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)
14
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15
Index

Revealing Constructor

The Revealing Constructor pattern is one of those patterns that you won't find in the "Gang of Four" book, since it originated directly from the JavaScript and the Node.js community. It solves a very tricky problem, which is: how can we "reveal" some private functionality of an object only at the moment of the object's creation? This is particularly useful when we want to allow an object's internals to be manipulated only during its creation phase. This allows for a few interesting scenarios, such as:

  • Creating objects that can be modified only at creation time
  • Creating objects whose custom behavior can be defined only at creation time
  • Creating objects that can be initialized only once at creation time

These are just a few possibilities enabled by the Revealing Constructor pattern. But to better understand all the possible use cases, let's see what the pattern is about by looking at the following...