debian man page for perl::critic::policy::builtinfunctions::prohibitvoidgrep

Query: perl::critic::policy::builtinfunctions::prohibitvoidgrep

OS: debian

Section: 3pm

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

Perl::Critic::Policy::BuiltinFunctions::ProhibitVoidGrepUser)Contributed Perl DocumenPerl::Critic::Policy::BuiltinFunctions::ProhibitVoidGrep(3pm)

NAME
Perl::Critic::Policy::BuiltinFunctions::ProhibitVoidGrep - Don't use "grep" in void contexts.
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
"map" and "grep" are intended to be pure functions, not mutators. If you want to iterate with side-effects, then you should use a proper "for" or "foreach" loop. grep{ print frobulate($_) } @list; #not ok print map{ frobulate($_) } @list; #ok grep{ $_ = lc $_ } @list; #not ok for( @list ){ $_ = lc $_ }; #ok map{ push @frobbed, frobulate($_) } @list; #not ok @frobbed = map { frobulate($_) } @list; #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::BuiltinFunctions::ProhibitVoidGrep(3pm)
Related Man Pages
perl::critic::policy::builtinfunctions::requireblockmap(3) - centos
perl::critic::policy::builtinfunctions::prohibitvoidgrep(3) - centos
perl::critic::policy::builtinfunctions::prohibitsleepviaselect(3pm) - debian
perl::critic::policy::builtinfunctions::prohibitvoidmap(3pm) - debian
perl::critic::policy::controlstructures::prohibitunlessblocks(3pm) - debian
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