Book Image

Modern JavaScript Web Development Cookbook

By : Federico Kereki
Book Image

Modern JavaScript Web Development Cookbook

By: Federico Kereki

Overview of this book

JavaScript has evolved into a language that you can use on any platform. Modern JavaScript Web Development Cookbook is a perfect blend of solutions for traditional JavaScript development and modern areas that developers have lately been exploring with JavaScript. This comprehensive guide teaches you how to work with JavaScript on servers, browsers, mobile phones and desktops. You will start by exploring the new features of ES8. You will then move on to learning the use of ES8 on servers (with Node.js), with the objective of producing services and microservices and dealing with authentication and CORS. Once you get accustomed to ES8, you will learn to apply it to browsers using frameworks, such as React and Redux, which interact through Ajax with services. You will then understand the use of a modern framework to develop the UI. In addition to this, development for mobile devices with React Native will walk you through the benefits of creating native apps, both for Android and iOS. Finally, you’ll be able to apply your new-found knowledge of server-side and client-side tools to develop applications with Electron.
Table of Contents (15 chapters)

Using promises instead of error first callbacks

Now, let's start considering several techniques that will come in handy when writing services.

Node runs as a single thread, so if every time it had to call a service, or read a file, or access a database, or do any other I/O-related operation, it would have to wait for it to finish, then attending requests would take a long time, blocking other requests from being attended, and the server would show a very bad performance. Instead, all operations such as those are always done asynchronically, and you must provide a callback that will be called whenever the operation is finished; meanwhile, Node will be available to process other clients' requests.

There are synchronous versions of many functions, but they can only be applied for desktop work, and never for web servers.

Node established a standard that all callbacks should...