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Perl::Critic::PoPerl::UseriContributedBPerliDocumentationrohibitBooleanGrep(3)

NAME
       Perl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGrep - Use
       "List::MoreUtils::any" instead of "grep"	in boolean context.

AFFILIATION
       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION
       Using "grep" in boolean context is a common idiom for checking if any
       elements	in a list match	a condition.  This works because boolean
       context is a subset of scalar context, and grep returns the number of
       matches in scalar context.  A non-zero number of	matches	means a	match.

       But consider the	case of	a long array where the first element is	a
       match.  Boolean "grep" still checks all of the rest of the elements
       needlessly.  Instead, a better solution is to use the "any" function
       from List::MoreUtils, which short-circuits after	the first successful
       match to	save time.

CONFIGURATION
       This Policy is not configurable except for the standard options.

CAVEATS
       The algorithm for detecting boolean context takes a LOT of shortcuts.
       There are lots of known false negatives.	 But, I	was conservative in
       writing this, so	I hope there are no false positives.

AUTHOR
       Chris Dolan <cdolan@cpan.org>

CREDITS
       Initial development of this policy was supported	by a grant from	the
       Perl Foundation.

COPYRIGHT
       Copyright (c) 2007-2011 Chris Dolan.  Many 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 v5.24.1	Perl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGrep(3)

NAME | AFFILIATION | DESCRIPTION | CONFIGURATION | CAVEATS | AUTHOR | CREDITS | COPYRIGHT

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