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Perl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGrep - Use "List::MoreUtils::any"
instead of "grep" in boolean context.
This Policy is part of the core Perl::Critic distribution.
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
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.
This Policy is not configurable except for the standard options.
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
Chris Dolan <email@example.com>
Initial development of this policy was supported by a grant from the Perl Foundation.
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 Perl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGrep(3)
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