Faraz K. Kelhini - Modern Asynchronous JavaScript
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- Book:Modern Asynchronous JavaScript
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JavaScript today must interact with data-intensive APIs and networks. The solution is a program that can work asynchronously instead of finishing tasks in order. In modern JavaScript, instead of callbacks youll use promises to improve your applications performance and responsiveness. JavaScript features introduced in ES2020, ES2021, and ESNext like Promise.allSettled(), Promise.any(), and top-level await help you develop small, fast, low-profile applications. With the AbortController API, cancel a pending async request before it has completed. Modern Asynchronous JavaScript gives you an arsenal of tools to build programs that always respond to user requests, recover quickly from difficult conditions, and deliver maximum performance.
Applications today must work with information on remote servers, and users expect a quick response to complex interactions at all times, whether on a high-speed 5G cellular network or slow public WiFi. JavaScript provides developers with advanced tools to coordinate the asynchronous parts of their code efficiently and deliver responsive programs. Faster applications equal happier users, which is the promise of asynchronous JavaScript.
With Modern Asynchronous JavaScript youll learn techniques for managing your async code. Features like ES2021 Promise.any() allow you to safeguard your async code from external issues that are out of your control like server downtime. Youll discover secret weapons like top-level await to initialize resources, define dependency paths dynamically, and load dependencies with a fallback implementation. Youll even learn to how to set a time limit for async requests and react if they take too long to complete.
Fast, reliable applications are a must in todays world, where users demand increasingly greater amounts of data on mobile devices. Asynchronous programming may require more cautious planning than synchronous programming but the outcome is rewarding. Asynchronous JavaScript allows you to write code that is nimble but reliable, leading to programs that load faster, respond quicker, and most importantly that you can trust to function properly.
What You Need:
Youll need an intermediate level of JavaScript programming skills and a browser that supports features from ES2020, ES2021, and ESNext.
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For developers looking to level up on both their command and understanding of asynchronous JavaScript, especially newer and less familiar methods on the Promise API, this is an indispensable reference and solid guide. Faraz Kelhini walks you through the thorny problems around working asynchronously with iterables and provides excellent and inspiring examples and easy-to-study source code.
| Karl Stolley |
| Web Developer, Researcher, Professor, and Author of Programming WebRTC , Illinois Institute of Technology |
Faraz Kelhinis efficient organization and fine writing make Modern Asynchronous JavaScript a valuable introduction to the topic. The dozens of succinct code examples that are included round out an indispensable package for the intermediate-to-advanced JavaScripter.
| Victor Gavenda |
| Former Executive Editor, Pearson Education/Peachpit Press |
JavaScript moves fast, and even seasoned developers need to pay attention to keep up with the language. Modern Asynchronous JavaScript is a pithy primer on newly introduced JavaScript features that help make asynchronous code more concise and safer. Anyone writing asynchronous JavaScript code, whether it runs in a browser or in Node.js, should pay attention. All of the ugly JavaScript code Ive written recently wishes Id read this book sooner.
| Lukas Mathis |
| Software Engineer, UI Designer, and Author of Designed for Use , Appway |
Ive worked with countless technical writers throughout my career, and Faraz stands out among them for his ability to clearly and concisely explain complex topics. His work in Modern Asynchronous JavaScript meets those high standards and then some. Even for a non-dev like myself, Faraz makes it easy to grasp the concepts at work.
| Matt Angelosanto |
| Managing Editor, LogRocket Blog |
Acknowledgments
Writing and producing a book requires a team effort. My sincere thanks to the entire Pragmatic Bookshelf team for their great efforts to get this book to fruition. In particular, I would like to thank my editor, Margaret Eldridge, whose watchful eyes identified gaps in my writing and saved me from mistakes.
A big thanks to experts who reviewed the book prior to publication, including Karl Stolley, Lukas Mathis, Michael Fazio, Trevor Burham, Kevin Gisi, Matthew Margolis, Mike Riley, Francesco Piccoli, and Stefan Turalski. These wonderful developers offered very helpful insight on the code quality and suggested ways to improve.
My love to my family for their support and putting up with an authors crankiness. I am grateful for that. And special thanks to my dear friends, Mahsa and Asal, for their encouragement during the writing of this book. Youre amazing!
Finally, thanks to the eager readers who bought the book while it was in beta. You put your trust in me, and I appreciate that.
Preface
Modern applications increasingly rely on asynchronous programming to perform multiple tasks at the same time, and JavaScript is quickly evolving to address this need. Many new features of JavaScript are designed to only work asynchronously. As a result, gaining the knowledge to perform async tasks effectively is a must for todays JavaScript programmers.
Designing responsive asynchronous programs might be challenging at first, but once you get the hang of it, the outcome is rewarding. This book is here to help you with that. Youll find multiple examples to help you write advanced programs using the new capabilities of JavaScript introduced in ES2020, ES2021, and ESNext. Youll also discover various techniques to manage and coordinate the asynchronous parts of your codeefficiently.
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