Functional Programming: Closures and Memoization in JavaScript

The goal of this post is to explain how to implement closures and memoization in JavaScript. I learn better when I code and if you’re like me, then you will surely enjoy this article.

Now before we jump into the topic, let us summarize what we know of functional programming — what are closures, and what do we actually mean when we use the term memoization?

Functional programming

Functional programming is a declarative type of programming style. It is a programming paradigm in which we try to bind everything in pure mathematical functions style. …