NAME

       Perl::Critic::Policy::BuiltinFunctions::ProhibitComplexMappings - Map blocks should have a
       single statement.

AFFILIATION

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

DESCRIPTION

       The map function can be confusing to novices in the best of circumstances.  Mappings with
       multiple statements are even worse.  They're also a maintainer's nightmare because any
       added complexity decreases readability precipitously.  Why?  Because map is traditionally
       a one-liner converting one array to another.  Trying to cram lots of functionality into a
       one-liner is a bad idea in general.

       The best solutions to a complex mapping are: 1) write a subroutine that performs the
       manipulation and call that from map; 2) rewrite the map as a for loop.

CAVEATS

       This policy currently misses some compound statements inside of the map.  For example, the
       following code incorrectly does not trigger a violation:

           map { do { foo(); bar() } } @list

CONFIGURATION

       By default this policy flags any mappings with more than one statement.  While we do not
       recommend it, you can increase this limit as follows in a .perlcriticrc file:

           [BuiltinFunctions::ProhibitComplexMappings]
           max_statements = 2

AUTHOR

       Chris Dolan <cdolan@cpan.org>

CREDITS

       Initial development of this policy was supported by a grant from the Perl Foundation.

COPYRIGHT

       Copyright (c) 2007-2011 Chris Dolan.

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

perl v5.20.2                 Perl::Critic::Policy::BuiltinFunctions::ProhibitComplexMappings(3pm)