Perl::Critic::Policy::ValuesAndExpressions::ProhibitMismatchedOperators(3pm)
                                           User Contributed Perl Documentation


NAME
       Perl::Critic::Policy::ValuesAndExpressions::ProhibitMismatchedOperators
       - Don't mix numeric operators with string operands, or vice-versa.

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

DESCRIPTION
       Using the wrong operator type for a value can obscure coding intent and
       possibly lead to subtle errors.  An example of this is mixing a string
       equality operator with a numeric value, or vice-versa.

           if ($foo == 'bar') {}     #not ok
           if ($foo eq 'bar') {}     #ok
           if ($foo eq 123) {}       #not ok
           if ($foo == 123) {}       #ok

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

NOTES
       If warnings are enabled, the Perl interpreter usually warns you about
       using mismatched operators at run-time.  This Policy does essentially
       the same thing, but at author-time.  That way, you can find out about
       them sooner.

       Perl handles the strings 'NaN' and 'inf' as special numbers and creates
       an NV struct when compared with a numeric operator.  Although not
       necessary it is allowed to write code such as:
           my $i = 'inf'+0; This pattern helps others understand that the
       variable is indeed the Infinite or NaN numbers as Perl interprets them.
       Only these two special string numbers are allowed to have the '+'
       operator which would otherwise be allowed only for strings.

AUTHOR
       Peter Guzis <pguzis@cpan.org>

COPYRIGHT
       Copyright (c) 2006-2022 Peter Guzis.  All 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 v5.38.0                      2023-07-26
  Perl::Critic::Policy::ValuesAndExpressions::ProhibitMismatchedOperators(3pm)