With the new ECMAScript standard, we got the new class syntax for having a form of object-oriented programming (OOP) and, later, we also got modules, a way of importing and exporting user-defined collections of functions and objects. Both of these systems have enabled us to remove certain hacks that we built into the system, and also remove certain libraries that were close to essential for modularizing our code bases.
First, we need to understand what type of language JavaScript is. JavaScript is a multi-paradigm language. This means that we can utilize many of the ideas that are out there for different programming styles and incorporate them into our code base. One style of programming that we have touched on in previous chapters is the functional style of programming.
In pure functional programming, we have pure functions, or functions that...
