Conway suggests that all built-in functions be called without parentheses around the argument list. This reduces visual clutter and disambiguates built-in functions from user functions. Exceptions are made for my, local, and our which require parentheses when called with multiple arguments.

  open($handle, '>', $filename); #not ok
  open $handle, '>', $filename;  #ok
  split(/$pattern/, @list); #not ok
  split /$pattern/, @list;  #ok


Coding with parens can sometimes lead to verbose and awkward constructs, so I think the intent of Conway's guideline is to remove only the unnecessary parens. This policy makes exceptions for some common situations where parens are usually required. However, you may find other situations where the parens are necessary to enforce precedence, but they cause still violations. In those cases, consider using the '## no critic' comments to silence Perl::Critic.


Jeffrey Ryan Thalhammer <thaljef@cpan.org>


Copyright (c) 2005-2007 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.