Differing between array like and hash like objects

gistfile1.rb

# Came across an issue when working on a serializer/deserializer
# needed to know whether something was array like or hash like.

class Object
  
  def array_like?
    self.respond_to?(:each) && respond_to?(:at)
  end
  
  def hash_like?
    self.respond_to?(:each) && !array_like?
  end
  
end