NAME

Perl::Critic::Policy::ControlStructures::ProhibitUnlessBlocks - Write if(! $condition) instead of unless($condition).

AFFILIATION

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

DESCRIPTION

Conway discourages using unless because it leads to double-negatives that are hard to understand. Instead, reverse the logic and use if.

    unless($condition) { do_something() } #not ok
    unless(! $no_flag) { do_something() } #really bad
    if( ! $condition)  { do_something() } #ok

This Policy only covers the block-form of unless. For the postfix variety, see ProhibitPostfixControls.

CONFIGURATION

This Policy is not configurable except for the standard options.

SEE ALSO

Perl::Critic::Policy::ControlStructures::ProhibitPostfixControls

AUTHOR

Jeffrey Ryan Thalhammer <thaljef@cpan.org>

COPYRIGHT

Copyright (c) 2005-2009 Jeffrey Ryan Thalhammer. 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.