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Perl::Critic::Policy::BuiltinFunctions::ProhibitReverseSortBlock.3pm

NAME

Perl::Critic::Policy::BuiltinFunctions::ProhibitReverseSortBlock - Forbid $b before $a in sort blocks.

AFFILIATION

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

DESCRIPTION

Conway says that it is much clearer to use "reverse" than to flip $a and $b around in a "sort" block. He also suggests that, in newer perls, "reverse" is specifically looked for and optimized, and in the case of a simple reversed string "sort", using "reverse" with a "sort" with no block is faster even in old perls.

     my @foo = sort { $b cmp $a } @bar;         #not ok
     my @foo = reverse sort @bar;               #ok
 
     my @foo = sort { $b <=> $a } @bar;         #not ok
     my @foo = reverse sort { $a <=> $b } @bar; #ok
 
 

CONFIGURATION

This Policy is not configurable except for the standard options.

AUTHOR

Chris Dolan <cdolan@cpan.org>

COPYRIGHT

Copyright (c) 2006-2009 Chris Dolan.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.