Perl::Critic::Policy::ControlStructures::ProhibitUntilBlocks(3)

NAME
Perl::Critic::Policy::ControlStructures::ProhibitUntilBlocks - Write "while(! $condition)" instead of "until($condition)".

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

DESCRIPTION
Conway discourages using "until" because it leads to double-negatives that are hard to understand. Instead, reverse the logic and use "while".

    until($condition)     { do_something() } #not ok
    until(! $no_flag)     { do_something() } #really bad
    while( ! $condition)  { do_something() } #ok

This Policy only covers the block-form of "until". 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 <jeff@imaginative-software.com>

COPYRIGHT
Copyright (c) 2005-2011 Imaginative Software Systems. 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.