That applies to all dynamic languages with useful list operations, really. Have an example in Ruby's forebear language: sub twitter_handles { my (

That applies to all dynamic languages with useful list operations, really. Have an example in Ruby's forebear language: sub twitter_handles { my ( $authors, $company ) = @_; grep defined, map $_->twitter_handle, grep $_->company eq $company, @$authors; } This free book goes into the same kind of topic, only much more deep: http://hop.perl.plover.com/ http://hop.perl.plover.com/