From: "Peña, Botp" <botp@...>
Date: 2009-03-04T12:37:23+09:00
Subject: Re: parse a tree

From: Michael Malone [mailto:michael.malone@tait.co.nz] 
#..
# def tree_walk(array)
#     array.each { |item| (item.class == Array)? 
                           ^^^^^^^^^^^^^^^^^^^^                        
                           item.is_a? Array

# tree_walk(item) : puts item }
# end


note that the above tree_walk is equivalent to, 

  puts array