react-native-presentation/index.html at master · timbuckley/react-native-presentation · GitHub

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<!doctype html>
<html lang="en">
<!--  style="color: #ff2c2d;" red  -->
<!--  style="color: #1b91ff;" blue  -->
<!--  style="color: #17ff2e;" green  -->

  <head>
    <meta charset="utf-8">

    <title>DNA Mobile App: Tech</title>

    <meta name="description" content="A framework for easily creating beautiful presentations using HTML">
    <meta name="author" content="Hakim El Hattab">

    <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/custom.css">
    <link rel="stylesheet" href="css/theme/black.css" id="theme">

    <!-- Code syntax highlighting -->
    <link rel="stylesheet" href="lib/css/zenburn.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">

      <!-- Main -->
      <div class="slides">
        <section>
          <h1>DNA Mobile App</h1>
          <h3>Understanding ES6, React, React Native, & Redux</h3>
          <p>
            <small>Created by <a href="http://timbuckley.github.io">Tim Buckley</a></small>
          </p>
        </section>

        <!-- Table of contents -->
        <section>
          <h2>Contents</h2>
            <table>
              <tr>
                <td><em style="color: #ff2c2d;">ES6</em></td>
                <td style="font-size: 25px;">Advanced JavaScript features</td>
              </tr>
              <tr>
                <td><em style="color: #1b91ff;">React fundamentals</em></td>
                <td style="font-size: 25px;">What React really does</td>
              </tr>
              <tr>
                <td><em style="color: #1b91ff;">React Native</em></td>
                <td style="font-size: 25px;">Framework for building native mobile apps using React</td>
              </tr>
              <tr>
                <td><em style="color: #17ff2e;">Redux</em></td>
                <td style="font-size: 25px;">State management library we use for React Native</td>
              </tr>
            </table>
        </section>


        <!-- ES6 -->
        <section>
          <!-- ES6: Main -->
          <section>
            <h2 style="color: #ff2c2d;">ES6</h2>
            <ul>
              <li class="fragment">Next version of JavaScript</li>
              <li class="fragment">All of ES5 (current JavaScript) works in ES6</li>
              <li class="fragment">Mostly just syntax sugar - can do everything in plain ES5</li>
              <li class="fragment">Works out of the box in React Native</li>
            </ul>
          </section>

          <!-- ES6: arrow functions -->
          <section>
            <h3>Arrow functions</h3>
            <ul>
              <li>Nicer syntax for anonymous functions</li>
            </ul>
            <pre><code class="hljs" data-trim contenteditable>
// ES5
function (x, y) {
  return x + y
}

// ES6
(x, y) => x + y

// Example
var bozoItems = items.filter(item => item.is_bozo)

// Can also use multiline.
var sum = (x, y) => {
  console.log('The sum is...')
  return x + y
}
            </code></pre>
          </section>

          <!-- ES6: arrow functions, part 2 -->
          <section>
            <h3>Arrow functions (cont)</h3>
            <ul>
              <li>Side benefit: <code style="color:light-grey;">this</code> keyword does not change binding inside the function</li>
            </ul>

            <pre><code class="hljs" data-trim contenteditable>
// ES6
function Person(){
  this.age = 0
  // var self = this // No longer necessary.

  setInterval(() => {
    this.age++ // |this| properly refers to the person object
  }, 1000)
}
var p = new Person()
            </code></pre>
          </section>

          <!-- ES6: const and let -->
          <section>
            <h3>Const and let</h3>
            <ul>
              <li>New versions of <code>var</code></li>
              <li><code>let</code> - can be reassigned, follows scope</li>
              <li><code>const</code> - cannot be reassigned</li>
            </ul>
            <pre><code class="hljs" data-trim contenteditable>
let a = 1
a = 2 // OK

const b = 1
b = 2 // -> ERROR

const nums = [1, 2, 3, 4]
nums.push(5) // OK. Variable can be modified, just not reassigned.
            </code></pre>
          </section><!-- ES6: const and let -->

          <!-- ES6: const and let (part 2) -->
          <section>
            <h3>Const and let (cont.)</h3>
            <ul>
              <li>Adhere to block scope (yay!)</li>
              <li>Not hoisted outside of scope</li>
            </ul>
            <pre><code class="hljs" data-trim contenteditable>
function foo() {
  if (true) {
    const myvar = 1
    console.log(myvar) // prints 1
  }

  try {
    console.log(myvar)
  } catch(ex) {
    console.log('Cannot access myvar outside its block')
  }
}
foo()
            </code></pre>
          </section><!-- ES6: const and let (part 2) -->

          <!-- Default parameters -->
          <section>
            <h3>Default parameters</h3>

            <pre><code class="hljs" data-trim contenteditable>
// ES5
function favoriteThings(pie, num) {
  pie = pie || 'apple'
  num = num || 7

  return pie + num
}
favoriteThings() // 'pie7'

// ES6
function favoriteThings(pie = 'apple', num = 7) {
  return pie + num
}
favoriteThings() // 'pie7'
            </code></pre>

          </section><!-- Default parameters -->

          <!-- Spread Operator -->
          <section>
            <h3>Spread Operator</h3>
            <ul>
              <li>"Breaks out" key-values in obj, or elements in list</li>
              <li>Similar to Python's splat operator (*args)</li>
            </ul>

            <pre><code class="hljs" data-trim contenteditable>
const myObj = {a: 1, b: 2, c: 3, d: 4}
const newObj = { ...myObj, d: 40, e: 50}
console.log(myObj) // {a: 1, b: 2, c: 3, d: 4}
console.log(newObj) // {a: 1, b: 2, c: 3, d: 40, e: 50}

const letters = ['b', 'c', 'd']
const newLetters = ['a', ...letters, 'e']
console.log(letters) // ['b', 'c', 'd']
console.log(newLetters) // ['a', 'b', 'c', 'd', 'e']
            </code></pre>
          </section><!-- Spread Operator -->


          <!-- Destructuring -->
          <section>
            <h3>Destructuring</h3>

            <pre><code class="hljs" data-trim contenteditable>
const numbers = [10, 20, 30, 40, 50]
const [first, ...middle, last] = numbers
console.log(first, last) // 10, 50
console.log(middle) // [20, 30, 40]

const position = {lat: 42, lng: 17, alt: 100}
const { lat, lng } = position
console.log(lat, lng) // 42, 17

const printLoc = ({lat, lng, alt}) => console.log(alt, lat, lng)
printLoc(position) // 100, 42, 17
            </code></pre>
          </section><!-- Destructuring -->

          <!-- Import/Export -->
          <section>
            <h3>Import/Export</h3>
            <pre><code class="hljs" data-trim contenteditable>
// Importing
// ES5
var React = require('react')
var Text = React.Text
var View = React.View

// ES6
import React, { Text, View } from 'react'
            </code></pre>
						<br />
            <pre><code class="hljs" data-trim contenteditable>
// Exporting
// ES5
modules.export = Model

// ES6
export { myFunc, name2, ..., nameN }
export default Model
export default function (…) {…} // also class
export default function name1(…) { … } // also class
            </code></pre>


          </section><!-- Import/Export -->

          <!-- Classes -->
          <section>
            <h3>Classes</h3>
            <ul>
              <li>Somewhat controversial ¯\_(ツ)_/¯</li>
            </ul>

            <pre><code class="hljs" data-trim contenteditable>
// ES5
function Hello(name) {
  this.name = name
  this.hello = function hello() {
    return 'Hello' + this.name
  }
}

// ES6
class Hello {
  constructor(name) {
    this.name = name
  }
  hello() {
    return 'Hello ' + this.name
  }
}
            </code></pre>
          </section><!-- Classes -->

          <!-- Generators -->
          <section>
            <h3>Generator functions</h3>
            <ul>
              <li>A "pausable" function.</li>
              <li>Use <code>yield</code> to return a generator object</li>
              <li>Calling gen.next() returns next object</li>
            </ul>

            <pre><code class="hljs" data-trim contenteditable>
function* idMaker(){
  let index = 0
  while(index < 3) {
    yield index++
  }
  return 'No more ids'
}

const genObj = idMaker()

genObj.next() // {done: false, value: 1}
genObj.next() // {done: false, value: 2}
genObj.next() // {done: false, value: 3}
genObj.next() // {done: true, value: 'No more ids'}
            </code></pre>
          </section><!-- Generators -->


          <!-- Generators -->
          <section>
            <h3>Generator functions (cont.)</h3>
            <ul>
              <li class="fragment">Q: So... why do this?</li>
              <li class="fragment">A: You can write async code in a synchronous fashion(!)</li>
            </ul>
            <pre class="fragment"><code class="hljs" data-trim contenteditable>
function* getRecentUsernames() {
  const items = yield fetchRecentItems()
  const authors = items.map(i => i.author)
  const [ users, profiles ] = yield [
    fetchUsers(authors),
    fetchProfiles(authors),
  ]
  return { users, profiles }
}
console.log(genWrapper(getRecentUsernames))
            </code></pre>
          </section><!-- Generators -->

          <!-- Async Functions -->
          <section>
            <h3>Async Functions</h3>
            <ul>
              <li>Does same as generators, but without wrapper</li>
            </ul>
            <pre><code class="hljs" data-trim contenteditable>
async function getRecentUsernames() {
  const items = await fetchRecentItems()
  const authors = items.map(i => i.author)
  const [ users, profiles ] = await Promise.all([
    fetchUsers(authors),
    fetchProfiles(authors)
  ])
  return { users, profiles }
}

console.log(getRecentUsernames())
            </code></pre>
          </section><!-- Async Functions -->

        </section> <!-- End of ES6 -->

<!-- ====== React Fundamentals ==== -->
        <!-- React Fundamentals -->
        <section>
          <!-- Overview -->
          <section>
            <h2 style="color: #1b91ff;">React Fundamentals</h2>
            <ul>
              <li class="fragment">Facebook library for building user interfaces.</li>
              <li class="fragment">The "V" in MVC</li>
              <li class="fragment">Simplifies ui to: <code>(state) => ui</code></li>
							<li class="fragment">Uses Virtual DOM to calculate minimal number of DOM changes necessary, then does them.</li>
							<li class="fragment">Encourages nested components.</li>
							<li class="fragment">One-way data binding. Predictible == Easy to Test</li>
            </ul>
          </section><!-- Overview -->


          <!-- Nesting components -->
					<section>
            <h3>Nesting components</h3>
            <img
							src="http://i.imgur.com/jO98BOz.png"/>
          </section><!-- Nesting components -->


					<!-- Representing the DOM -->
					<section>
            <img
							src="http://teropa.info/images/onchange_vdom_initial.svg"
							style="background: white;" />
						<pre><span style="font-size: 9px;">Source: http://teropa.info/blog/2015/03/02/change-and-its-detection-in-javascript-frameworks.html</span></pre>
          </section><!-- Representing the DOM -->


					<!-- DOM change -->
					<section>
            <img
							src="http://teropa.info/images/onchange_vdom_change.svg"
							style="background: white;">
						<pre><span style="font-size: 9px;">Source: <a
							href="http://teropa.info/blog/2015/03/02/change-and-its-detection-in-javascript-frameworks.html">
								http://teropa.info/blog/2015/03/02/change-and-its-detection-in-javascript-frameworks.html</a>
						</span></pre>
          </section><!-- DOM change -->

          <!-- JSX example -->
          <section>
            <h3>JSX Example</h3>
            <img
							src="http://i.imgur.com/aJVFL2R.png"
            />
          </section><!-- JSX example -->


          <!-- JSX transpiled -->
          <section>
            <h3>Transpiled JSX</h3>
            <img
							src="http://i.imgur.com/Q50EOcO.png"
            />
          </section><!-- JSX transpiled -->


          <!-- 3 ways to write React components (func vs createClass vs class) -->
          <section>
            <h4>3 ways to write React Components</h4>
            <img
              src="http://i.imgur.com/NBUhJzL.png"
            />
          </section><!-- 3 ways to write React components (func vs createClass vs class) -->

        </section><!-- React Fundamentals -->

<!-- ====== React Native ==== -->
        <!-- React Native -->
        <section>
          <!-- Overview -->
          <section>
            <h2 style="color: #1b91ff;">React Native</h2>
          </section><!-- Overview -->

          <!-- React Native is just React for Mobile -->
          <section>
            <h3>React Native: just React for mobile</h3>
            <img
							src="http://i.imgur.com/NjZYalF.png"
            />
          </section><!-- React Native is just React for Mobile -->

          <!-- React vs React Native nodes -->
          <section>
            <h3>HTML vs Native nodes</h3>
            <img
  						src="http://i.imgur.com/OaAUOIE.png"
            />
          </section><!-- React vs React Native nodes -->

          <!-- Styling in React Native -->
          <section>
            <h3>Styling in React Native</h3>
            <img
							src="http://i.imgur.com/5DB5CYP.png"
            />
          </section><!-- Styling in React Native -->

          <!-- Peter Griffin CSS -->
          <section>
            <img
  						src="http://i.imgur.com/Q3cUg29.gif"
            />
          </section><!-- Peter Griffin CSS -->


          <!-- Styling: Flexbox -->
          <section>
            <h3>Styling: Flexbox</h3>
            <img
							src="http://i.imgur.com/YZghAFo.jpg"
            />
          </section><!-- Styling: Flexbox -->

          <!-- Chrome Debugger -->
          <section>
            <h3>Chrome Debugger: Just like web dev</h3>
            <img
              height="600"
              width="600"
							src="http://i.imgur.com/DWGZVKx.jpg"
            />
          </section><!-- Chrome Debugger -->

          <!-- Hot Reloading -->
          <section>
            <h3>Hot Reloading</h3>
            <p>(Demo)</p>
          </section><!-- Hot Reloading -->

        </section><!-- React Native -->

<!-- ====== Redux ==== -->
        <!-- Redux -->
        <section>
          <!-- Overview -->
          <section>
            <h2 style="color: #17ff2e;">Redux</h2>
            <ul>
              <li class="fragment">State management library we use for React Native</li>
              <li class="fragment">NOT an MVC style. Functional Programing paradigm</li>
              <li class="fragment">Most popular library for React/RN (even more than FB's own Flux)</li>
              <li class="fragment">Three easy pieces:
                <ul>
                  <li class="fragment"><strong>Store</strong>: One source of truth for app <em>(Big ol' JS object)</em></li>
                  <li class="fragment"><strong>Actions</strong>: Events/user interactions that change app <em>(JS objects).</em></li>
                  <li class="fragment"><strong>Reducers</strong>: Transforms current state into new state <em>(Pure JS function)</em></li>
                </ul>
              </li>
            </ul>
          </section><!-- Overview -->


          <!-- Redux Flow -->
          <!-- <section>
            <img src="http://i.imgur.com/y1vWR5L.png">
          </section> -->
          <!-- Redux Flow -->

          <!-- Redux Diagram -->
          <!-- <section>
             <img src="https://cdn-images-1.medium.com/max/800/1*U5IJvpfOF0-A4TVk9L8dIw.png">
          </section> -->
          <!-- Redux Diagram -->

          <!-- Redux Simple Diagram -->
          <!-- <section>
             <img src="https://camo.githubusercontent.com/83fef7601c50c8b025953579e5c5be3aa47ee51d/687474703a2f2f692e696d6775722e636f6d2f30756e68744e512e6a7067">
          </section> -->
          <!-- Redux Simple Diagram -->


          <!-- Medium "Rethinking Redux" article -->
          <!-- <section>
             <img src="https://d262ilb51hltx0.cloudfront.net/max/800/1*MKL1Im4ElgB38_MsubiMjw.png">
          </section> -->
          <!-- Medium "Rethinking Redux" article -->
          <!-- source: https://voice.kadira.io/rethinking-redux-f1e96daba60c#.nlkz7g34a -->

          <!-- Store -->
          <section>
            <h3>Store</h3>
            <ul>
              <li>Holds global app state</li>
              <li>React components subscribe to Store and re-render when state changes</li>
            </ul>

            <pre><code class="hljs" data-trim contenteditable>
{
  newsfeed: {
    items: [item1, item2, ...],
    error: '',
    loading: false
  },
  composeItem: {
    body: '...',
    nbhds: [],
  },
  global: {
    user: {
      username: 'user1'
    }
  },
  (...)
}
            </code></pre>

          </section><!-- Store -->

          <!-- Actions -->
          <section>
            <h3>Actions</h3>
            <ul>
              <li>Represents any event that can change state.<ul>
                <li>(user actions, server responses, etc.)</li>
              </ul></li>
              <li>Simple JavaScript objects (must have a "type" property)</li>
            </ul>

            <pre><code class="hljs" data-trim contenteditable>
{
  type: 'SELECTED_ITEM',
  itemId: 123
}

{
  type: 'NEWSFEED_LOADED',
  items: [item1, item2, ...]
}
            </code></pre>
          </section><!-- Actions -->

          <!-- Reducers -->
          <section>
            <h3>Reducers</h3>
            <ul>
              <li><em>Only</em> way app state in the Store can change.</li>
              <li><code>(currentState, newAction) -> newState</code></li>
							<li>Pure function that takes old state + action and emits a new state</li>
            </ul>
						<br/>
						<br/>
            <pre><code class="hljs" data-trim contenteditable>
function itemsReducer(state = initialState, action = {}) {
  switch (action.type) {
    case 'FAV_ITEM':
      const { itemId } = action
      return {
        ...state,
        items: state.items.map(i =>
                        i.id === itemId ? favItem(i) : i)
      }
    default:
      return state
  }
}
            </code></pre>
          </section><!-- Reducers -->

          <!-- Tim's Gliffy Diagram -->
          <section>
             <img src="http://i.imgur.com/3ZIphJh.png">
          </section><!-- Tim's Gliffy Diagram -->

          <!-- Bonus piece: Middleware -->
          <section>
            <h3>Bonus piece: Middleware</h3>
            <ul>
							<li class="fragment">Optional. Sit between actions and reducers</li>
              <li class="fragment">Allow actions to be changed/delayed/stopped before hitting reducers</li>
              <li class="fragment">Examples of middleware: <ul>
                <li class="fragment">redux-promise - Resolves any promises in Actions before reducing</li>
                <li class="fragment">redux-logger - Logs new actions to console</li>
                <li class="fragment">redux-thunk - executes</li>
              </ul></li>
            </ul>
						<br/>
						<br/>
          </section>
          <!-- Bonus piece: Middleware -->
        </section><!-- Redux -->

        <!-- THE END -->
        <section>
          <h1>THE End</h1>
        </section><!-- THE END -->

<!-- ====== Redux ==== -->

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