What is the most basic container type a language can have? Some people may answer vectors, others would go with hash tables, but in this post I am arguing in favor of functions. Yes, functions. Even though they aren’t generally seem as a data structure per se, we will see that most containers are in fact a way to represent a function with a given storage layout. To illustrate this “functions are containers” idea, let’s take a look at an application that tightly couples both concepts: memoization. post 
The Lazy Way to … page