clojure.rb

module Clojure
  def self.repeat(x, n = nil)
    [x].cycle(n)
  end

  def self.repeatedly(n = nil, &block)
    i = n || Float::INFINITY
    Enumerator.new(n) do |yielder|
      while i > 0
        yielder << block.call
        i -= 1
      end
    end
  end

  def self.iterate(x, &block)
    Enumerator.new do |yielder|
      yielder << x

      y = begin
            x.dup
          rescue TypeError
            x
          end

      loop do
        y = block.call(y)
        yielder << y
      end
    end
  end
end