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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>The Case for React.js and ClojureScript</title>
<meta name="description" content="Sonian Tech Talk presentation given on may 2, 2014">
<meta name="author" content="Murilo Pereira">
<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">
<link rel="stylesheet" href="css/reveal.min.css">
<link rel="stylesheet" href="css/theme/simple.css" id="theme">
<!-- For syntax highlighting -->
<link rel="stylesheet" href="lib/css/zenburn.css">
<!-- If the query includes 'print-pdf', include the PDF print sheet -->
<script>
if( window.location.search.match( /print-pdf/gi ) ) {
var link = document.createElement( 'link' );
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = 'css/print/pdf.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">
<div class="slides">
<section data-id="e44f1a82f2b9dbf4579683a24c39f9a8" class="">
<h2>The Case for</h2>
<h1>React.js and ClojureScript</h1>
<p>
<br>
</p>
<p align="center">Murilo Pereira</p>
<p align="center">
<a target="_blank" href="https://twitter.com/mpereira">@mpereira</a>
</p>
<p align="center">May 2, 2014<br>
</p>
</section>
<section data-id="c3a7395387083933476c1a4e6ac4813e" class="">
<h1>Problem</h1>
</section>
<section data-background-color="rgba( 200, 50, 30, 0.6 )" data-id="42bc3956a9dd6110352ed01e9c321452" class="">
<h1>Building UIs is difficult.<br>
</h1>
</section>
<section data-id="e092c27bcc271643bec578804f32ffdd" class="">
<h2 align="center">Modern Web UIs</h2>
<p align="left">
<br>
</p>
<div align="center">
<ul>
<li>
<font style="font-size: 32px;">visual representations of data changing over time</font>
</li>
<li>
<font style="font-size: 32px;">respond to asynchronous user events</font>
</li>
<li>
<font style="font-size: 32px;">transition both the underlying data and itself to new states<br>
</font>
</li>
</ul>
</div>
</section>
<section data-id="e88cee679de2acbb2dbb31a70496a711" class="">
<h2>"Data changing over time is the root of all evil."</h2>
</section>
<section data-id="ae2688dadb8f312f0404fa07e8738b0d" class="">
<h2 align="center">Incidental Complexity</h2>
<p>
<br>
</p>
<div align="center">
<ul>
<li>JavaScript isn't <a target="_blank" href="http://en.wikipedia.org/wiki/Reactive_programming">reactive</a>
</li>
<li>DOM is stateful<br>
</li>
</ul>
</div>
</section>
<section data-id="1313aa1ceabe7df2fe9b7f15b8c7739e" class="">
<h2>What if the JavaScript DOM API was reactive?<br>
</h2>
</section>
<section data-id="50de3e65493eb22def41afd830f33cbb" class="">
<pre class="stretch"><code data-trim>
function tweetScore(tweet) {
return(tweet.favorites_count + tweet.retweets_count);
}
function compareTweetsByScore(a, b) {
return(tweetScore(b) - tweetScore(a));
}
function renderApplication(tweets) {
return(document.dom.ul(
{ class: 'tweets' },
tweets
.sort(compareTweetsByScore)
.slice(0, 5)
.map(function(tweet) {
return(document.dom.li({ class: 'tweet' }, tweet.text);
})
));
}
var tweets = fetchTweets({ username: 'mpereira' }, { limit: 20 });
document.dom.render(renderApplication(tweets), document.body);
</code></pre>
<br>
</section>
<section data-id="2ed2e2ffce8a42c6ecd0edb738af2436" class="">
<h2>Possible solution: Data binding<br>
</h2>
</section>
<section data-id="f7cf6a30000cde576ad5042a2c92786a" class="">
<h2 align="center">Data Binding</h2>
<p align="center">
<br>
</p>
<div align="left">
<div align="center">
<ul>
<li>Observables</li>
<li>Computed properties</li>
</ul>
</div>
<p align="center">
<br>
</p>
<p align="center">Backbone, Ember, Meteor, et al.<br>
</p>
</div>
</section>
<section data-id="53891e575a4caff5738cf91c0a433c88" class="">
<h2>Contemporary data binding is not simple.<br>
</h2>
</section>
<section data-id="2513fb9d520d57e393d9e58519072da6" class="">
<h2>Simple</h2>
<p>
<br>
</p>
<p>Not to be mistaken for "easy"</p>
<p>
<br>
</p>
<p>Easiness = Familiarity (subjective)</p>
<p>
<br>
</p>
<p>Simplicity = "Does/is one thing" (objective)<br>
</p>
</section>
<section data-id="4ff2082fc4df4e824161d5c8314f6c49" class="">
<h2 align="center">Data Binding</h2>
<p align="center">
<br>
</p>
<div align="left">
<div align="center">
<ul>
<li>Application logic entangled with observables</li>
<li>Forces us to compose our programs with framework constructs instead of language constructs (functions and data structures)<br>
</li>
</ul>
</div>
</div>
</section>
<section data-id="7dfacd1418ee0eecb5dd7f56fa492509" class="">
<h2>"How often are you fighting the framework?"<br>
</h2>
</section>
<section data-id="e4e203af88bcef59e75456c9443b21c1" class="">
<h2>Dirty-checking (Angular)</h2>
<p>
<br>
</p>
<p>Also susceptible to the problems of data binding.<br>
</p>
</section>
<section data-background-color="rgba( 200, 50, 30, 0.6 )" data-background-size="initial" data-background-image="https://s3.amazonaws.com/media-p.slid.es/uploads/mpereira/images/377518/AngularJS__Developer_Guide__Conceptual_Overview_-_Pentadactyl.png" data-id="b266327c77884cb5ee7a46927d9df4ee" class="">
<h2>
<br>
</h2>
<p>
<br>
</p>
<p>
<br>
</p>
<p>
<br>
</p>
<p>
<br>
</p>
<p>
<br>
</p>
<p>
<br>
</p>
<p>
<br>
</p>
<p>
<br>
</p>
<p>
<span style="background-color: transparent;">
<font color="#000000">
<a target="_blank" href="https://docs.angularjs.org/guide/concepts">
<br>
</a>
</font>
</span>
</p>
<p style="position: absolute; width: 417px; height: 47px; z-index: 4; left: 489px; top: 582px;" class="absolute-element" align="right">
<span style="background-color: transparent;">
<font color="#000000">
<a target="_blank" href="http://www.infoq.com/presentations/Are-We-There-Yet-Rich-Hickey">
<font style="font-size: 24px;">https://docs.angularjs.org/guide/concepts</font>
</a>
</font>
</span>
<br>
</p>
</section>
<section data-background-color="rgba( 200, 50, 30, 0.6 )" data-id="87b083471d09e25555e844d2ca0fbfb5" class="">
<h1>Complex<br>
</h1>
</section>
<section data-id="fbb0945d731ea533a05ba6cd8e5236fd" class="">
<h2>Even with shortcomings it's still possible to build complex, modern UIs using contemporary MVC frameworks.<br>
</h2>
</section>
<section data-id="0626842efb5bf5164f4f7bad85b39015" class="">
<h2>"We can create precisely the same programs we're creating right now with drastically simpler tools."</h2>
<p>Rich Hickey<br>
</p>
</section>
<section data-id="d73751f69709b6ae5c7fc8ad1b177efd" class="">
<h2>A different solution to the same problem.<br>
</h2>
</section>
<section data-id="03fd5bb03aa5fb60c5d0a2d4da1952bd" class="">
<h1>React.js<br>
</h1>
</section>
<section data-id="02e9161793b6f2aa06e941606d701326" class="">
<h2>React.js</h2>
<p>
<br>
</p>
<ul>
<li>Library for creating UIs</li>
<li>Renders the DOM and responds to user events</li>
<li>Can be thought of as the V in MVC<br>
</li>
</ul>
<br>
</section>
<section data-id="752e63296672b5255309d3bb309812b1" class="">
<h2>Remember our utopic example a few slides back?<br>
</h2>
</section>
<section data-id="a9ec2af34b842e748fbb857504a97df0" class="">
<pre class="stretch"><code data-trim>
function tweetScore(tweet) {
return(tweet.favorites_count + tweet.retweets_count);
}
function compareTweetsByScore(a, b) {
return(tweetScore(b) - tweetScore(a));
}
function renderApplication(tweets) {
return(document.dom.ul(
{ class: 'tweets' },
tweets
.sort(compareTweetsByScore)
.slice(0, 5)
.map(function(tweet) {
return(document.dom.li({ class: 'tweet' }, tweet.text);
})
));
}
var tweets = fetchTweets({ username: 'mpereira' }, { limit: 20 });
document.dom.render(renderApplication(tweets), document.body);
</code></pre>
<br>
</section>
<section data-id="7b58f7d8417017e8643e66427ac2dcb3" class="">
<h2>It's actually valid React.js code<br>
</h2>
</section>
<section data-id="193c8b72a2ddbcb5d6bc70b014bd3859" class="">
<pre class="stretch"><code data-trim>
function tweetScore(tweet) {
return(tweet.favorites_count + tweet.retweets_count);
}
function compareTweetsByScore(a, b) {
return(tweetScore(b) - tweetScore(a));
}
function renderApplication(tweets) {
return(React.DOM.ul(
{ className: 'tweets' },
tweets
.sort(compareTweetsByScore)
.slice(0, 5)
.map(function(tweet) {
return(React.DOM.li({ className: 'tweet' }, tweet.text);
})
));
}
var tweets = fetchTweets({ username: 'mpereira' }, { limit: 20 });
React.renderComponent(renderApplication(tweets), document.body);
</code></pre>
<br>
</section>
<section data-id="c70790be90fc9f3ac984aa5936ae345e" class="">
<h2>React gives us a minimally leaky abstraction for a reactive JavaScript/DOM environment.<br>
</h2>
</section>
<section data-id="a10444c09066d32b7424449c6f487961" class="">
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<section data-background-color="rgba( 22, 152, 213, 0.6 )" data-id="b02408cb63ffd598446e936bcedbc223" class="">
<h1>Components<br>
</h1>
</section>
<section data-background-color="rgba( 22, 152, 213, 0.6 )" data-id="22ebc0db90c6dbc1fac20f4b64a7ba89" class="">
<h2>Components</h2>
<p>
<br>
</p>
<p>
<font style="font-size: 54px;">Idempotent functions that describe your UI at any point in time</font>.<br>
</p>
</section>
<section data-id="73e6923b7d85cd045e0f59cca362dd6e" class="">
<font style="font-size: 54px;">component(data) = VDOM</font>
<br>
</section>
<section data-id="817b092ae309e09adbe958d8887888b5" class="">
<h4>component(data_1) = VDOM_1</h4>
<br>
<p>*user input changes data from data_1 to data_2*</p>
<br>
<h4>component(data_2) = VDOM_2</h4>
<h4>diffVDOMs(VDOM_1, VDOM_2) = diff</h4>
<h4>DOMOperations(diff) = operations</h4>
<h4>applyDOMOperations(operations, document.body)</h4>
</section>
<section data-id="91c6d53e557c26355c03b2fdd3096214" class="">
<h2>Best part? You don't even have to worry about this. Just build components.<br>
</h2>
</section>
<section data-id="a275cbe8f8b512a8fc0b804ed85700be" class="">
<h2>Every place data is displayed is guaranteed to be up-to-date. <br>
</h2>
<h2>
<br>
</h2>
<h2>No need for KVO or marking HTML templates with framework directives.<br>
</h2>
</section>
<section data-id="20eea248791c06ab1cdf60c1cd001301" class="">
<h2>Frees the programmer from doing manual, explicit DOM operations.<br>
</h2>
</section>
<section data-id="215b2c5febebce2ff6fee53d1d66e150" class="">
<h2>But what about the performance?</h2>
<h2>
<br>
</h2>
<h2>Isn't diffing VDOMs slow?</h2>
<p>
<br>
</p>
<h2>Why have VDOMs if the browser already has a DOM?<br>
</h2>
</section>
<section data-background-color="rgba( 200, 50, 30, 0.6 )" data-id="35d89cf6c35b8c0af6f99f3eb8056f05" class="">
<h1>The DOM is slow.<br>
</h1>
</section>
<section data-id="a36ce73b7106553813a551e787051d5d" class="">
<h2>The DOM is slow</h2>
<p>
<br>
</p>
<ul>
<li>Querying may require tree traversal</li>
<li>Mutations trigger viewport reflows, relayouts, repaints (CSS engine, etc.)</li>
<li>Can also invalidate caches, requiring the entire DOM to be reconstructed on the viewport<br>
</li>
</ul>
</section>
<section data-id="95c82e0c34a28bf7a656a703d6576d7e" class="">
<h2>Having in-memory representations of the DOM allows React to have extremely fast UIs.<br>
</h2>
</section>
<section data-id="70957b05e4fa5a6a79ad48726bcdef37" class="">
<h2>Virtual DOM (VDOM)</h2>
<p>
<br>
</p>
<ul>
<li>Allows for components to have a declarative API</li>
<li>Performs the minimum amount of actual DOM operations through computing diffs</li>
<li>Handles DOM operations for you</li>
</ul>
</section>
<section data-id="291ca650278b0dc2c44f36ead4e3712a" class="">
<h2>"Performance isn't the [main] goal of the VDOM, but if you're worried with performance, most workloads are as fast or faster [than the MVC alternatives] out of the box."</h2>
<p>Pete Hunt<br>
</p>
</section>
<section data-background-color="rgba( 22, 152, 213, 0.6 )" data-id="d389399c0e28ce37bfbad678ef5ac64a" class="">
<h1>Components<br>
</h1>
</section>
<section data-background-color="rgba( 22, 152, 213, 0.6 )" data-id="2f0548eee43e6859191606376452c477" class="">
<h2>Components allow you to express your program in the language of your problem domain.</h2>
<p>
<br>
</p>
<h2>Rather than on the language of a particular framework.<br>
</h2>
</section>
<section data-id="1055cdfa054406718dc7e48759b92390" class="">
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="203px" height="403px" version="1.1"><defs/><g transform="translate(0.5,0.5)"><rect x="1" y="1" width="200" height="400" rx="25" ry="25" fill="#ffffff" stroke="#c0c0c0" pointer-events="none"/><rect x="14" y="61" width="175" height="280" fill="none" stroke="#c0c0c0" pointer-events="none"/><rect x="14" y="61" width="175" height="280" fill="none" stroke="#c0c0c0" pointer-events="none"/><ellipse cx="101" cy="20" rx="2.5" ry="2.5" fill="none" stroke="#c0c0c0" pointer-events="none"/><rect x="76" y="31" width="50" height="8" rx="4" ry="4" fill="none" stroke="#c0c0c0" pointer-events="none"/><ellipse cx="101" cy="371" rx="20" ry="20" fill="none" stroke="#c0c0c0" pointer-events="none"/><rect x="93" y="363" width="17" height="18" rx="3" ry="3" fill="none" stroke="#c0c0c0" pointer-events="none"/><rect x="31" y="106" width="60" height="60" fill="#ffffff" stroke="#000000" pointer-events="none"/><ellipse cx="61" cy="117" rx="6.25" ry="6.25" fill="#ffffff" stroke="#000000" pointer-events="none"/><path d="M 61 124 L 61 144 M 61 128 L 49 128 M 61 128 L 74 128 M 61 144 L 49 161 M 61 144 L 74 161" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><rect x="101" y="101" width="80" height="40" fill="none" stroke="none" pointer-events="none"/><g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px"><text x="141" y="125">Bill O'Reilly</text></g><rect x="31" y="181" width="140" height="50" fill="#ffffff" stroke="#000000" pointer-events="none"/><g transform="translate(33,184)"><switch><foreignObject pointer-events="all" width="136" height="45" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.26; vertical-align: top; width: 136px; white-space: normal; text-align: center;">Tide comes in, tide goes out. You can't explain that!</div></foreignObject><text x="68" y="29" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><rect x="61" y="61" width="80" height="40" fill="none" stroke="none" pointer-events="none"/><g fill="#000000" font-family="Helvetica" font-weight="bold" text-anchor="middle" font-size="14px"><text x="101" y="86">Top Tweets</text></g><rect x="31" y="231" width="140" height="30" fill="#ffffff" stroke="#000000" pointer-events="none"/><g transform="translate(33,239)"><switch><foreignObject pointer-events="all" width="136" height="15" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.26; vertical-align: top; width: 136px; white-space: normal; text-align: center;">Just had #breakfast.</div></foreignObject><text x="68" y="14" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><rect x="31" y="261" width="140" height="30" fill="#ffffff" stroke="#000000" pointer-events="none"/><g transform="translate(33,261)"><switch><foreignObject pointer-events="all" width="136" height="30" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.26; vertical-align: top; width: 136px; white-space: normal; text-align: center;">@troll yes, definitely plan on that.</div></foreignObject><text x="68" y="21" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><rect x="31" y="291" width="140" height="30" fill="#ffffff" stroke="#000000" pointer-events="none"/><g transform="translate(33,291)"><switch><foreignObject pointer-events="all" width="136" height="30" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.26; vertical-align: top; width: 136px; white-space: normal; text-align: center;">pic.twitter.com/asd23 #selfie #instagram</div></foreignObject><text x="68" y="21" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><rect x="31" y="321" width="140" height="20" fill="#ffffff" stroke="#000000" pointer-events="none"/><g transform="translate(33,324)"><switch><foreignObject pointer-events="all" width="136" height="15" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.26; vertical-align: top; width: 136px; white-space: normal; text-align: center;">Good# morning.</div></foreignObject><text x="68" y="14" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g></g></svg>
</section>
<section data-id="d1b958c43d39993d467b855f0f700b5f" class="">
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="353px" height="433px" version="1.1"><defs/><g transform="translate(0.5,0.5)"><rect x="231" y="1" width="120" height="320" fill="#ffffff" stroke="#000000" pointer-events="none"/><rect x="1" y="31" width="200" height="400" rx="25" ry="25" fill="#ffffff" stroke="#c0c0c0" pointer-events="none"/><rect x="14" y="91" width="175" height="280" fill="none" stroke="#c0c0c0" pointer-events="none"/><rect x="14" y="91" width="175" height="280" fill="none" stroke="#c0c0c0" pointer-events="none"/><ellipse cx="101" cy="50" rx="2.5" ry="2.5" fill="none" stroke="#c0c0c0" pointer-events="none"/><rect x="76" y="61" width="50" height="8" rx="4" ry="4" fill="none" stroke="#c0c0c0" pointer-events="none"/><ellipse cx="101" cy="401" rx="20" ry="20" fill="none" stroke="#c0c0c0" pointer-events="none"/><rect x="93" y="393" width="17" height="18" rx="3" ry="3" fill="none" stroke="#c0c0c0" pointer-events="none"/><rect x="21" y="131" width="160" height="70" rx="11" ry="11" fill="#ffffff" stroke="#786c74" stroke-dasharray="3 3" pointer-events="none"/><rect x="101" y="131" width="80" height="40" fill="none" stroke="none" pointer-events="none"/><g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px"><text x="141" y="155">Bill O'Reilly</text></g><rect x="31" y="136" width="60" height="60" fill="#ffffff" stroke="#000000" pointer-events="none"/><ellipse cx="61" cy="147" rx="6.25" ry="6.25" fill="#ffffff" stroke="#000000" pointer-events="none"/><path d="M 61 154 L 61 174 M 61 158 L 49 158 M 61 158 L 74 158 M 61 174 L 49 191 M 61 174 L 74 191" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><rect x="21" y="96" width="160" height="30" rx="5" ry="5" fill="#ffffff" stroke="#786c74" stroke-dasharray="3 3" pointer-events="none"/><rect x="61" y="91" width="80" height="40" fill="none" stroke="none" pointer-events="none"/><g fill="#000000" font-family="Helvetica" font-weight="bold" text-anchor="middle" font-size="14px"><text x="101" y="116">Top Tweets</text></g><rect x="21" y="206" width="160" height="175" rx="24" ry="24" fill="#ffffff" stroke="#786c74" stroke-dasharray="3 3" pointer-events="none"/><rect x="31" y="211" width="140" height="50" fill="#ffffff" stroke="#000000" pointer-events="none"/><g transform="translate(33,214)"><switch><foreignObject pointer-events="all" width="136" height="45" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.26; vertical-align: top; width: 136px; white-space: normal; text-align: center;">Tide comes in, tide goes out. You can't explain that! #tides</div></foreignObject><text x="68" y="29" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><rect x="31" y="261" width="140" height="30" fill="#ffffff" stroke="#000000" pointer-events="none"/><g transform="translate(33,269)"><switch><foreignObject pointer-events="all" width="136" height="15" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.26; vertical-align: top; width: 136px; white-space: normal; text-align: center;">Just had #breakfast.</div></foreignObject><text x="68" y="14" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><rect x="31" y="291" width="140" height="30" fill="#ffffff" stroke="#000000" pointer-events="none"/><g transform="translate(33,291)"><switch><foreignObject pointer-events="all" width="136" height="30" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.26; vertical-align: top; width: 136px; white-space: normal; text-align: center;">@troll yes, definitely plan on that.</div></foreignObject><text x="68" y="21" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><rect x="31" y="321" width="140" height="30" fill="#ffffff" stroke="#000000" pointer-events="none"/><g transform="translate(33,321)"><switch><foreignObject pointer-events="all" width="136" height="30" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.26; vertical-align: top; width: 136px; white-space: normal; text-align: center;">pic.twitter.com/asd23 #selfie #instagram</div></foreignObject><text x="68" y="21" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><rect x="31" y="351" width="140" height="20" fill="#ffffff" stroke="#000000" pointer-events="none"/><g transform="translate(33,354)"><switch><foreignObject pointer-events="all" width="136" height="15" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.26; vertical-align: top; width: 136px; white-space: normal; text-align: center;">Good# morning.</div></foreignObject><text x="68" y="14" fill="#000000" text-anchor="middle" font-size="12px" font-family="Helvetica">[Not supported by viewer]</text></switch></g><rect x="241" y="86" width="100" height="45" fill="#ffffff" stroke="#000000" pointer-events="none"/><rect x="251" y="91" width="80" height="40" fill="none" stroke="none" pointer-events="none"/><g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="14px"><text x="291" y="116">Header</text></g><path d="M 181 111 L 249 111" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><path d="M 243 115 L 250 111 L 243 108" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><rect x="241" y="144" width="100" height="45" fill="#ffffff" stroke="#000000" pointer-events="none"/><rect x="241" y="266" width="100" height="45" fill="#ffffff" stroke="#000000" pointer-events="none"/><rect x="251" y="146" width="80" height="40" fill="none" stroke="none" pointer-events="none"/><g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="14px"><text x="291" y="171">Profile</text></g><path d="M 181 166 L 249 166" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><path d="M 243 170 L 250 166 L 243 163" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><rect x="251" y="271" width="80" height="40" fill="none" stroke="none" pointer-events="none"/><g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="14px"><text x="291" y="296">Tweets</text></g><path d="M 181 292 L 249 292" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><path d="M 243 295 L 250 292 L 243 288" fill="none" stroke="#000000" stroke-miterlimit="10" pointer-events="none"/><rect x="251" y="11" width="80" height="40" fill="none" stroke="none" pointer-events="none"/><g fill="#000000" font-family="Helvetica" text-anchor="middle" font-size="12px"><text x="291" y="35">Top Tweets</text></g></g></svg>
</section>
<section data-id="2d57b03ddf8663ad026d1fd661af98ac" class="">
<pre class="stretch"><code data-trim>
var Profile = React.createClass({
render: function() {
return(React.DOM.div(null, [
React.DOM.img(null, this.props.user.image),
React.DOM.p(null, this.props.user.name)
]);
}
});
var Tweets = React.createClass({
render: function() {
return(React.DOM.ul(null, this.props.tweets.map(function(tweet) {
return(React.DOM.li(null, tweet.text));
});
}
});
var TopTweets = React.createClass({
render: function() {
return(React.DOM.div(null, [
React.DOM.h1(null, 'Top Tweets'),
Profile({ user: this.props.user }),
Tweets({ tweets: this.props.user.tweets })
]);
}
});
React.renderComponent(TopTweets({ user: user }), document.body);
</code></pre>
<br>
</section>
<section data-id="265a7f9d3839d07f4995ce5b877fb6b8" class="">
<pre class="stretch"><code data-trim>
var Profile = React.createClass({
render: function() {
return(
<div>
<img href={this.props.user.image} />
<p>{this.props.user.name}</p>
</div>
);
}
});
var Tweets = React.createClass({
render: function() {
return(
<ul>
{this.props.tweets.map(function(tweet) {
return(<li>tweet.text</li>);
})};
</ul>
);
}
});
var TopTweets = React.createClass({
render: function() {
return(
<div>
<h1>Top Tweets</h1>
<Profile user={this.props.user} />
<Tweets tweets={this.props.user.tweets} />
</div>
);
}
});
React.renderComponent(TopTweets({ user: user }), document.body);
</code></pre>
<br>
</section>
<section data-id="1127009cee25585f1c40b98953c3a24c" class="">
<h4>TopTweets(data) = Header() + Profile(data_1) + Tweets(data_2)</h4>
</section>
<section data-id="ce2055cd0d8921d01c5714e7c895511c" class="">
<h2>Components are reusable and composable declarative representations of your UI.<br>
</h2>
</section>
<section data-background-color="rgba( 22, 152, 213, 0.6 )" data-id="4880ed3859df370285cc4855c3ea82d8" class="">
<h1>Collateral Benefits<br>
</h1>
</section>
<section data-id="71e2974f0c6a12d9f3a8a2fbbe274c41" class="">
<h2>Collateral Benefits</h2>
<p>
<br>
</p>
<ul>
<li>Render the application on the server (node.js, Java 8's Nashhorn, etc.)</li>
<li>Run the entire application in a Web Worker</li>
<li>Render the VDOM to Canvas, SVG, etc.</li>
<li>UI testability for free</li>
<li>No templates!<br>
</li>
</ul>
</section>
<section data-background-color="rgba( 50, 200, 90, 0.4 )" data-id="8ddab5786f3eb5aa576041f26a4ce0c9" class="">
<h2>React.js takeaways</h2>
<ul>
<li>Declarative, fast UIs</li>
<li>Express your programs in the language of your problem domain<br>
</li>
</ul>
</section>
<section data-background-color="rgba( 22, 152, 213, 0.6 )" data-id="cd5d4434b6a4fe659a851c2a17701571" class="">
<h1>ClojureScript<br>
</h1>
</section>
<section data-background-color="rgba( 200, 50, 30, 0.6 )" data-id="b59ae1ffc1cab7012a52db25e78ad76f" class="">
<h1>
<a target="_blank" href="http://www.haskell.org/haskellwiki/The_JavaScript_Problem">Problem</a>
</h1>
<p>
<br>
</p>
<p>
<br>
</p>
<p data-fragment-index="0" class="fragment">
<font style="font-size: 42px;">JavaScript sucks</font>
</p>
<p data-fragment-index="0" class="fragment">
<br>
</p>
<p data-fragment-index="1" class="fragment">
<font style="font-size: 42px;">We need JavaScript</font>
</p>
</section>
<section data-id="9f6b51eb7023cc20308c4547b95acb81" class="">
<h2>JavaScript sucks</h2>
<p>
<br>
</p>
<ul>
<li>No integers</li>
<li>No module system</li>
<li>Verbose syntax</li>
<li>Confusing, inconsistent equality operators</li>
<li>Confusing, inconsistent automatic operator conversions</li>
<li>Lack of block scope</li>
<li>Non-uniform iterators</li>
<li>Global variables by default</li>
<li>NaN</li>
<li>this</li>
<li>No macros (yet...)</li>
<li>etc.<br>
</li>
</ul>
</section>
<section data-id="6d6876f23f8d402519f36582431a76ba" class="">
<h2>We Need JavaScript</h2>
<p>
<br>
</p>
<ul>
<li>Runtime is everywhere</li>
<li>Runtime is improving (Web Sockets, geo-location, FS API, RAF, push notifications, WebRTC, WebGL, SVG, Canvas, Web Workers, IndexedDB, etc.)<br>
</li>
</ul>
</section>
<section data-background-color="rgba( 22, 152, 213, 0.6 )" data-id="b6f47627d95b7d1b5badd1f504548c1b" class="">
<h2>Build better languages on top of JavaScript.<br>
</h2>
</section>
<section data-id="b347f31b80976d8c01a8437cad70d261" class="">
<h2>Compilers!</h2>
<p>
<br>
</p>
<ul>
<li>Lots of them already exist</li>
<li>Only a few bring significant improvements</li>
</ul>
<p>
<br>
</p>
<p>
<br>
</p>
<p>Popular ones</p>
<p>
<br>
</p>
<ul>
<li>CoffeeScript: mostly syntax sugar</li>
<li>TypeScript: typed superset of JavaScript. Brings type checking, compile time errors<br>
</li>
</ul>
</section>
<section data-background-color="rgba( 22, 152, 213, 0.6 )" data-id="e50bc1ac3728ef0fbd416cdef41b0c4a" class="">
<h1>ClojureScript<br>
</h1>
</section>
<section data-id="58cc508fa823a355c4be40b04c821325" class="">
<h2>ClojureScript is a Clojure compiler that targets JavaScript.<br>
</h2>
</section>
<section data-id="64bd5d7cc9b1e0094b9262b4a10a7ced" class="">
<h2>Why ClojureScript?</h2>
<h2>Why Clojure?</h2>
<h2>Why LISP?<br>
</h2>
</section>
<section data-id="63ec1a29cffd565e0c626a1745e02372" class="">
<h2>Clojure is just a better language.<br>
</h2>
</section>
<section data-id="d34dfe93a1a92e5c1ab0a05813338c02" class="">
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="329px" height="369px" version="1.1">
<defs>
</defs>
<g transform="translate(0.5,0.5)">
<path d="M -43 163 L 280 163" fill="none" stroke="#000000" stroke-width="2" stroke-miterlimit="10" transform="rotate(90,119,163)" pointer-events="none">
</path>
<path d="M 121 325 L 326 325" fill="none" stroke="#000000" stroke-width="2" stroke-miterlimit="10" pointer-events="none">
</path>
<rect x="151" y="322" width="40" height="3" fill="#c3ff00" stroke="#000000" pointer-events="none">