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Perl::Critic::Policy::BuiltinFunctions::ProhibitVoidGrep

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.

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