Memoization

Memoization is a technique for performance optimization. It is, essentially, calculating a value once and then caching it within an object for the duration of its use.

Memoization comes from the Latin word “memorandum”, meaning “to be remembered”.

(Sourced from Jason Swett’s post on memoization)

class Product

  def price
    expensive_calculation
  end

  def memoized_price
    @memoized_price || expensive_calculation
  end

  def expensive_calculation
    sleep 1
    500
  end
end