Description

Memoization is an optimization technique used primarily to speed up programs by having function calls avoid repeating the calculation of results for previously-processed inputs.

When you "memoize" a method/function using Memoizable its results are cached so that later calls return results from the cache instead of recalculating them.

class T
  include Memoizable

  def initialize(a)
    @a = a
  end

  def a
    "#{@a ^ 3 + 4}"
  end

  memoize :a
end

t = T.new(10)
(t.a.__id__ == t.a.__id__)  #=> true

This method can also be used at the instance level to cache singleton (qua class) methods by including it in the singleton class.