# memoizable.rb

Path: | lib/supplemental/facets/memoizable.rb
Last Update: | Sat Dec 03 12:31:52 +0000 2011

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.

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