Clojure's `iterate` function in Ruby

gistfile1.rb

class Object
  def iterate(&block)
    Enumerator.new do |yielder|
      current = self
      loop do
        yielder << current
        current = yield(current)
      end
    end
  end
end

p 1.iterate{|i| i + 1}.take(5)
# => [1, 2, 3, 4, 5]