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svwoodhousesvwoodhouse
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add custom react hook
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‎Sections/Section 15/01-starting-project/package-lock.json

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‎Sections/Section 15/01-starting-project/package.json

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{
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"name": "react-complete-guide",
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"version": "0.1.0",
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"private": true,
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"dependencies": {
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"@testing-library/jest-dom": "^5.11.6",
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"@testing-library/react": "^11.2.2",
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"@testing-library/user-event": "^12.5.0",
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"react": "^18.0.0",
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"react-dom": "^18.0.0",
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"react-scripts": "^5.0.1",
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"web-vitals": "^0.2.4"
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},
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"scripts": {
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"start": "react-scripts start",
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"build": "react-scripts build",
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"test": "react-scripts test",
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"eject": "react-scripts eject"
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},
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"eslintConfig": {
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"extends": [
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"react-app",
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"react-app/jest"
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]
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},
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"browserslist": {
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"production": [
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">0.2%",
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"not dead",
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"not op_mini all"
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],
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"development": [
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"last 1 chrome version",
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"last 1 firefox version",
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"last 1 safari version"
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]
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}
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}

‎Sections/Section 15/01-starting-project/public/favicon.ico

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‎Sections/Section 15/01-starting-project/public/index.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<meta name="theme-color" content="#000000" />
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<meta
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name="description"
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content="Web site created using create-react-app"
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/>
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<link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
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<!--
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manifest.json provides metadata used when your web app is installed on a
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user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/
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-->
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<link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
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<!--
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Notice the use of %PUBLIC_URL% in the tags above.
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It will be replaced with the URL of the `public` folder during the build.
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Only files inside the `public` folder can be referenced from the HTML.
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Unlike "/favicon.ico" or "favicon.ico", "%PUBLIC_URL%/favicon.ico" will
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work correctly both with client-side routing and a non-root public URL.
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Learn how to configure a non-root public URL by running `npm run build`.
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-->
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<title>React App</title>
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</head>
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<body>
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<noscript>You need to enable JavaScript to run this app.</noscript>
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<div id="root"></div>
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<!--
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This HTML file is a template.
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If you open it directly in the browser, you will see an empty page.
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You can add webfonts, meta tags, or analytics to this file.
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The build step will place the bundled scripts into the <body> tag.
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To begin the development, run `npm start` or `yarn start`.
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To create a production bundle, use `npm run build` or `yarn build`.
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-->
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</body>
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</html>

‎Sections/Section 15/01-starting-project/public/logo192.png

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‎Sections/Section 15/01-starting-project/public/logo512.png

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‎Sections/Section 15/01-starting-project/public/manifest.json

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{
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"short_name": "React App",
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"name": "Create React App Sample",
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"icons": [
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{
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"src": "favicon.ico",
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"sizes": "64x64 32x32 24x24 16x16",
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"type": "image/x-icon"
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},
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{
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"src": "logo192.png",
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"type": "image/png",
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"sizes": "192x192"
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},
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{
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"src": "logo512.png",
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"type": "image/png",
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"sizes": "512x512"
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}
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],
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"start_url": ".",
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"display": "standalone",
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"theme_color": "#000000",
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"background_color": "#ffffff"
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}

‎Sections/Section 15/01-starting-project/public/robots.txt

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# https://www.robotstxt.org/robotstxt.html
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User-agent: *
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Disallow:

‎Sections/Section 15/01-starting-project/src/App.js

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import React from 'react';
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import BackwardCounter from './components/BackwardCounter';
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import ForwardCounter from './components/ForwardCounter';
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function App() {
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return (
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<React.Fragment>
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<ForwardCounter />
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<BackwardCounter />
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</React.Fragment>
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);
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}
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export default App;

‎Sections/Section 15/01-starting-project/src/components/BackwardCounter.js

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import useCounter from '../hooks/use-counter';
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import Card from './Card';
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const BackwardCounter = () => {
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const counter = useCounter(false);
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return <Card>{counter}</Card>;
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};
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export default BackwardCounter;

‎Sections/Section 15/01-starting-project/src/components/Card.js

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import classes from './Card.module.css';
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const Card = (props) => {
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return <div className={classes.card}>{props.children}</div>;
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};
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export default Card;

‎Sections/Section 15/01-starting-project/src/components/Card.module.css

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.card {
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max-width: 40rem;
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margin: 3rem auto;
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background-color: white;
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padding: 1rem;
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border-radius: 12px;
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box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
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text-align: center;
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font-size: 2.5rem;
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font-weight: bold;
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}

‎Sections/Section 15/01-starting-project/src/components/ForwardCounter.js

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import useCounter from '../hooks/use-counter';
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import Card from './Card';
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const ForwardCounter = () => {
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const counter = useCounter();
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return <Card>{counter}</Card>;
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};
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export default ForwardCounter;

‎Sections/Section 15/01-starting-project/src/hooks/use-counter.js

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import {useEffect, useState} from 'react'
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const useCounter = (forwards = true) => {
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const [counter, setCounter] = useState(0);
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useEffect(() => {
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const interval = setInterval(() => {
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if(forwards){setCounter((prevCounter) => prevCounter + 1);}
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else {setCounter((prevCounter) => prevCounter - 1);}
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}, 1000);
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return () => clearInterval(interval);
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}, [forwards]);
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return counter
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}
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export default useCounter

‎Sections/Section 15/01-starting-project/src/index.css

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@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;700&display=swap');
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* {
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box-sizing: border-box;
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}
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html {
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font-family: 'Noto Sans JP', sans-serif;
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}
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body {
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margin: 0;
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background-color: #3f3f3f;
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}
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‎Sections/Section 15/01-starting-project/src/index.js

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import ReactDOM from 'react-dom/client';
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import './index.css';
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import App from './App';
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const root = ReactDOM.createRoot(document.getElementById('root'));
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root.render(<App />);

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