Mastering Async/Await v1.1.0

Become your team's expert on escaping callback hell.

Imagine writing your entire Express API or React app with for loops and if statements. No more deeply nested callbacks or convoluted promise chains. With async/await, you can make that dream a reality.

Mastering Async/Await provides a concise and comprehensive guide to async/await fundamentals. You'll learn:

• Why React and Express don't support async/await out of the box, and how to work around these frameworks' limitations.
• How to evaluate whether your favorite npm modules support async/await.
• How promises work under the hood, in excruciating detail, by building a Promises/A+ compliant promise library from scratch.
• Why async/await is the perfect complement to promises, rather than an alternative.
• How to use async/await to handle errors and keep nasty red error messages out of your Chrome console.
• Why async/await works perfectly with for loops and if statements, but not functional constructs like forEach.
• How to avoid common async/await mistakes, like using return in a try/catch.

Mastering Async/Await packs all this and more into 52 terse pages. That means you can get caught up on modern asynchronous JavaScript in hours, not days. Stop copy/pasting snippets from StackOverflow and become the expert your team goes to for all things async.

Updated for 2021, including answers to the exercises and a new section on async generator functions.

About the Author

Valeri Karpov is the lead maintainer of Mongoose. He's a core contributor to Mocha, Agenda, and other npm modules with over 10M combined monthly downloads. He's the author of The 80/20 Guide to ES2015 Generators and Professional AngularJS. His blog is the top result on Google for "async await design patterns".

Check out Valeri Karpov on JavaScript Jabber, one of the top JavaScript podcasts.

Check out Valeri Karpov on JavaScript Weekly, the #1 JavaScript newsletter.

Preview

• Table of Contents
• Pages 30-31

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What Developers are Saying

So I started reading "Mastering Async/Await" by @code_barbarian - and just like his "Generators guide" it is an awesome practical tutorial for all the ways you should be using "async/await" in JS. No fluff, straight examples, great text. https://t.co/nnAEFhtTjj

— Gleb Bahmutov (@bahmutov) July 2, 2018

So, like I said a few minutes ago, I purchased "Mastering Async/Await" from @code_barbarian , well he happens to have another bookhttps://t.co/gr0TZNCSJN
The 80/20 Guide to ES2015 Generators. I feel like it's Christmas.

Thanks @code_barbarian, can't wait to start reading.

— Tony Brown ⚛️ ❤️ 💻 👑 (@pixelBender67) September 19, 2018

Just bought the "Mastering async/await" book from @code_barbarian.
Thank you Valeri for putting this together!

Find it here: https://t.co/WnsH4tqDld pic.twitter.com/KYh5QZROap

— Marcus Poehls ⚡️ (@marcuspoehls) July 4, 2018

I'm super impressed with @code_barbarian 's latest ebook: Mastering Async/Await. Check it out: https://t.co/8tsaVfSjsN

— Brad Vogel (@BradVogel) July 10, 2018

I've been awaiting to read "Mastering Async/Await" by @code_barbarian (https://t.co/4AOjVSTpTz) and finally resolved the promise. Concise and very informative! My ebook was not spiral-bound, but contents were otherwise as described ;-). #GoodReads #nodejs pic.twitter.com/b4jQwQniXQ

— Stennie (@stennie) September 27, 2018

From the maintainer of my favorite @MongoDB library @mongoosejs, comes a new book giving a deep dive on learning and understanding Async/Await, one of the best new features of es6.

ch-ch-ch-check it outtt https://t.co/givAinTbPV

— Harry Wolff (@hswolff) June 14, 2018