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Perl::Critic::Policy::Subroutines::ProhibitReturnSort.3pm

NAME

Perl::Critic::Policy::Subroutines::ProhibitReturnSort - Behavior of "sort" is not defined if called in scalar context.

AFFILIATION

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

DESCRIPTION

The behavior of the builtin "sort" function is not defined if called in scalar context. So if you write a subroutine that directly "return"s the result of a "sort" operation, then you code will behave unpredictably if someone calls your subroutine in a scalar context. This Policy emits a violation if the "return" keyword is directly followed by the "sort" function. To safely return a sorted list of values from a subroutine, you should assign the sorted values to a temporary variable first. For example:

    sub frobulate {
 
        return sort @list;  # not ok!
 
        @sorted_list = sort @list;
        return @sort        # ok
    }
 
 

KNOWN BUGS

This Policy is not sensitive to the "wantarray" function. So the following code would generate a false violation:

    sub frobulate {
 
        if (wantarray) {
            return sort @list;
        }
        else{
            return join @list;
        }
    }
 
 

CONFIGURATION

This Policy is not configurable except for the standard options.

CREDITS

This Policy was suggested by Ulrich Wisser and the <http://iis.se> team.

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.