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Manual Reference Pages  -  PERL::CRITIC::POLICY::CONTROLSTRUCTURES::PROHIBITNEGATIVEEXPRESSIONSINUNLESSANDUNTILCONDITIONS (3)

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NAME

Perl::Critic::Policy::ControlStructures::ProhibitNegativeExpressionsInUnlessAndUntilConditions - Don’t use operators like "not", "!~", and "le" within "until" and "unless".

CONTENTS

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.

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perl v5.20.3 PERL::CRITIC::POLICY::CONTROLSTRUCTURES::PROHIBITNEGATIVEEXPRESSIONSINUNLESSANDUNTILCONDITIONS (3) 2016-04-03

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