Node.js Design Patterns: Master a series of patterns and techniques to create modular, scalable, and efficient applications

Mario Casciaro

€41.99

4.8 (28 Ratings)

Paperback Dec 2014 454 pages 1st Edition

Mario Casciaro

€41.99

4.8 (28 Ratings)

Paperback Dec 2014 454 pages 1st Edition

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Node.js Design Patterns

Chapter 2. Asynchronous Control Flow Patterns

Moving from a synchronous programming style to a platform such as Node.js, where continuation-passing style and asynchronous APIs are the norm, can be frustrating. Writing asynchronous code can be a different experience, especially when it comes to control flow. Simple problems such as iterating over a set of files, executing tasks in sequence, or waiting for a set of operations to complete, require the developer to take new approaches and techniques to avoid ending up writing inefficient and unreadable code. One common mistake is to fall into the trap of the callback hell problem and see the code growing horizontally rather than vertically, with a nesting that makes even simple routines hard to read and maintain.

In this chapter, we will see how it's actually possible to tame callbacks and write clean, manageable asynchronous code by using some discipline and with the aid of some patterns. We will see how control flow libraries, such as async...

Comparison

At this point of the chapter, we should have a better understanding of what options we have to tame the asynchronous nature of Node.js. Each one of the solutions presented has its own pros and cons. Let's summarize them in the following table:

Solutions	Pros	Cons
Plain JavaScript	Does not require any additional library or technology Offers the best performances Provides the best level of compatibility with third-party libraries Allows the creation of ad hoc and more advanced algorithms	Might require extra code and relatively complex algorithms
Async	Simplifies the most common control flow patterns Is still a callback-based solution Good performances	Introduces an external dependency Might still not be enough for advanced flows
Promises	Greatly simplify the most common control flow patterns Robust error handling Part of the ES6 specification Guarantee deferred invocation of `onFulfilled` and `onRejected`	Might require an external dependency Require to promisify callback-based...

Key benefits

Dive into the core patterns and components of Node.js in order to master your application's design
Learn tricks, techniques, and best practices to solve common design and coding challenges
Take a code-centric approach to using Node.js without friction

Description

Node.js is a massively popular software platform that lets you use JavaScript to easily create scalable server-side applications. It allows you to create efficient code, enabling a more sustainable way of writing software made of only one language across the full stack, along with extreme levels of reusability, pragmatism, simplicity, and collaboration. Node.js is revolutionizing the web and the way people and companies create their software. In this book, we will take you on a journey across various ideas and components, and the challenges you would commonly encounter while designing and developing software using the Node.js platform. You will also discover the "Node.js way" of dealing with design and coding decisions. The book kicks off by exploring the fundamental principles and components that define the platform. It then shows you how to master asynchronous programming and how to design elegant and reusable components using well-known patterns and techniques. The book rounds off by teaching you the various approaches to scale, distribute, and integrate your Node.js application.

Who is this book for?

If you're a JavaScript developer interested in a deeper understanding of how to create and design Node.js applications, this is the book for you.

What you will learn

Design and implement a series of server-side JavaScript patterns so you understand why and when to apply them in different use case scenarios
Understand the fundamental Node.js components and use them to their full potential
Untangle your modules by organizing and connecting them coherently
Reuse well-known solutions to circumvent common design and coding issues
Deal with asynchronous code with comfort and ease
Identify and prevent common problems, programming errors, and anti-patterns

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Amazon verified reviews

David AB Nov 10, 2015

Read this and you'll get serious and deep understanding of node.js, and specific ways to implement in your project.Great discussion and solutions to avoid the sync vs async design and implementation issues in node.This is the most advanced complete and useful node.js book I've read.I enjoy it very much, and keep coming back to it to help me design and code.Thank you Mario for all the times you didn't go out for beers with your friends so you could publish your bookKudos to Packt and the reviewers. Great job, Great Book!

Amazon Verified review

Jarno Virta Dec 25, 2015

This is an absolutely fabulous book on nodejs. It is very well written and the code examples are very good and useful. It is obvious that the author has very deep knowledge of the language and the design patterns he writes of.The book starts with an explanation of the fundamental principles of node and of how asynchronous tasks run in node. The book then covers different patterns for writing asynchronous code. Next, streams are explained. For me, these early chapters were extremely useful as asynchronous code and streams are quite new to me and often cause some problems. The other chapters cover design patterns in node, node modules, scaling node apps and messaging and integration patterns.What can I say, this is a must for anyone writing code in node. Everything in the book, including the code examples, are very useful in practice. Although the examples are not unnecessarily complex, I found that reading the book required quite a lot of attention. This may be in part due to the fact that I am new to node, but the book is definitely quite dense in many parts. I think that it is therefore a good idea to either bang out the example codes yourself or at least download them from the publisher's site and go through the code files with a lot of thought.

P. Greenberg Mar 01, 2015

I have been working with node.js for almost 2 years, and read several books on the subject, but this one is by far the best!The author takes a bottoms-up approach to teaching node.js, and does an outstanding job covering everything from beginner topics like the event loop and callback patterns to advanced topics like scaling. In fact, of every published work on node.js I’ve read, this is the first that covers scaling, an essential part of real-world applications.The code examples in this book are also uniquely easy to follow, as the author uses footnotes to explain the important or confusing concepts. In addition, the examples explain the use case and construction of useful functions before revealing the node_module that already implements it, giving the reader an incredible depth of knowledge shared amongst few in the node community.I will be purchasing multiple copies of this book for our office and recommend it to anyone looking to learn more about node.js, from beginners to experienced developers.

Tomer Ben David Apr 22, 2016

this is an amazing book. must have for any 2015+ software engineer!

L M Feb 20, 2015

Assolutamente suggerito a tutti coloro che conoscono Javascript ma non sono del tutto convinti che Node.js possa essere un'ottima soluzione per lo sviluppo di applicazioni enterprise. Questo libro vi farà completamente cambiare idea e vi introdurrà ai principali design pattern utili per essere immediatamente operativi ed evitare errori grossolani.

Node.js Design Patterns: Master a series of patterns and techniques to create modular, scalable, and efficient applications

What do you get with Print?

Node.js Design Patterns

Chapter 2. Asynchronous Control Flow Patterns

The difficulties of asynchronous programming

Using plain JavaScript

Callback discipline

The async library

Promises

Note

What is a promise?

Generators

Note

Comparison

Summary

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