Perl::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 v5.28.2 Perl::Critic::Policy::BuiltinFunctions::ProhibitVoidGrep(3)
perl-critic 1.134.0 - Generated Mon Jun 3 07:20:31 CDT 2019