NAME¶
Perl::Critic::Policy::ControlStructures::ProhibitNegativeExpressionsInUnlessAndUntilConditions
- Don't use operators like "not", "!~", and "le"
within "until" and "unless".
AFFILIATION¶
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION¶
until ($foo ne 'blah') { #not ok
...
}
while ($foo eq 'blah') { #ok
...
}
A number of people have problems figuring out the meaning of doubly negated
expressions. "unless" and "until" are both negative
constructs, so any negative (e.g. "!~") or reversible operators
(e.g. "le") included in their conditional expressions are double
negations. Conway considers the following operators to be difficult to
understand within "unless" and "until":
! not
!~ ne !=
< > <= >= <=>
lt gt le ge cmp
CONFIGURATION¶
This Policy is not configurable except for the standard options.
SEE ALSO¶
Perl::Critic::Policy::ControlStructures::ProhibitUnlessBlocks
AUTHOR¶
Elliot Shank "<perl@galumph.com>"
COPYRIGHT¶
Copyright (c) 2007-2011 Elliot Shank.
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.