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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Sharpen Your Saw 5</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/solarized.css" id="theme">
<!-- Code syntax highlighting -->
<link rel="stylesheet" href="lib/css/zenburn.css">
<!--[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>Sharpen Your Saw 5</h2>
<ol>
<li class="fragment">The Presentation</li>
<li class="fragment">The Challenge</li>
<li class="fragment">Show and Tell</li>
</ol>
</section>
<section>
<h3>Redux</h3>
<div class="fragment">Library for managing application state</div>
<div class="fragment">Commonly paired with React</div>
<!-- poll audience -->
</section>
<section>
<section>
<h3>Beginning of the slides about React</h3>
<div class="fragment">Initial renders are easy. Mutating UI is hard.</div>
<div class="fragment">Pure functions are good. Side effects are bad.</div>
</section>
<section>
<h3>Write as if UI were a pure function of state</h3>
<div class="fragment">Lots of mutative magic under the hood</div>
</section>
</section>
<section>
<section>
<h3>Application state</h3>
<div class="fragment">What if you could manage it with pure functions?</div>
<div class="fragment">
<pre><code class="hljs">
(oldState, action) => newState
</code></pre>
</div>
<div class="fragment">
<pre><code class="hljs">
function updateState (state, action) {
return someTransformation(state, action.releventPayload);
}
</code></pre>
</div>
<div class="fragment">
<pre><code class="hljs">
function incrementCounter (state, action) {
return _.assign({}, state, { counter: state.counter + 1 });
}
</code></pre>
</div>
</section>
<section>
<h3>Before</h3>
<pre><code class="hljs">
handleChange(event) {
this.setState({ fieldValue: event.target.value });
}
</code></pre>
<h3>After</h3>
<pre><code class="hljs">
handleChange(event) {
this.props.dispatch({
type: "SET_FIELD_VALUE",
value: event.target.value
});
}
</code></pre>
<pre><code class="hljs">
function fieldValueReducer(state, action) {
return _.assign({}, state, { fieldValue: action.value });
}
</code></pre>
</section>
</section>
<section>
<section>
<h3>Two Gripes</h3>
<div class="fragment">1. Too much boilerplate</div>
<div class="fragment">2. The gotcha: the reducer code has to be immutable</div>
</section>
<section>
<h3>Mutative code</h3>
<pre><code class="hljs">
const oldState = { size: 2 };
const newState = oldState;
newState.size = 4;
oldState === newState
// true
</code></pre>
</section>
<section>
<h3>Immutable code</h3>
<pre><code class="hljs">
const oldState = { size: 2 };
const newState = _.assign({}, oldState, { size: 4 });
oldState === newState
// false
</code></pre>
</section>
<section>
<h3>Immutable code in Redux</h3>
<pre><code class="hljs">
function updateSize(state, action) {
return _.assign({}, state, { size: action.size });
}
</code></pre>
</section>
<section>
<h3>Immutable code in Redux</h3>
<pre><code class="hljs">
function updateSizeOfItemInArray(state, action) {
return _.assign({}, state, {
itemList: [
...state.itemList.slice(0, action.index),
_.assign({}, state.itemList[action.index], {
size: action.size
}),
...state.itemList.slice(action.index + 1)
]
});
}
</code></pre>
</section>
<section>
<h3>Immutable code in Redux</h3>
<pre><code class="hljs">
function updateSizeOfItemInArray(state, action) {
const newState = _.cloneDeep(state);
newState[action.index].size = action.size;
return newState;
}
</code></pre>
</section>
</section>
</section>
<section>
<section>
<h3>Part 2: The Challenge</h3>
https://shackbarth.github.io/sharpen-your-saw
</section>
<section>
<img src="http://static.poetryfoundation.org/o/harriet/2015/08/Eunoia-by-Christian-Bok-001.jpg" />
</section>
<section>
<h3>Eunoia</h3>
Crooks who con folks go door to door to show folks lots of books on how to boost longshot growth of hot-shot stocks or low-cost bonds. Crooks who do so fob off fool's gold onto fools... most of whom own posh co-op condos.
</section>
<section>
<h3>Eunoia</h3>
Scots from hogtowns or cowtowns work from cockcrow to moondown -- to chop down woodlots, to plow down cornrows.
</section>
<section>
<h3>Eunoia</h3>
Ku-klux cults kung-fu punch Ubu.
</section>
</section>
<section>
<section>
<h3>Part 3: Show and Tell</h3>
</section>
<section>
<a href="https://gist.github.com/codingcampbell/ec72f930a09acd15f4900b0732f0b7c0">Matt Campbell</a>
</section>
<section>
<h3></h3>
<pre><code class="hljs" style="max-height:1000px;width:1200px;margin-left:-200px;">
function getVowels(word) {
return _.intersection(word.toLowerCase().split(""), "aeiouy".split(""));
}
function checkWord (state, action) {
const vowels = _.uniq(_.flatten(_.map(state.list.concat([action.word]), getVowels)));
if (vowels.length === 1) {
return _.assign({}, state, { list: state.list.concat([action.word]) });
}
return state;
}
</code></pre>
</section>
<section>
<pre><code class="hljs" style="max-height:1000px;width:1200px;margin-left:-200px;">
describe("checkWord", () => {
let state;
beforeEach(() => {
state = { list: [] };
});
it("adds a new eunoic word", () => {
state = checkWord(state, { word: "foo" });
assert.deepEqual(state, { list: ["foo"] });
});
it("does not add a new non-eunoic word", () => {
state = checkWord(state, { word: "about" });
assert.deepEqual(state, { list: [] });
});
it("adds a eunoic word to a compatible list", () => {
state = { list: ["When", "Helen", "feels", "these", "stresses"] };
state = checkWord(state, { word: "fee" });
assert.include(state.list, "fee");
});
it("does not add a eunoic word to an incompatible list", () => {
state = { list: ["When", "Helen", "feels", "these", "stresses"] };
state = checkWord(state, { word: "foo" });
assert.notInclude(state.list, "foo");
});
});
</code></pre>
</section>
<section>
<h3></h3>
<pre><code class="hljs" style="max-height:1000px;width:1200px;margin-left:-200px;">
function generateWords () {
const dict = fs.readFileSync("/usr/share/dict/words", "utf8");
const allWords = _.orderBy(dict.split("\n"), () => Math.random());
let state = { list: [] };
for (const word of allWords) {
state = checkWord(state, { word });
if (state.list.length >= 100) {
break;
}
}
return state.list;
}
</code></pre>
</section>
<section>
Ginni risp. Shii virginitis pilgrimism. Bilskirnir knights minis tink twirls.
Triplicist swigs mirths philhippic spivs inkings linksmith siskins thickwit schtiks.
Viki skirt filings skip dibs chippings. Vivl pigs. Briggs bink.
Phillipp whipstitch stinkbird cinching tiffish. Bring instincts jiggish ictic tibbit.
Thill. Cripps disbind glink gift birring girling. Nitti pricing.
Ziv gists instinct hildings chirking. Idhi whisting. Cdiz immis gimp pimpling.
<br><br>
<a href="https://github.com/shackbarth/sharpen-your-saw/blob/master/eunoia.js">Link to eunoia.js</a>
</section>
</section>
</div>
</div>
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<script src="js/reveal.js"></script>
<script>
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