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Perl::Critic::PolicPerUserrContributedyPerliDocumentation::ProhibitVoidGrep(3)

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 v5.24.1	   Perl::Critic::Policy::BuiltinFunctions::ProhibitVoidGrep(3)

NAME | AFFILIATION | DESCRIPTION | CONFIGURATION | AUTHOR | COPYRIGHT

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