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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>javascript async/await patterns</title>
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/black.css" id="theme">
<!-- Code syntax highlighting -->
<link rel="stylesheet" href="lib/css/zenburn.css">
<link rel="stylesheet" href="css/custom.css">
<!-- Printing and PDF exports -->
<script>
var link = document.createElement( 'link' );
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = window.location.search.match( /print-pdf/gi ) ? 'css/print/pdf.css' : 'css/print/paper.css';
document.getElementsByTagName( 'head' )[0].appendChild( link );
</script>
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section>
<h2>js Async/Awaitier<br />The Awaitening</h2>
<p>
<small>by Chris Hiestand <a href="http://twitter.com/dimmer">@dimmer</a></small>
</p>
</section>
<section>
<pre><code data-trim class="js" contenteditable style="max-height: 700px; max-width: 960px;">
import _Isofetch from 'isomorphic-fetch';
async function getIp_P() {
let ip = await fetch('https://api.ipify.org?format=json')
.then((response) => {
return response.json();
});
return ip;
}
function main() {
[1,2,3].map(async () => {
console.log('wan ip:');
console.log(await getIp_P());
});
}
main();
</code></pre>
</section>
<section class="antiexample">
<p>Output</p>
<pre><code data-trim contenteditable style="max-height: 700px; max-width: 960px;">
wan ip:
wan ip:
wan ip:
{ ip: '1.2.3.4' }
{ ip: '1.2.3.4' }
{ ip: '1.2.3.4' }</code></pre>
</section>
<section>
<h3>See `async` think `Promise`</h3>
<pre><code data-trim class="js" contenteditable style="max-height: 700px; max-width: 960px;">
async function main() {
return 'hello, wait for it, world';
}
console.log(main());
</code></pre>
<p>Output</p>
<pre><code data-trim class="javascript" contenteditable style="max-height: 700px; max-width: 960px;">
Promise {
_d:
{ p: [Circular],
c: [],
a: undefined,
s: 1,
d: true,
v: 'hello, wait for it, world',
h: false,
n: true } }
</code></pre>
</section>
<section>
<h3>Transpiled</h3>
<pre><code data-trim class="js" contenteditable style="max-height: 700px; max-width: 960px;">
var _asyncToGenerator2 = require('babel-runtime/helpers/asyncToGenerator');
var _asyncToGenerator3 = _interopRequireDefault(_asyncToGenerator2);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
let main = function () {
var ref = (0, _asyncToGenerator3.default)(function* () {
return 'hello, wait for it, world';
});
return function main() {
return ref.apply(this, arguments);
};
}();
console.log(main());
</code></pre>
</section>
<section>
<p>Promises return immediately<br />
but settle eventually</p>
<pre><code data-trim class="js" contenteditable style="max-height: 700px; max-width: 960px;">
async function blah() {
let foo = await doStuff_P();
//more stuff
return foo;
}
function main() {
blah(); //returns promise immediately
}
</code></pre>
</section>
<section>
<h3>Promise.map</h3>
<pre><code data-trim class="js" contenteditable style="max-height: 700px; max-width: 960px;">
import _Isofetch from 'isomorphic-fetch';
import _Promise from 'bluebird';
async function getIp_P() {
let ip = await fetch('https://api.ipify.org?format=json')
.then((response) => {
return response.json();
});
return ip;
}
function main() {
_Promise.map([1,2,3], async () => {
console.log('wan ip:');
console.log(await getIp_P());
}, {concurrency: 1});
}
main();
</code></pre>
</section>
<section>
<p>Output</p>
<pre><code data-trim contenteditable style="max-height: 700px; max-width: 960px;">
wan ip:
{ ip: '1.2.3.4' }
wan ip:
{ ip: '1.2.3.4' }
wan ip:
{ ip: '1.2.3.4' }
</code></pre>
</section>
<section>
<pre><code data-trim class="js" contenteditable style="max-height: 700px; max-width: 960px;">
import _Isofetch from 'isomorphic-fetch';
async function getIp_P() {
let ip = await fetch('https://api.ipify.org?format=json')
.then((response) => {
return response.json();
});
return ip;
}
async function main() {
let i = 0;
while( i < 3 ) {
console.log('wan ip:');
console.log(await getIp_P());
i++;
}
}
main();
</code></pre>
</section>
<section>
<p>Output</p>
<pre><code data-trim contenteditable style="max-height: 700px; max-width: 960px;">
wan ip:
{ ip: '1.2.3.4' }
wan ip:
{ ip: '1.2.3.4' }
wan ip:
{ ip: '1.2.3.4' }
</code></pre>
</section>
<section>
<h3>Summary</h3>
<p>Async ⊧ Promise</p>
<p>Iterable + Async love with:
<pre><code data-trim class="js" contenteditable>await Promise.map([1,2,3], remote_P)</code></pre>
</p>
<p>Related blog post at: <a href="http://goo.gl/9J2S5V">http://goo.gl/9J2S5V</a></p>
</section>
</div>
</div>
<script src="lib/js/head.min.js"></script>
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<script>
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