Introduction

In the previous chapter, we explored the concepts of modular design, ES6 modules, and their use with Node.js. We took our compiled ES6 JavaScript and converted it into a compatible script using Babel.

In this chapter, we'll discuss code quality, which is one of the key qualities of professional JavaScript development. When we start writing code, we tend to focus on solving simple problems and evaluating the outcome. When it comes to the small pet projects that most developers start with, there is little need to communicate with others or work as part of a large team.

As the projects, you work on becoming larger in scope, the importance of code quality increases. In addition to ensuring that the code works, we have to consider other developers who will use the components we create or update the code we write.

There are several aspects of quality code. The first and most obvious is that it does what it is intended to do. This is often easier said than done...