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<!DOCTYPE html>
<html>
<head>
<meta name="ROBOTS" content="INDEX, FOLLOW" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="description" content="Formation React js, avec ES6" />
<meta
name="keywords"
content="formation react, formation reactjs, freelance, flux, redux, es6, props, state, jsx"
/>
<link rel="canonical" href="https://formation-reactjs.fr" />
<title>Formation reactjs x typescript</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<link rel="stylesheet" href="reveal/reset.css" />
<link rel="stylesheet" href="reveal/reveal.css" />
<link rel="stylesheet" href="reveal/theme/sky.css" id="theme" />
<!-- Theme used for syntax highlighting of code -->
<link rel="stylesheet" href="reveal/plugin/highlight/monokai.css" id="highlight-theme" />
<style type="text/css">
p {
text-align: left;
}
.reveal h3,
.reveal h4 {
text-transform: none;
}
.reveal pre code {
max-height: 530px;
}
</style>
</head>
<body>
<div class="reveal">
<div class="slides">
<section>
<h1>
<img
width="105px"
height="auto"
data-src="images/react.svg"
alt="react"
style="border: none; background: none; box-shadow: none; margin: 0"
/>React
</h1>
<h3>#Typescript</h3>
<p style="text-align: center"><a target="_blank" href="http://twitter.com/jbcazaux">@jbcazaux</a></p>
<a href="https://www.netlify.com">
<img
src="https://www.netlify.com/img/global/badges/netlify-color-bg.svg"
alt="Deploys by Netlify"
style="border: none; background: none; box-shadow: none; margin: 0; float: right"
/>
</a>
</section>
<section data-visibility="hidden"><img data-src="images/mynameis.jpg" alt="my name is" /></section>
<section data-visibility="hidden"><img data-src="images/coffee.gif" alt="coffee break" /></section>
<section data-visibility="hidden">
<h3>Objectifs</h3>
<img data-src="images/postits.jpg" alt="goals" />
</section>
<section>
<h3>Versions</h3>
<pre>
<code data-trim>
"react": "18.2.0"
"typescript": "4.8.4"
</code>
</pre>
</section>
<section>
<h3>Le programme !</h3>
<ul>
<li>
Typescript avancé
<ul>
<li>Typescript</li>
<li>Programmation fonctionnelle</li>
</ul>
</li>
<li>
ReactJS
<ul>
<li>Principes de base</li>
<li>Composants</li>
<li>Gestion de la donnée</li>
<li>Redux</li>
<li>Tests</li>
<li>Routing</li>
<li>Optimisations</li>
</ul>
</li>
</ul>
</section>
<section>
<h2>Typescript</h2>
</section>
<section>
<h3>let, const</h3>
<pre><code data-trim>
let foo = 'bar'
const MAX = 10
const ttc = addTva(100, 20)
</code></pre>
<p class="fragment">
<span style="color: #8cd0d3">let</span> vs. <span style="color: #cc9393">const</span> ?
<span class="fragment">0-5 let / application</span>
</p>
</section>
<section>
<h3>let, const</h3>
<pre><code data-trim>
const user = {}
user.name = 'john' // (1)
user = {name: 'lea'} // (2)
</code></pre>
<pre class="fragment fade-up"><code data-trim>
const arr = ['a']
arr.push('b') // (3)
arr = ['a', 'b'] // (4)
</code></pre>
</section>
<section>
<h3>Arrow functions</h3>
<pre><code data-trim>
function addOldSchool(a: number, b: number): number {
return a + b
}
</code></pre>
<pre class="fragment"><code data-trim>
const add = (a:number, b: number): number => {
return a + b
}
</code></pre>
<pre class="fragment"><code data-trim>
const add = (a:number, b: number): number => a + b
</code></pre>
</section>
<section>
<h3>Arrow functions</h3>
<pre><code data-trim>
const squares = [0, 1, 2, 3, 4].map(x => x * x)
console.log(squares)
</code></pre>
</section>
<section>
<h3>Spread operator</h3>
<pre><code data-trim>
const user = {
firstname: 'john',
nickname: 'ninja',
lastname: 'doe',
age: 21
}
const updatedUser = {...user, firstname: 'toto'}
console.log(updatedUser) // ?
</code></pre>
</section>
<section data-auto-animate data-visibility="hidden">
<h3 data-id="code-title">Spread operator</h3>
<pre data-id="code-animation"><code class="hljs" data-trim>
const odd = [1, 3, 5, 7, 9]
const even = [2, 4, 6, 8]
const all = [0]
// arr.push([element1[, ...[, elementN]]])
all.push(odd)
all.push(even)
console.log(all) // ?
</code></pre>
</section>
<section data-auto-animate data-visibility="hidden">
<h3 data-id="code-title">Spread operator</h3>
<pre data-id="code-animation"><code class="hljs" data-trim>
const odd = [1, 3, 5, 7, 9]
const even = [2, 4, 6, 8]
const all = [0]
// arr.push([element1[, ...[, elementN]]])
for (let i = 0; i < odd.length; i++) {
all.push(odd[i])
}
for (let i = 0; i < even.length; i++) {
all.push(even[i])
}
console.log(all) // ?
</code></pre>
</section>
<section data-auto-animate>
<h3 data-id="code-title">Spread operator</h3>
<pre data-id="code-animation">
<code class="hljs" data-trim>
const odd: ReadonlyArray<number> = [1, 3, 5, 7, 9]
const even: ReadonlyArray<number> = [2, 4, 6, 8]
const all: ReadonlyArray<number> = [0, ...odd, ...even]
</code>
</pre>
</section>
<section data-visibility="hidden">
<h3>Immutabilité !</h3>
<p>Ne mutez pas pendant la formation, s'il vous plaît.</p>
</section>
<section data-auto-animate data-visibility="hidden">
<h3>Éviter les mutations</h3>
<pre data-id="immutability">
<code class="hljs" data-trim>
const defaultValues = [{money: 100}, {level: 0}]
const defaultLevel = defaultValues[1]
const newPlayer = {name: 'player1', data: defaultLevel}
newPlayer.data.level = 2
const newPlayer2 = {name: 'player2', data: defaultLevel}
console.log(newPlayer2) // ?
</code></pre>
</section>
<section data-auto-animate data-visibility="hidden">
<h3>Éviter les mutations</h3>
<pre data-id="immutability">
<code class="hljs" data-trim>
const defaultValues = [{money: 100}, {level: 0}]
const defaultLevel = defaultValues[1]
const newPlayer = {name: 'player1', data: defaultLevel}
const newPlayerUpdated = {...newPlayer, data: {level : 2}}
</code></pre>
</section>
<section>
<h3>Destructuring</h3>
<pre><code data-trim>
const foo = {a: 1, b: 2, c: 'bar'}
const {a} = foo
console.log(a) // ?
</code></pre>
</section>
<section>
<h3>Destructuring</h3>
<pre><code data-trim>
const user: User = {
firstname: 'john',
nickname: 'ninja',
lastname: 'doe',
age: 21
}
function getUserName(user: User) {
return `${user.firstname} ${user.lastname}`
}
console.log(getUserName(user))
</code></pre>
<pre class="fragment"><code data-trim>
function getUserName({firstname, lastname}: User) {
return `${firstname} ${lastname}`
}
</code></pre>
<pre class="fragment"><code data-trim>
const getUserName = ({firstname, lastname}: User) =>
`${firstname} ${lastname}`
</code></pre>
</section>
<section>
<h3>Destructuring - nested</h3>
<pre><code data-trim>
const user: User = {
firstname: 'john',
lastname: 'doe',
address: {
street: 'avenue des champs élysées',
num: '12'
}
}
function getUserAddress(user: User) {
return `${user.address.num} ${user.address.street}`
}
</code></pre>
<pre class="fragment"><code data-trim>
const getUserAddress = ({address: {num, street}}: User) =>
`${num} ${street}`
</code></pre>
</section>
<section>
<h3>Destructuring - alias</h3>
<pre><code data-trim>
const user: User = {
firstname: 'john',
lastname: 'doe',
address: {
street: 'avenue des champs élysées',
num: '12'
}
}
const getUserAddress = ({address: {num: foo, street: bar}}: User) =>
`${foo} ${bar}`
</code></pre>
</section>
<section>
<h3>Destructuring - arrays</h3>
<pre><code data-trim>
const maths = [x => x + 1, x => x * x, x => x * x * x]
const [plus1, square] = maths
plus1(41) // 42
square(12) // 144
</code></pre>
</section>
<section>
<h3>Shorthand Notation</h3>
<pre><code data-trim>
const foo = 42
const bar = 1
const longer = {
foo: foo,
bar: bar
}
</code></pre>
<pre class="fragment"><code data-trim>
const shorter = {
foo,
bar
}
</code></pre>
</section>
<section>
<h3>Promesses VS. async - await</h3>
<pre><code data-trim>
axios.get('/users/42/items')
.then(resp => resp.data)
.then(items => items.map(item => item.id))
.then(ids => {/* use the ids */})
.catch(error => console.log(error.toString()))
</code></pre>
<pre class="fragment"><code data-trim>
const fetchItems = async () => {
try {
const response = await axios.get('/users/42/items')
const items = response.data
const itemIds = items.map(item => item.id))
/* use the ids */
} catch(error){
console.log(error.toString())
}
}
</code></pre>
</section>
<section>
<h3>Promesses VS. async - await</h3>
<pre><code data-trim>
axios.get('/users/42/items')
.then(({data : items}) => items.map(item => item.id))
.then(ids => {/* use the ids */})
.catch(error => console.log(error.toString()))
</code></pre>
<pre><code data-trim>
const fetchItems = async () => {
try {
const {data: items} = await axios.get('/users/42/items')
const itemIds = items.map(item => item.id))
/* use the ids */
} catch(error){
console.log(error.toString())
}
}
</code></pre>
</section>
<section>
<h3>Rappels - currying</h3>
<pre><code data-trim>
const add = function(x) {
return function(y) {
return x + y
}
}
add(2)(3) // ???
</code></pre>
<pre class="fragment"><code data-trim>
const add2 = add(2)
add2(3) // = ?
</code></pre>
<pre class="fragment"><code data-trim>
const add = x => y => x + y // WTF ?!
</code></pre>
<pre class="fragment"><code data-trim>
const add = x =>
y => (x + y)
// easy !
</code></pre>
</section>
<section>
<h3>Rappels - this</h3>
<pre><code data-trim data-noescape>
function f() {
this.foo // what is this ?
}
</code></pre>
</section>
<section>
<h1>
<img
width="200"
height="200"
data-src="images/react.svg"
alt="react"
style="border: none; background: none; box-shadow: none; margin: 0"
/>
</h1>
</section>
<section>
<h3>Tout est composant</h3>
<img data-src="images/components.png" alt="components" width="90%" />
</section>
<section>
<h3>Hello world</h3>
<pre>Hello.tsx<code data-trim>
interface Props {
name: string
}
const Hello = (props: Props) => <div>Hello {props.name} !</div>
export default Hello
</code></pre>
<pre class="fragment">index.tsx<code class="jsx" data-trim>
import { createRoot } from 'react-dom/client'
import Hello from "./Hello"
const container = document.getElementById('root')!
const root = createRoot(container)
root.render(<Hello name="world" />)
</code></pre>
</section>
<section>
<h3>JSX</h3>
<pre><code data-trim>
(props: Props) => (
<li className="contact">
<h2 className="contact-name">{props.name}</h2>
</li>
)
</code></pre>
<pre><code data-trim>
(props: Props) => React.createElement('li', {className: 'contact'},
React.createElement('h2',
{className: 'contact-name'}, props.name)
)
)
</code></pre>
</section>
<section data-background="#DEE6F7">
<h3>TP-01</h3>
<h4>Hello World</h4>
<ol>
<li>Installer l'environnement</li>
<li>Ecrire le composant Hello</li>
</ol>
</section>
<section>
<h3>Attributs dans les composants</h3>
<pre><code data-trim>
const Counter = () => {
let count = 0
return <div onClick={() => count = count + 1}>
Count: {count}
</div>
}
</code></pre>
<mark>Don't try this at home !</mark>
</section>
<section>
<h3>State</h3>
<pre><code data-trim>
const ComponentWithState = (props) => {
const [count, setCount] = useState<number>(0)
const [user, setUser] = useState<User | null>(null)
const [color, setColor] = useState<string>('green')
return ...
}
</code></pre>
</section>
<section>
<h3>State</h3>
<p>Pour mettre un état par défaut, on passe un paramètre à useState()</p>
<pre><code data-trim>
const [count, setCount] = useState<number>(42)
</code></pre>
<p>Mettre à jour un état</p>
<pre><code data-trim>
const [count, setCount] = useState<number>(0)
setCount(10)
setCount(prevState => prevState + 1)
</code></pre>
<p>Récupérer l'état courant</p>
<pre><code data-trim>
const [count, setCount] = useState<number>(0)
count
</code></pre>
</section>
<section>
<h3>State</h3>
<pre><code data-trim>
const Counter = () => {
const [count, setCount] = useState<number>(0)
return <div onClick={() => setCount(prev => prev + 1)}>
Count: {count}
</div>
}
</code></pre>
</section>
<section>
<h3>Props vs State</h3>
<p>Props</p>
<div style="font-size: 30px; text-align: left; margin-left: 50px">
<ul>
<li>Données passées par le composant parent</li>
</ul>
</div>
<p>State</p>
<div style="font-size: 30px; text-align: left; margin-left: 50px">
<ul>
<li>Données modifiées par l'utilisateur (clics, saisies, ...)</li>
<li>Données récupérées d'un web service</li>
<li>Faire un maximum de composants sans état</li>
<li><strike>Données dérivées des props </strike>(Faire ca dans le composant directement)</li>
<li><strike>Composants</strike></li>
</ul>
</div>
</section>
<section>
<h3>Class components</h3>
<pre><code data-trim>
class ButtonApp extends React.Component {
state = {count: 0}
render() {
return <div>
<div>{this.props.title}</div>
<button>{this.props.label}</button>
<div>{this.state.count}</div>
</div>
}
}
</code></pre>
</section>
<section>
<h3>Pourquoi les hooks ?</h3>
<ul>
<li>Réutiliser la logique entre les composants (sans HOC!)</li>
<li>
Composants trop complexes avec les méthodes du cycle de vie (duplication, symétrie cassée sur les
listeners)
</li>
<li>Difficile de lire les classes : this + bind</li>
<li>Classes se "minifient" mal, le hot reloading est instable</li>
</ul>
</section>
<section>
<h3>Itérer sur un tableau</h3>
<pre><code data-trim>
const MyComponent = (props: Props) => (
<ul>
{
props.items.map(item =>
<li key={item.id}>{item.label}</li>)
}
</ul>
)
</code></pre>
</section>
<section>
<h3>useEffect</h3>
<p>Déclenche un traitement lorsque des données (issues des props ou des states) changent</p>
<pre><code data-trim>
const UserDetails = ({userId}: Props) => {
const [details, setDetails] = useState<User | null>(null)
useEffect(() => {
axios.get<ReadonlyArray<User>>('/users/' + userId)
.then(({data})) => setDetails(data)
}, [userId])
return <div>...
}
</code></pre>
</section>
<section data-background="#DEE6F7">
<h3>TP-02</h3>
<h4>Shopping list</h4>
<ol style="font-size: 34px">
<li>Afficher le titre passé par le parent</li>
<li>Mettre un état par défaut (liste vide)</li>
<li>Mettre la liste des items retournée par l'appel au web service</li>
<li>Afficher les items dans une liste <ul></ul></li>
<li>Créer un composant dédié pour chaque élément de la liste <li></li>
<li>
Bonus: Créer un composant qui fait l'appel ajax, et passe le résultat à un composant enfant, qui lui itère
sur la liste.
</li>
</ol>
</section>
<section>
<h3>Bonus TP-02</h3>
<pre><code data-trim>
const ShoppingList = ({title}: Props) => {
const [items, setItems] = useState<ReadonlyArray<Item>>([])
// useEffect({...}, [])
return <ShoppingListInternal title={title}
items={items}/>
}
const ShoppingListInternal = ({title, items}: Props) =>
<div>
<h2>{title}</h2>
<ul>{items.map(item =>
<ShoppingItem key={item.id} item={item}/>)}
</ul>
</div>
</code></pre>
</section>
<section>
<h3>Passer des fonctions dans les props</h3>
<pre><code data-trim>
const ShoppingList = ({title}: Props) => {
const [items, setItems] = useState<ReadonlyArray<User>>([])
// useEffect({...}, [])
const deleteItem = (itemIdToDelete: number) => {
setItems(prev =>
prev.filter(item => item.id !== itemIdToDelete)
)
}
return (<ShoppingListInternal
title={title}
items={items}
del={deleteItem}/>)
}
}
</code></pre>
</section>
<section>
<h3>Utiliser les fonctions des props</h3>
<pre><code data-trim>
const ShoppingListInternal = ({title, items, del}: Props) => (
<div>
<h2>{title}</h2>
<ul>
{
items.map(item => (<li
onClick={() => del(item.id)}
key={item.id}
>
{item.label}: {item.price}€
</li>))
}
</ul>
</div>)
</code></pre>
</section>
<section>
<h3>Récupérer l'évènement JS</h3>
<pre><code data-trim>
const ClickableApp = () => {
const handleClick = (e: React.MouseEvent<HTMLDivElement>) => {
console.log('click !', e)
}
return <div onClick={handleClick}>Click me !</div>
}
</code></pre>
<pre class="fragment"><code data-trim>
const ClickableApp = () => (
<div
onClick={(e: React.MouseEvent<HTMLDivElement>) =>
console.log('click !', e)}
>
Click me !
</div>
)
</code></pre>
</section>
<section>
<h3>Avec du style</h3>
</section>
<section>
<h3>inline style vs css</h3>
<p>Pourquoi ne pas inliner le css dans le js ?</p>
<pre><code data-trim>
MyComponent = () => {
const mystyle = {backgroundColor: '#F0ABCD'}
return <div style={mystyle}/>
}
</code></pre>
<p>Ou utiliser une css globale, une css par composant (css modules avec Webpack)</p>
<pre><code data-trim>
import './MyComponent.css'
</code></pre>
</section>
<section>
<h3>Ant Design</h3>
<div style="font-size: 30px; text-align: left; margin-left: 50px">
<p>React Components for desktop applications</p>
</div>
<pre><code data-trim>
<Button type="primary" onClick={handleClick}>Go!</Button>
</code></pre>
<div style="font-size: 30px; text-align: left; margin-left: 50px">
<p>Documentation</p>
<p>
<a target="_blank" href="https://ant.design/docs/spec/introduce">
https://ant.design/docs/spec/introduce
</a>
</p>
</div>
</section>
<section>
<h3>Material-UI</h3>
<div style="font-size: 30px; text-align: left; margin-left: 50px">
<p>React components that implement Google's Material Design</p>
</div>
<pre><code data-trim>
<Button onClick={handleClick}>Go!</Button>
</code></pre>
<div style="font-size: 30px; text-align: left; margin-left: 50px">
<p>Documentation</p>
<p><a target="_blank" href="https://material-ui.com/api/button/">https://material-ui.com/api/button/</a></p>
</div>
</section>
<section>
<h3>Styled-Components</h3>
<div style="font-size: 30px; text-align: left; margin-left: 50px">
<p>Visual primitives for the component age.</p>
</div>
<pre><code data-trim>
const Title = styled.h1`
font-size: 1.5em;
text-align: center;
color: palevioletred;
`
<Title>Nice title !</Title>
</code></pre>
<div style="font-size: 30px; text-align: left; margin-left: 50px">
<p>Documentation</p>
<p>
<a target="_blank" href="https://www.styled-components.com/docs/api"
>https://www.styled-components.com/docs/api</a
>
</p>
</div>
</section>
<section>
<h3>Tips and tricks</h3>
<h4 class="fragment">(Workarounds)</h4>
</section>
<section>
<h3>Fragments</h3>
<pre><code data-trim>
const ComponentWithFragment = () => (
<>
<div>Les</div>
<span>fragments</span>
</>
)
</code></pre>
</section>
<section>
<h3>JSX if (else)</h3>
<p>if</p>
<pre><code data-trim>
{user && <div>{user.login}</div>}
</code></pre>
<p>not</p>
<pre><code data-trim>
{user || <div>No User</div>}
</code></pre>
<p>if-else</p>
<pre><code data-trim>
{user
? <div>{user.login}</div>
: <div>No User</div>}
</code></pre>
<p>
<a href="https://angular.io/api/common/NgIf" style="font-size: 0.5em">Pas mieux en angular :)</a>
</p>
</section>
<section>
<h3>Commentaires</h3>
<pre><code data-trim>
const MyComponent = () => {
// comment inside JS
return <div>
{/* Comment inside JSX */}
</div>
}
</code></pre>
</section>
<section>
<h3>Children</h3>
<pre><code data-trim>
const container = document.getElementById('root')!
const root = createRoot(container)
root.render(
<ButtonApp title="My Application">Press Me! </ButtonApp>
)
</code></pre>
<pre><code data-trim>
export const ButtonApp = ({title, children}: Props) => {
return <div>
<div>{title}</div>
<button>{children}</button>
</div>
}
</code></pre>
</section>
<section data-background="#DEE6F7">
<h3>TP-03</h3>
<h4>Liste des étudiants</h4>
<ol>
<li>Créer un champ "input" qui filtre les éléments de la table</li>
<li>
Afficher le nom de l'étudiant sélectionné (Celui sur lequel on a cliqué), ou un message si aucun étudiant
n'est sélectionné (par défaut)
</li>
<li>Bonus : Faire une Pull Request pour faire une <b>jolie</b> correction à ce TP ;)</li>
</ol>
</section>
<section>
<h3>Ce qu'on a vu jusque là</h3>
<ul>
<li>Un composant a des props et des états (states)</li>
<li>Un composant sans états est plus simple à écrire (et donc plus maintenable)</li>
</ul>
</section>
<section>
<h3>Flux & Redux</h3>
</section>
<section>
<h3>Flux</h3>
<div style="font-size: 30px; text-align: left; margin-left: 15px">
<ul>
<li>Store: Stocker la donnée</li>
<li>Action: Mettre à jour le model</li>
<li>Dispatcher: Aiguiller les actions dans les stores</li>
<li>View: Composants UI</li>
</ul>
</div>
<img data-src="images/flux.png" alt="flux" />
<p>Le flux est <i>unidirectionel</i> ! (<strike>2-way binding</strike>)</p>
</section>
<section>
<h3>Bad Practice vs. Good Practice</h3>
<img data-src="images/flux-bestpractice.png" alt="best practices" height="300" />
<div style="font-size: 30px; text-align: left; margin-left: 15px">
<ul>
<li>On ne met pas à jour les composants directement</li>
<li>On peut utiliser le store (redux), les stores (flux), les services (RxJs Subjects ), ...</li>
</ul>
</div>
</section>
<section>
<h3>Redux</h3>
</section>
<section>
<h3>Redux</h3>
<pre><code data-trim>
const userId = window.current_account.id
</code></pre>
<p>« Pourquoi utiliser Redux alors qu'on a déjà les variables globales ? »</p>
<p class="fragment">#TROLL</p>
</section>
<section>
<h3>Actions</h3>
<pre><code data-trim>
{type: 'INCREMENT', inc: 3}
{type: 'ADD_TODO', text: 'Buy bread'}
{type: 'SET_USER', user: new User(1, 'toto')}
</code></pre>
<h3>Action Creator</h3>
<pre><code data-trim>
export const incrementor = (inc: number): IncAction => {
return {type: 'INCREMENT', inc}
}
</code></pre>
<pre><code data-trim>
export const incrementor =
(inc: number): IncAction => ({type: 'INCREMENT', inc})
</code></pre>
</section>
<section>
<h3>Redux</h3>
<div style="font-size: 30px; text-align: left; margin-left: 15px">
<ul>
<li>Store unique (plus simple pour l'isomorphisme / SSR)</li>
<li>Le <b>state</b> du store est read-only</li>
<li>On dispatch des <b>actions</b> pour mettre à jour le state (du store)</li>
<li class="fragment">Les <b>actions</b> sont envoyées aux <b>reducers</b></li>
<li class="fragment">Les <b>reducers</b> sont des fonctions <b>pures</b></li>
<li class="fragment">Les <b>reducers</b> prennent un état et une action en paramètre</li>
<li class="fragment">et retournent un nouvel état dans un objet 'immutable'</li>
</ul>
</div>
<img data-src="images/redux.png" alt="redux" height="200" />
</section>
<section>
<h3>Reducer</h3>
<pre><code data-trim>
export const counter = (state: number = 0, action: IncAction) => {
switch (action.type) {
case 'INCREMENT':
return state + action.inc
case 'DECREMENT':
return state - action.inc
default:
return state
}
}
</code></pre>
Le <b>state</b> est read-only !
<img data-src="images/redux.png" alt="redux" />
</section>
<section>
<h3>React & Redux</h3>
</section>
<section>
<h3>Composition de Reducers</h3>
<h4>Approche naïve</h4>
<pre><code data-trim>
const initialState: State = {user: '', counter: 0}
export const myGlobalReducer =
(state:State = initialState, action: Action): State => {
switch (action.type) {
case 'SET_USER':
return {...state, user: action.user}
case 'INCREMENT':
return {...state, counter: state.counter + 1}
case 'DECREMENT':
return {...state, counter: state.counter - 1}
default:
return state
}
}
</code></pre>
Pas vraiment lisible pour des applications moyennes ou grosses...!
</section>
<section>
<h3>Composition de reducers</h3>
<pre><code data-trim>
export const user =
(state:User|null = null, action: UserAction): User|null => {
switch (action.type) {
case 'SET_USER':
return action.user
default:
return state
}
}
export const counter =
(state:number = 0, action: IncAction): number => {
switch (action.type) {
case 'INCREMENT':
return state + 1
case 'DECREMENT':
return state - 1
default:
return state
}
}
</code></pre>
</section>
<section>
<h3>Composition de reducers</h3>
<pre><code data-trim>
import { combineReducers } from 'redux'
export const myGlobalReducer = combineReducers({
user,
counter
})
</code></pre>
</section>