ruby-memoizer.rb

ruby-memoizer.rb

module Memoizable
  module ClassMethods
    @@memoizable = Hash.new

    def memoize(method_name, &block)
      define_method(method_name) do |*args|
        puts @@memoizable
        @@memoizable["#{self.class.name}|#{method_name}|#{args}"] ||= block.call(*args)
      end
    end
  end

  def self.included(base)
    base.extend(ClassMethods)
  end
end

class Calculator
  include Memoizable

  memoize :sum do |a, b|
    a + b
  end
end

Calculator.new.sum(4,5)
Calculator.new.sum(1,3)
Calculator.new.sum(4,5)