Book Image

Learning Node.js Development

By : Andrew Mead
Book Image

Learning Node.js Development

By: Andrew Mead

Overview of this book

Learning Node.js Development is a practical, project-based book that provides you with all you need to get started as a Node.js developer. Node is a ubiquitous technology on the modern web, and an essential part of any web developers' toolkit. If you are looking to create real-world Node applications, or you want to switch careers or launch a side project to generate some extra income, then you're in the right place. This book has been written around a single goal—turning you into a professional Node developer capable of developing, testing, and deploying real-world production applications. Learning Node.js Development is built from the ground up around the latest version of Node.js (version 9.x.x). You'll be learning all the cutting-edge features available only in the latest software versions. This book cuts through the mass of information available around Node and delivers the essential skills that you need to become a Node developer. It takes you through creating complete apps and understanding how to build, deploy, and test your own Node apps. It maps out everything in a comprehensive, easy-to-follow package designed to get you up and running quickly.
Table of Contents (13 chapters)

The asynchronous testing

In this section, you'll learn how to test asynchronous functions. The process of testing asynchronous functions isn't that different from synchronous ones, like what we've done already, but it is a little different so it justifies its own section.

Creating the asyncAdd function using the setTimeout object

To kick things off, we'll make a fake async function using setTimeout to simulate a delay inside utils.js. Just below where we make our add function, let's make one called asyncAdd. It'll essentially have the same features, but it'll use setTimeout and it'll have a callback to simulate a delay. Now in the real world, this delay might be a database request or...