Book Image

Node.js Design Patterns - Third Edition

By : Mario Casciaro, Luciano Mammino
5 (1)
Book Image

Node.js Design Patterns - Third Edition

5 (1)
By: Mario Casciaro, Luciano Mammino

Overview of this book

In this book, we will show you how to implement a series of best practices and design patterns to help you create efficient and robust Node.js applications with ease. We kick off by exploring the basics of Node.js, analyzing its asynchronous event driven architecture and its fundamental design patterns. We then show you how to build asynchronous control flow patterns with callbacks, promises and async/await. Next, we dive into Node.js streams, unveiling their power and showing you how to use them at their full capacity. Following streams is an analysis of different creational, structural, and behavioral design patterns that take full advantage of JavaScript and Node.js. Lastly, the book dives into more advanced concepts such as Universal JavaScript, scalability and messaging patterns to help you build enterprise-grade distributed applications. Throughout the book, you’ll see Node.js in action with the help of several real-life examples leveraging technologies such as LevelDB, Redis, RabbitMQ, ZeroMQ, and many others. They will be used to demonstrate a pattern or technique, but they will also give you a great introduction to the Node.js ecosystem and its set of solutions.
Table of Contents (16 chapters)
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Wiring modules

Every application is the result of the aggregation of several components and, as the application grows, the way we connect these components becomes a win or lose factor for the maintainability and success of the project.

When a component, A, needs component B to fulfill a given functionality, we say that "A is dependent on B" or, conversely, that "B is a dependency of A." To appreciate this concept, let's present an example.

Let's say we want to write an API for a blogging system that uses a database to store its data. We can have a generic module implementing a database connection (db.js) and a blog module that exposes the main functionality to create and retrieve blog posts from the database (blog.js).

The following figure illustrates the relationship between the database module and the blog module:


Figure 7.1: Dependency graph between the blog module and the database module

In this section, we are going to see...