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Commit 0fcb65f

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‎.gitignore

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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
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# dependencies
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/node_modules
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# testing
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/coverage
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# production
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/build
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# misc
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.DS_Store
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.env.local
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.env.development.local
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.env.test.local
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.env.production.local
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*

‎.prettierrc

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{
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"semi": true,
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"trailingComma": "all",
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"singleQuote": true,
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"printWidth": 70
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}

‎README.md

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# react-hooks-introduction
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[![Build Status](https://travis-ci.org/the-road-to-learn-react/react-hooks-introduction.svg?branch=master)](https://travis-ci.org/the-road-to-learn-react/react-hooks-introduction) [![Slack](https://slack-the-road-to-learn-react.wieruch.com/badge.svg)](https://slack-the-road-to-learn-react.wieruch.com/)
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Showcasing popular React Hooks in function components such as useState, useEffect and custom hooks. [Read more about it.](https://www.robinwieruch.de/react-hooks/)
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## Installation
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* `git clone git@github.com:the-road-to-learn-react/react-hooks-introduction.git`
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* cd react-hooks-introduction
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* npm install
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* npm start
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* visit `http://localhost:3000`

‎package-lock.json

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‎package.json

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{
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"name": "react-hooks-introduction",
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"version": "0.1.0",
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"private": true,
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"dependencies": {
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"axios": "^0.18.0",
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"react": "^16.7.0-alpha.0",
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"react-dom": "^16.7.0-alpha.0",
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"react-scripts": "2.0.5"
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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": "react-app"
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},
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"browserslist": [
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">0.2%",
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"not dead",
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"not ie <= 11",
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"not op_mini all"
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]
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}

‎public/favicon.ico

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‎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="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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<meta name="theme-color" content="#000000">
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<!--
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manifest.json provides metadata used when your web app is added to the
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homescreen on Android. 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>
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You need to enable JavaScript to run this app.
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</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>

‎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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"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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}

‎src/customHook-example/index.js

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import React, { useState, useEffect } from 'react';
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function useOffline() {
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const [isOffline, setIsOffline] = useState(false);
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function onOffline() {
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setIsOffline(true);
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}
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function onOnline() {
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setIsOffline(false);
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}
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useEffect(() => {
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window.addEventListener('offline', onOffline);
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window.addEventListener('online', onOnline);
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return () => {
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window.removeEventListener('offline', onOffline);
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window.removeEventListener('online', onOnline);
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};
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}, []);
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return isOffline;
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}
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function App() {
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const isOffline = useOffline();
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if (isOffline) {
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return <div>Sorry, you are offline ...</div>;
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}
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return <div>You are online!</div>;
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}
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export default App;

‎src/customHook-example/test.js

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import React from 'react';
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import ReactDOM from 'react-dom';
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import App from './';
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it('renders without crashing', () => {
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const div = document.createElement('div');
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ReactDOM.render(<App />, div);
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ReactDOM.unmountComponentAtNode(div);
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});

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