Book Image

Node Cookbook

By : David Mark Clements
Book Image

Node Cookbook

By: David Mark Clements

Overview of this book

The principles of asynchronous event-driven programming are perfect for today's web, where efficient real-time applications and scalability are at the forefront. Server-side JavaScript has been here since the 90's but Node got it right. With a thriving community and interest from Internet giants, it could be the PHP of tomorrow. "Node Cookbook" shows you how to transfer your JavaScript skills to server side programming. With simple examples and supporting code, "Node Cookbook" talks you through various server side scenarios often saving you time, effort, and trouble by demonstrating best practices and showing you how to avoid security faux pas. Beginning with making your own web server, the practical recipes in this cookbook are designed to smoothly progress you to making full web applications, command line applications, and Node modules. Node Cookbook takes you through interfacing with various database backends such as MySQL, MongoDB and Redis, working with web sockets, and interfacing with network protocols, such as SMTP. Additionally, there are recipes on correctly performing heavy computations, security implementations, writing, your own Node modules and different ways to take your apps live.
Table of Contents (16 chapters)
Node Cookbook
About the Author
About the Reviewers

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)