadlineInForUser(Contributed Perl DocumPerl::Critic::Policy::InputOutput::ProhibitReadlineInForLoop(3)
NAME
Perl::Critic::Policy::InputOutput::ProhibitReadlineInForLoop - Write "while( $line = <> ){...}" instead of "for(<>){...}".
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
Using the readline operator in a "for" or "foreach" loop is very slow. The iteration list of the loop creates a list context, which causes
the readline operator to read the entire input stream before iteration even starts. Instead, just use a "while" loop, which only reads one
line at a time.
for my $line ( <$file_handle> ){ do_something($line) } #not ok
while ( my $line = <$file_handle> ){ do_something($line) } #ok
CONFIGURATION
This Policy is not configurable except for the standard options.
AUTHOR
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>
COPYRIGHT
Copyright (c) 2005-2011 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.
perl v5.16.3 2014-06-09 Perl::Critic::Policy::InputOutput::ProhibitReadlineInForLoop(3)