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Perl::Critic::Policy::BuiltinFuUseroCoPerl::Critic::Policy::BuiltinFunctions::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 v5.16.3			      Perl::Critic::Policy::BuiltinFunctions::ProhibitVoidGrep(3)
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