Perl::Critic::Policy::BuiltinFunctions::ProhibitVoidGrep.3pm

Langue: en

Version: 2010-09-08 (fedora - 01/12/10)

Section: 3 (Bibliothèques de fonctions)

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 <thaljef@cpan.org> Copyright (c) 2005-2009 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.