Ruby Simple Memoization

memoizer.rb

# Play with this at https://eval.in/468799
class Memoizer
  class MemoEmpty; end
  def initialize(proc = nil, &block) # I should write something to make this easier as well.
    @marker == MemoEmpty.new
    @cache = {}
    @cache.default = @marker
    if block_given?
      @block = block
    elsif proc
      @block = proc
    else
      raise ArgumentError, 'must give proc or block'
    end
  end
  def call(*args)
    if @cache[args].object_id == @marker.object_id
      @cache[args] = @block[*args]
    end
    @cache[args]
  end
  alias_method :[], :call
end