Matching text using grep Post: 302665827

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perl::critic::policy::builtinfunctions::prohibitbooleangrep

Perl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGUser3Contributed Perl DocumePerl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGrep(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 v5.16.3							    2014-06-09	    Perl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGrep(3)

10 More Discussions You Might Find Interesting

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Discussion started by: hemangjani

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Discussion started by: paragkalra

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Issues while pattern matching using grep

Discussion started by: RP09

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Grep the non-matching lines

Discussion started by: AK47