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<h1 class="title">Mastering Async/Await</h1>
<h3 class="tagline">
Become your team's expert on escaping callback hell.
</h3>
<p>
Imagine writing your entire <a href="http://expressjs.com/">Express</a> API
or <a href="https://reactjs.org/">React</a> 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.
</p>
<p>
<i>Mastering Async/Await</i> provides a concise and comprehensive guide to
async/await fundamentals. You'll learn:
</p>
<ul>
<li>Why React and Express don't support async/await out of the box, and how to work around these frameworks' limitations.</li>
<li>How to evaluate whether your favorite <a href="http://npmjs.com/">npm</a> modules support async/await.</li>
<li>How promises work under the hood, in excruciating detail, by building a <a href="https://promisesaplus.com/">Promises/A+</a> compliant promise library from scratch.</li>
<li>Why async/await is the perfect complement to promises, rather than an alternative.</li>
<li>How to use async/await to handle errors and keep nasty red error messages out of your Chrome console.</li>
<li>Why async/await works perfectly with <code>for</code> loops and <code>if</code> statements, but not functional constructs like <code>forEach</code>.</li>
<li>How to avoid common async/await mistakes, like using <code>return</code> in a <code>try/catch</code>.
</ul>
<p>
<i>Mastering Async/Await</i> 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.
</p>
<h3>
<h3>About the Author</h3>
<p id="author">
<img src="https://pbs.twimg.com/profile_images/891062607053860864/rDX7vHYT_400x400.jpg" style="float: right; width: 145px; margin-left: 10px">
Valeri Karpov is the lead maintainer of <a href="https://www.npmjs.com/package/mongoose">Mongoose</a>.
He's a core contributor to
<a href="https://www.npmjs.com/package/mocha">Mocha</a>, <a href="https://www.npmjs.com/package/agenda">Agenda</a>,
and other npm modules with over 10M combined monthly downloads.
He's the author of <a href="http://es2015generators.com/"><i>The 80/20 Guide to ES2015 Generators</i></a>
and <a href="https://www.amazon.com/Professional-AngularJS-Valeri-Karpov/dp/1118832078/ref=sr_1_1?ie=UTF8&qid=1528769632&sr=8-1&keywords=professional+angularjs"><i>Professional AngularJS</i></a>.
<a href="http://thecodebarbarian.com/">His blog</a>
is the top result on Google for "async await design patterns".
<div class="clear"></div>
</p>
<p>
Check out
<a href="https://devchat.tv/js-jabber/jsj-329-promises-promise-finally-and-async-await-with-valeri-karpov/">Valeri Karpov on JavaScript Jabber</a>,
one of the
<a href="https://snipcart.com/blog/javascript-podcasts">top JavaScript podcasts</a>.
</p>
<p>
Check out <a href="https://javascriptweekly.com/issues/413">Valeri Karpov on JavaScript Weekly</a>,
the <a href="https://usersnap.com/blog/web-development-newsletters/">#1 JavaScript newsletter</a>.
</p>
<h3>Preview</h3>
<ul>
<li><a href="/bin/toc.pdf">Table of Contents</a></li>
<li><a href="/bin/page-30-31.pdf">Pages 30-31</a></li>
</ul>
<h3>Buy</h3>
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<del> $27.95 </del>
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<small>for Wyncode students</small>
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Have an issue?
<a href="https://github.com/vkarpov15/mastering-async-await-issues/issues">Report it on GitHub</a>
and we'll respond within 24 hours
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Not happy with your purchase? Report an issue on the
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<h3>What Developers are Saying</h3>
<blockquote data-cards="hidden" class="twitter-tweet" data-lang="en"><p lang="en" dir="ltr">So I started reading "Mastering Async/Await" by <a href="https://twitter.com/code_barbarian?ref_src=twsrc%5Etfw">@code_barbarian</a> - 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. <a href="https://t.co/nnAEFhtTjj">https://t.co/nnAEFhtTjj</a></p>— Gleb Bahmutov (@bahmutov) <a href="https://twitter.com/bahmutov/status/1013882918941446146?ref_src=twsrc%5Etfw">July 2, 2018</a></blockquote>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
<blockquote data-cards="hidden" class="twitter-tweet" data-lang="en"><p lang="en" dir="ltr">So, like I said a few minutes ago, I purchased "Mastering Async/Await" from <a href="https://twitter.com/code_barbarian?ref_src=twsrc%5Etfw">@code_barbarian</a> , well he happens to have another book<a href="https://t.co/gr0TZNCSJN">https://t.co/gr0TZNCSJN</a><br>The 80/20 Guide to ES2015 Generators. I feel like it's Christmas.<br><br>Thanks <a href="https://twitter.com/code_barbarian?ref_src=twsrc%5Etfw">@code_barbarian</a>, can't wait to start reading.</p>— Tony Brown ⚛️ ❤️ 💻 👑 (@pixelBender67) <a href="https://twitter.com/pixelBender67/status/1042367743620784130?ref_src=twsrc%5Etfw">September 19, 2018</a></blockquote>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
<blockquote data-cards="hidden" class="twitter-tweet" data-lang="en"><p lang="en" dir="ltr">Just bought the "Mastering async/await" book from <a href="https://twitter.com/code_barbarian?ref_src=twsrc%5Etfw">@code_barbarian</a>.<br>Thank you Valeri for putting this together!<br><br>Find it here: <a href="https://t.co/WnsH4tqDld">https://t.co/WnsH4tqDld</a> <a href="https://t.co/KYh5QZROap">pic.twitter.com/KYh5QZROap</a></p>— Marcus Poehls ⚡️ (@marcuspoehls) <a href="https://twitter.com/marcuspoehls/status/1014520503485259779?ref_src=twsrc%5Etfw">July 4, 2018</a></blockquote>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
<blockquote data-cards="hidden" class="twitter-tweet" data-lang="en"><p lang="en" dir="ltr">I'm super impressed with <a href="https://twitter.com/code_barbarian?ref_src=twsrc%5Etfw">@code_barbarian</a> 's latest ebook: Mastering Async/Await. Check it out: <a href="https://t.co/8tsaVfSjsN">https://t.co/8tsaVfSjsN</a></p>— Brad Vogel (@BradVogel) <a href="https://twitter.com/BradVogel/status/1016473731332390913?ref_src=twsrc%5Etfw">July 10, 2018</a></blockquote>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
<blockquote data-cards="hidden" class="twitter-tweet" data-lang="en"><p lang="en" dir="ltr">I've been awaiting to read "Mastering Async/Await" by <a href="https://twitter.com/code_barbarian?ref_src=twsrc%5Etfw">@code_barbarian</a> (<a href="https://t.co/4AOjVSTpTz">https://t.co/4AOjVSTpTz</a>) and finally resolved the promise. Concise and very informative! My ebook was not spiral-bound, but contents were otherwise as described ;-). <a href="https://twitter.com/hashtag/GoodReads?src=hash&ref_src=twsrc%5Etfw">#GoodReads</a> <a href="https://twitter.com/hashtag/nodejs?src=hash&ref_src=twsrc%5Etfw">#nodejs</a> <a href="https://t.co/b4jQwQniXQ">pic.twitter.com/b4jQwQniXQ</a></p>— Stennie (@stennie) <a href="https://twitter.com/stennie/status/1045154322202353664?ref_src=twsrc%5Etfw">September 27, 2018</a></blockquote>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
<blockquote data-cards="hidden" class="twitter-tweet" data-lang="en"><p lang="en" dir="ltr">From the maintainer of my favorite <a href="https://twitter.com/MongoDB?ref_src=twsrc%5Etfw">@MongoDB</a> library <a href="https://twitter.com/mongoosejs?ref_src=twsrc%5Etfw">@mongoosejs</a>, comes a new book giving a deep dive on learning and understanding Async/Await, one of the best new features of es6.<br><br>ch-ch-ch-check it outtt <a href="https://t.co/givAinTbPV">https://t.co/givAinTbPV</a></p>— Harry Wolff (@hswolff) <a href="https://twitter.com/hswolff/status/1007340590210699265?ref_src=twsrc%5Etfw">June 14, 2018</a></blockquote>
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