debian man page for perl::critic::policy::inputoutput::prohibitreadlineinforloop

Query: perl::critic::policy::inputoutput::prohibitreadlineinforloop

OS: debian

Section: 3pm

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

Perl::Critic::Policy::InputOutput::ProhibitReadlineInForUser(Contributed Perl DocPerl::Critic::Policy::InputOutput::ProhibitReadlineInForLoop(3pm)

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 v5.14.2 2012-06-07 Perl::Critic::Policy::InputOutput::ProhibitReadlineInForLoop(3pm)
Related Man Pages
perl::critic::policy::inputoutput::prohibitreadlineinforloop(3) - centos
perl::critic::policy::builtinfunctions::requireblockgrep(3) - centos
perl::critic::policy::controlstructures::prohibituntilblocks(3) - centos
perl::critic::policy::inputoutput::prohibitbarewordfilehandles(3) - centos
perl::critic::policy::builtinfunctions::requireblockmap(3pm) - debian
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