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)

Advanced promises

In this section, we'll explore two more ways to use promises. We'll create functions that take input and return a promise. Also, we'll explore promise chaining, which will let us combine multiple promises.

Providing input to promises

Now the problem with the example we discussed in the previous section is that we have a promise function, but it doesn't take any input. This most likely is never going to be the case when we're using real-world promises. We'll want to provide some input, such as the ID of a user to fetch from the database, a URL to request, or a partial URL, for example, just the address component.

In order to do this, we'll have to create a function. For this...