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Adding Examples
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‎Sections/Section 10/01-starting-project/package-lock.json

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‎Sections/Section 10/01-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 10/01-starting-project/public/favicon.ico

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‎Sections/Section 10/01-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 10/01-starting-project/public/logo192.png

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‎Sections/Section 10/01-starting-project/public/logo512.png

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‎Sections/Section 10/01-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 10/01-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 10/01-starting-project/src/App.js

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import React, { useContext } from 'react';
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import Login from './components/Login/Login';
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import Home from './components/Home/Home';
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import MainHeader from './components/MainHeader/MainHeader';
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import AuthContext from './store/auth-context';
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function App() {
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const ctx = useContext(AuthContext)
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return (
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<React.Fragment>
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<MainHeader/>
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<main>
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{!ctx.isLoggedIn && <Login/>}
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{ctx.isLoggedIn && <Home />}
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</main>
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</React.Fragment> );
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}
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export default App;

‎Sections/Section 10/01-starting-project/src/components/Home/Home.js

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import React from 'react';
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import AuthContext from '../../store/auth-context';
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import { useContext } from 'react';
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import Card from '../UI/Card/Card';
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import classes from './Home.module.css';
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import Button from '../UI/Button/Button';
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const Home = () => {
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const authCtx = useContext(AuthContext)
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return (
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<Card className={classes.home}>
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<h1>Welcome back!</h1>
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<Button onClick={authCtx.onLogout}>Logout</Button>
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</Card>
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);
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};
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export default Home;

‎Sections/Section 10/01-starting-project/src/components/Home/Home.module.css

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.home {
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width: 90%;
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max-width: 40rem;
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padding: 3rem;
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margin: 2rem auto;
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text-align: center;
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}

‎Sections/Section 10/01-starting-project/src/components/Login/Login.js

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import React, { useContext, useEffect, useReducer, useState } from 'react';
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import Card from '../UI/Card/Card';
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import classes from './Login.module.css';
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import Button from '../UI/Button/Button';
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import AuthContext from '../../store/auth-context';
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import Input from '../UI/Input/Input';
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// For useReducer Example
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const emailReducer = (state, action) => {
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if(action.type === 'USER_INPUT') {
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return {value: action.val, isValid: action.val.includes('@')}
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}
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if(action.type === 'INPUT_BLUR') {
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return {value: state.value, isValid: state.value.includes('@')}
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}
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return {value:'', isValid: false}
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}
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const passwordReducer = (state, action) => {
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if(action.type === "USER_INPUT"){
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return { value: action.val, isValid: action.val.trim().length > 6 }
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}
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if(action.type === 'INPUT_BLUR'){
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return {value: state.value, isValid: state.value.trim().length > 6}
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}
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}
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const Login = () => {
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// This is for the useEffect Example
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// const [enteredEmail, setEnteredEmail] = useState('');
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// const [emailIsValid, setEmailIsValid] = useState();
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// const [enteredPassword, setEnteredPassword] = useState('');
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// const [passwordIsValid, setPasswordIsValid] = useState();
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const [formIsValid, setFormIsValid] = useState(false);
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// This is for useReducer Example
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const [emailState, dispatchEmail] = useReducer(emailReducer,{value:'', isValid: false})
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const [passwordState, dispatchPassword] = useReducer(passwordReducer,{value:'', isValid: false})
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// useEffect(() => {console.log('Effect Running')}, [])
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// console.log("Component Rendering...")
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// To reduce unneccessary useEffect
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// Desctructs the object and adds an alias to the destructured values. We use these object properties as dependencies in the useEffect hook
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const { isValid: emailIsValid } = emailState
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const { isValid: passwordIsValid } = passwordState
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const authCtx = useContext(AuthContext)
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useEffect(()=>{
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const identifier = setTimeout(() => {
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// We only care about whether the isValid state updates
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setFormIsValid(emailIsValid && passwordIsValid)
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},500)
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// Clean Up function that runs before useEffect and before component is removed. Does not run before the first side effect function execution.
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// Clears the timer from the last side effect execution and sets a new on
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return () => {clearTimeout(identifier); console.log("Cleanup")}
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},[emailIsValid, passwordIsValid])
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// this will make sure that the useEffect hook only runs whe the validity of the password or email is updated. Otherwise it would have ran after every password or email change
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// which is not ideal
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const emailChangeHandler = (event) => {
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dispatchEmail({type:"USER_INPUT", val: event.target.value});
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// setEnteredEmail(event.target.value);
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setFormIsValid(
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event.target.value.includes('@') && passwordState.isValid
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);
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};
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const passwordChangeHandler = (event) => {
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dispatchPassword({type:"USER_INPUT", val: event.target.value})
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// setEnteredPassword(event.target.value);
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setFormIsValid(
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emailState.isValid && event.target.value.trim().length > 6
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);
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};
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const validateEmailHandler = () => {
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// setEmailIsValid(emailState.isValid);
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dispatchEmail({type: 'INPUT_BLUR'})
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};
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const validatePasswordHandler = () => {
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// setPasswordIsValid(enteredPassword.trim().length > 6);
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dispatchPassword({type: 'INPUT_BLUR'})
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};
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const submitHandler = (event) => {
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event.preventDefault();
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authCtx.onLogin(emailState.value, passwordState.value)
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};
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return (
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<Card className={classes.login}>
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<form onSubmit={submitHandler}>
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<Input
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type="email"
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label="Email"
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id="email"
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isValid={emailIsValid}
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value={emailState.value}
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onChangeHandler={emailChangeHandler}
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onBlurHandler={validateEmailHandler}
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/>
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<Input
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type="password"
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label="Password"
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id="password"
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isValid={passwordIsValid}
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value={passwordState.value}
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onChangeHandler={passwordChangeHandler}
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onBlurHandler={validatePasswordHandler}
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/>
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<div className={classes.actions}>
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<Button type="submit" className={classes.btn} disabled={!formIsValid}>
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Login
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</Button>
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</div>
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</form>
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</Card>
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);
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};
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export default Login;

‎Sections/Section 10/01-starting-project/src/components/Login/Login.module.css

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.login {
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width: 90%;
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max-width: 40rem;
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margin: 2rem auto;
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padding: 2rem;
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}
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.actions {
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text-align: center;
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}

‎Sections/Section 10/01-starting-project/src/components/MainHeader/MainHeader.js

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import React from 'react';
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import Navigation from './Navigation';
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import classes from './MainHeader.module.css';
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const MainHeader = () => {
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return (
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<header className={classes['main-header']}>
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<h1>A Typical Page</h1>
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<Navigation />
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</header>
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);
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};
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export default MainHeader;

‎Sections/Section 10/01-starting-project/src/components/MainHeader/MainHeader.module.css

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.main-header {
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position: fixed;
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top: 0;
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left: 0;
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width: 100%;
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height: 5rem;
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display: flex;
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justify-content: space-between;
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align-items: center;
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background: #741188;
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padding: 0 2rem;
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}
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.main-header h1 {
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color: white;
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}

‎Sections/Section 10/01-starting-project/src/components/MainHeader/Navigation.js

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import React, { useContext } from 'react';
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import AuthContext from '../../store/auth-context';
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import classes from './Navigation.module.css';
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const Navigation = () => {
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const ctx = useContext(AuthContext);
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return(
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<nav className={classes.nav}>
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<ul>
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{ctx.isLoggedIn && (
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<li>
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<a href="/">Users</a>
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</li>
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)}
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{ctx.isLoggedIn && (
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<li>
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<a href="/">Admin</a>
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</li>
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)}
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{ctx.isLoggedIn && (
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<li>
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<button onClick={ctx.onLogout}>Logout</button>
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</li>
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)}
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</ul>
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</nav>
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);
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};
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export default Navigation;

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