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

The line between proxy and decorator

At this point in the book, you might have some legitimate doubts about the differences between the Proxy and the Decorator patterns. These two patterns are indeed very similar and they can sometimes be used interchangeably.

In its classic incarnation, the Decorator pattern is defined as a mechanism that allows us to enhance an existing object with new behavior, while the Proxy pattern is used to control access to a concrete or virtual object.

There is a conceptual difference between the two patterns, and it's mostly based on the way they are used at runtime.

You can look at the Decorator pattern as a wrapper; you can take different types of objects and decide to wrap them with a decorator to enhance their capabilities with extra functionality. A proxy, instead, is used to control the access to an object and it does not change the original interface. For this reason, once you have created a proxy instance, you can pass it over to...