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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  • 3.1 A simple event: Modify the asynchronous FindRegex class so that it emits an event when the find process starts, passing the input files list as an argument. Hint: beware of Zalgo!
  • 3.2 Ticker: Write a function that accepts a number and a callback as the arguments. The function will return an EventEmitter that emits an event called tick every 50 milliseconds until the number of milliseconds is passed from the invocation of the function. The function will also call the callback when the number of milliseconds has passed, providing, as the result, the total count of tick events emitted. Hint: you can use setTimeout() to schedule another setTimeout() recursively.
  • 3.3 A simple modification: Modify the function created in exercise 3.2 so that it emits a tick event immediately after the function is invoked.
  • 3.4 Playing with errors: Modify the function created in exercise 3.3 so that it produces an error if the timestamp at the moment of a tick ...