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Node Cookbook

You're reading from   Node Cookbook Over 50 recipes to master the art of asynchronous server-side JavaScript using Node with this book and ebook.

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Product type Paperback
Published in Jul 2012
Publisher Packt
ISBN-13 9781849517188
Length 342 pages
Edition 1st Edition
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Author (1):
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David Mark Clements David Mark Clements
Author Profile Icon David Mark Clements
David Mark Clements
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Toc

Table of Contents (16) Chapters Close

Node Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
1. Preface
1. Making a Web Server 2. Exploring the HTTP Object FREE CHAPTER 3. Working with Data Serialization 4. Interfacing with Databases 5. Transcending AJAX: Using WebSockets 6. Accelerating Development with Express 7. Implementing Security, Encryption, and Authentication 8. Integrating Network Paradigms 9. Writing Your Own Node Modules 10. Taking It Live

Writing a functional module mock-up


Now that we have our tests written (see previous recipe), we are ready to create our module (incidentally, from here on we'll be using the should version of our unit tests as opposed to assert).

In this recipe, we'll write our module in simple functional style to demonstrate proof of concept. In the next recipe, we'll refactor our code into a more common modular format centered on reusability and extendibility.

Getting ready

Let's open our main index.js and link it to the lib directory via module.exports.

module.exports = require('./lib');

This allows us to place the meat of our module code neatly inside the lib directory.

How to do it...

We'll open up lib/index.js and begin by requiring the fs module, which will be used to read an MP3 file, and setting up a bitrates map that cross references hex-represented values to bitrate values as defined by the MPEG-1 specification.

var fs = require('fs');
//half-byte (4bit) hex values to interpreted bitrates (bps)
/...
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