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Completed the challenge jonasschmedtmann#1 : Bank Account with useReducer in section 16 of the course
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‎challenges/bank-account-usereducer/.eslintrc.cjs‎

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module.exports = {
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root: true,
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env: { browser: true, es2020: true },
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extends: [
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'eslint:recommended',
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'plugin:react/recommended',
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'plugin:react/jsx-runtime',
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'plugin:react-hooks/recommended',
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],
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ignorePatterns: ['dist', '.eslintrc.cjs'],
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parserOptions: { ecmaVersion: 'latest', sourceType: 'module' },
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settings: { react: { version: '18.2' } },
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plugins: ['react-refresh'],
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rules: {
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'react/jsx-no-target-blank': 'off',
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'react-refresh/only-export-components': [
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'warn',
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{ allowConstantExport: true },
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],
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},
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}

‎challenges/bank-account-usereducer/.gitignore‎

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# Logs
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logs
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*.log
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*
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pnpm-debug.log*
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lerna-debug.log*
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node_modules
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dist
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dist-ssr
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*.local
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# Editor directories and files
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.vscode/*
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!.vscode/extensions.json
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.idea
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.DS_Store
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*.suo
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*.ntvs*
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*.njsproj
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*.sln
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*.sw?

‎challenges/bank-account-usereducer/README.md‎

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# React + Vite
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This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
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Currently, two official plugins are available:
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- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react/README.md) uses [Babel](https://babeljs.io/) for Fast Refresh
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- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh

‎challenges/bank-account-usereducer/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" type="image/svg+xml" href="/vite.svg" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Vite + React</title>
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</head>
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<body>
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<div id="root"></div>
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<script type="module" src="/src/main.jsx"></script>
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</body>
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</html>

‎challenges/bank-account-usereducer/package.json‎

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{
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"name": "bank-account-usereducer",
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"private": true,
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"version": "0.0.0",
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"type": "module",
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"scripts": {
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"dev": "vite",
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"build": "vite build",
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"lint": "eslint . --ext js,jsx --report-unused-disable-directives --max-warnings 0",
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"preview": "vite preview"
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},
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"dependencies": {
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"react": "^18.2.0",
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"react-dom": "^18.2.0"
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},
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"devDependencies": {
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"@types/react": "^18.2.66",
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"@types/react-dom": "^18.2.22",
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"@vitejs/plugin-react": "^4.2.1",
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"eslint": "^8.57.0",
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"eslint-plugin-react": "^7.34.1",
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"eslint-plugin-react-hooks": "^4.6.0",
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"eslint-plugin-react-refresh": "^0.4.6",
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"vite": "^5.2.0"
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}
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}

‎challenges/bank-account-usereducer/public/vite.svg‎

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‎challenges/bank-account-usereducer/src/App.css‎

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#root {
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max-width: 1280px;
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margin: 0 auto;
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padding: 2rem;
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text-align: center;
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}
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.logo {
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height: 6em;
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padding: 1.5em;
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will-change: filter;
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transition: filter 300ms;
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}
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.logo:hover {
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filter: drop-shadow(0 0 2em #646cffaa);
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}
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.logo.react:hover {
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filter: drop-shadow(0 0 2em #61dafbaa);
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}
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@keyframes logo-spin {
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from {
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transform: rotate(0deg);
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}
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to {
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transform: rotate(360deg);
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}
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}
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@media (prefers-reduced-motion: no-preference) {
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a:nth-of-type(2) .logo {
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animation: logo-spin infinite 20s linear;
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}
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}
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.card {
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padding: 2em;
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}
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.read-the-docs {
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color: #888;
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}

‎challenges/bank-account-usereducer/src/App.jsx‎

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import { useReducer } from "react";
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import "./App.css";
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const initialState = {
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balance: 0,
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loan: 0,
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isActive: false,
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};
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const reducer = (state, action) => {
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if (!state.isActive && action.type !== "openAccount") return state;
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switch (action.type) {
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case "openAccount":
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return { ...state, isActive: true, balance: 500 };
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case "deposit":
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return { ...state, balance: state.balance + action.payload };
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case "withdraw":
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return { ...state, balance: state.balance - action.payload };
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case "requestLoan": {
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const haveLoan = state.loan === action.payload;
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return {
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...state,
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loan: haveLoan ? state.loan : action.payload,
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balance: haveLoan ? state.balance : state.balance + action.payload,
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};
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}
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case "payLoan": {
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const haveLoan = state.loan === action.payload;
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return {
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...state,
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loan: haveLoan ? state.loan - action.payload : state.loan,
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balance: haveLoan ? state.balance - action.payload : state.balance,
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};
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}
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case "closeAccount":
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if (state.balance === 0 && state.loan === 0) return { ...initialState };
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return { ...state };
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default:
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throw new Error("Unknown type error");
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}
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};
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export default function App() {
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const [{ balance, loan, isActive }, dispatch] = useReducer(
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reducer,
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initialState
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);
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return (
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<div className="App">
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<h1>useReducer Bank Account</h1>
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<p>Balance: {balance}</p>
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<p>Loan: {loan}</p>
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<p>
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<button
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onClick={() => dispatch({ type: "openAccount" })}
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disabled={isActive}
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>
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Open account
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</button>
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</p>
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<p>
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<button
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onClick={() => dispatch({ type: "deposit", payload: 150 })}
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disabled={!isActive}
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>
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Deposit 150
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</button>
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</p>
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<p>
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<button
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onClick={() => dispatch({ type: "withdraw", payload: 50 })}
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disabled={!isActive}
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>
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Withdraw 50
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</button>
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</p>
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<p>
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<button
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onClick={() => dispatch({ type: "requestLoan", payload: 5000 })}
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disabled={!isActive}
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>
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Request a loan of 5000
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</button>
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</p>
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<p>
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<button
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onClick={() => dispatch({ type: "payLoan", payload: 5000 })}
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disabled={!isActive}
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>
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Pay loan
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</button>
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</p>
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<p>
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<button
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onClick={() => dispatch({ type: "closeAccount" })}
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disabled={!isActive}
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>
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Close account
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</button>
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</p>
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</div>
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);
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}

‎challenges/bank-account-usereducer/src/assets/react.svg‎

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‎challenges/bank-account-usereducer/src/index.css‎

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:root {
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font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
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line-height: 1.5;
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font-weight: 400;
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color-scheme: light dark;
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color: rgba(255, 255, 255, 0.87);
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background-color: #242424;
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font-synthesis: none;
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text-rendering: optimizeLegibility;
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-webkit-font-smoothing: antialiased;
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-moz-osx-font-smoothing: grayscale;
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}
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a {
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font-weight: 500;
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color: #646cff;
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text-decoration: inherit;
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}
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a:hover {
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color: #535bf2;
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}
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body {
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margin: 0;
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display: flex;
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place-items: center;
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min-width: 320px;
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min-height: 100vh;
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}
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h1 {
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font-size: 3.2em;
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line-height: 1.1;
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}
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button {
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border-radius: 8px;
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border: 1px solid transparent;
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padding: 0.6em 1.2em;
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font-size: 1em;
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font-weight: 500;
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font-family: inherit;
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background-color: #1a1a1a;
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cursor: pointer;
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transition: border-color 0.25s;
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}
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button:hover {
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border-color: #646cff;
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}
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button:focus,
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button:focus-visible {
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outline: 4px auto -webkit-focus-ring-color;
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}
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@media (prefers-color-scheme: light) {
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:root {
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color: #213547;
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background-color: #ffffff;
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}
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a:hover {
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color: #747bff;
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}
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button {
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background-color: #f9f9f9;
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}
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}

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