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class Hash
  # By default, only instances of Hash itself are extractable.
  # Subclasses of Hash may implement this method and return
  # true to declare themselves as extractable. If a Hash
  # is extractable, Array#extract_options! pops it from
  # the Array when it is the last element of the Array.
  def extractable_options?
    instance_of?(Hash)
  end
end

class Array
  # Extracts options from a set of arguments. Removes and returns the last
  # element in the array if it's a hash, otherwise returns a blank hash.
  #
  # def options(*args)
  # args.extract_options!
  # end
  #
  # options(1, 2) # => {}
  # options(1, 2, :a => :b) # => {:a=>:b}
  def extract_options!
    if last.is_a?(Hash) && last.extractable_options?
      pop
    else
      {}
    end
  end
end
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