I checked out some of the new Ruby features at theluckystiff.net and saw
'ducktype'ing.  It sounds uber cool.  Is this what is meant by ducktype?
(The code may be inelegant; I don't know; I'm still a Ruby Nuby).  Please
correct me if I got it wrong.

######################################################################
#
#  ducktype
#
#  This method accepts two parameters.  The first is an array of
#strings. The second is anything.  As long as every string in x is the
#name of one of the methods provided by y, the method will return
#true.  I grunged the return value to make sure it only returns true 
#or false.
#

def ducktype (x, y)
   !(!( x.map{|f| break false if !y.respond_to?(f) }))
end

#####################################################################


This is sort of like having a discovered mixin.  Neat.  

BTW, thanks Matz and all the contribs.  This is fun!

Drew