a rotator for Jeff

rotate.rb

def rotator_factory(*values)
  Enumerator.new do |y|
    loop do
      y.yield values.first
      values = values.rotate
    end
  end
end

r = rotator_factory('a','b','c')
r.next # => 'a'
r.next # => 'b'
r.next # => 'c'
r.next # => 'a'