Book Image

Building Enterprise JavaScript Applications

By : Daniel Li
Book Image

Building Enterprise JavaScript Applications

By: Daniel Li

Overview of this book

With the over-abundance of tools in the JavaScript ecosystem, it's easy to feel lost. Build tools, package managers, loaders, bundlers, linters, compilers, transpilers, typecheckers - how do you make sense of it all? In this book, we will build a simple API and React application from scratch. We begin by setting up our development environment using Git, yarn, Babel, and ESLint. Then, we will use Express, Elasticsearch and JSON Web Tokens (JWTs) to build a stateless API service. For the front-end, we will use React, Redux, and Webpack. A central theme in the book is maintaining code quality. As such, we will enforce a Test-Driven Development (TDD) process using Selenium, Cucumber, Mocha, Sinon, and Istanbul. As we progress through the book, the focus will shift towards automation and infrastructure. You will learn to work with Continuous Integration (CI) servers like Jenkins, deploying services inside Docker containers, and run them on Kubernetes. By following this book, you would gain the skills needed to build robust, production-ready applications.
Table of Contents (26 chapters)
Title Page
Copyright and Credits
Packt Upsell
Free Chapter
The Importance of Good Code

Chapter 1. The Importance of Good Code

One thing that separates a good company from a great company is their processes. In a great company, everyone understands what is expected of them, what they can expect from others, the vision of the company, and the philosophy of the workplace. With that foundation, the staff has the freedom to be creative and innovate, working within the processes and boundaries set by the company.

When there are no processes, there is chaos. Developers wouldn't know what to expect— are the requirements and specifications documented? Where can I find them? They also wouldn't understand what's expected of themdo I need to write tests or is this a Proof of Concept (PoC)? What edge cases should I test for? Without processes, managers and developers will waste time chasing requirements and clarifications, giving them less time to be creative and innovative, and thus excel at their jobs.

Ultimately, a chaotic environment leads to a product that's lower in quality. On the technical side, there'll be more technical debt—bugs and inefficiencies that need to be fixed later. The product team will suffer too, as fewer features would be delivered.

For these companies, the best way to improve is simply to start implementing robust processes on the technical level by implementing Test-Driven Development (TDD), and on the management level by adopting Agile principles and/or implementing the Scrum framework. In this chapter, we will focus on the technical aspect—implementing TDD. Specifically, we will cover the following:

  • What is technical debt?
  • What are the causes and consequences of technical debt?
  • Reducing technical debt by implementing TDD