Perl::Critic::Policy::BuiltinFunctions::ProhibitVoidGrep - Don't use grep in void contexts.
This Policy is part of the core Perl::Critic distribution.
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
This Policy is not configurable except for the standard options.
Jeffrey Ryan Thalhammer <thaljef@cpan.org>
Copyright (c) 2005-2008 Jeffrey Ryan Thalhammer. 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.