Manual Reference Pages - PERL::CRITIC::POLICY::BUILTINFUNCTIONS::PROHIBITBOOLEANGREP (3)
Perl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGrep - Use "List::MoreUtils::any" instead of "grep" in boolean context.
This Policy is part of the core Perl::Critic
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
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 false positives.
Chris Dolan <email@example.com>
Initial development of this policy was supported by a grant from the
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 v5.20.3 ||PERL::CRITIC::POLICY::BUILTINFUNCTIONS::PROHIBITBOOLEANGREP (3) ||2016-04-03 |
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