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.IX Title "Perl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGrep 3pm"
.TH Perl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGrep 3pm "2020-05-17" "perl v5.30.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Perl::Critic::Policy::BuiltinFunctions::ProhibitBooleanGrep \- Use "List::MoreUtils::any" instead of "grep" in boolean context.
.SH "AFFILIATION"
.IX Header "AFFILIATION"
This Policy is part of the core Perl::Critic
distribution.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Using \f(CW\*(C`grep\*(C'\fR 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.
.PP
But consider the case of a long array where the first element is a
match.  Boolean \f(CW\*(C`grep\*(C'\fR still checks all of the rest of the elements
needlessly.  Instead, a better solution is to use the \f(CW\*(C`any\*(C'\fR function
from List::MoreUtils, which short-circuits after
the first successful match to save time.
.SH "CONFIGURATION"
.IX Header "CONFIGURATION"
This Policy is not configurable except for the standard options.
.SH "CAVEATS"
.IX Header "CAVEATS"
The algorithm for detecting boolean context takes a \s-1LOT\s0 of shortcuts.
There are lots of known false negatives.  But, I was conservative in
writing this, so I hope there are no false positives.
.SH "AUTHOR"
.IX Header "AUTHOR"
Chris Dolan <cdolan@cpan.org>
.SH "CREDITS"
.IX Header "CREDITS"
Initial development of this policy was supported by a grant from the
Perl Foundation.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (c) 2007\-2011 Chris Dolan.  Many rights reserved.
.PP
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 \s-1LICENSE\s0 file included with this module.