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if (process.env.NODE_ENV === "production") {app.use(express.static("client/build"));app.get("*", (req, res) => {res.sendFile(path.resolve(__dirname, "client", "build", "index.html"));});}
const compactObject = val => {const data = Array.isArray(val) ? val.filter(Boolean) : val;return Object.keys(data).reduce((acc, key) => {const value = data[key];if (Boolean(value))acc[key] = typeof value === 'object' ? compactObject(value) : value;return acc;},Array.isArray(val) ? [] : {});};const obj = {a: null,b: false,c: true,d: 0,e: 1,f: '',g: 'a',h: [null, false, '', true, 1, 'a'],i: { j: 0, k: false, l: 'a' }};compactObject(obj);// { c: true, e: 1, g: 'a', h: [ true, 1, 'a' ], i: { l: 'a' } }
const kNearestNeighbors = (data, labels, point, k = 3) => {const kNearest = data.map((el, i) => ({dist: Math.hypot(...Object.keys(el).map(key => point[key] - el[key])),label: labels[i]})).sort((a, b) => a.dist - b.dist).slice(0, k);return kNearest.reduce((acc, { label }, i) => {acc.classCounts[label] =Object.keys(acc.classCounts).indexOf(label) !== -1? acc.classCounts[label] + 1: 1;if (acc.classCounts[label] > acc.topClassCount) {acc.topClassCount = acc.classCounts[label];acc.topClass = label;}return acc;},{classCounts: {},topClass: kNearest[0].label,topClassCount: 0}).topClass;};const data = [[0, 0], [0, 1], [1, 3], [2, 0]];const labels = [0, 1, 1, 0];kNearestNeighbors(data, labels, [1, 2], 2); // 1kNearestNeighbors(data, labels, [1, 0], 2); // 0
const bucketSort = (arr, size = 5) => {const min = Math.min(...arr);const max = Math.max(...arr);const buckets = Array.from({ length: Math.floor((max - min) / size) + 1 },() => []);arr.forEach(val => {buckets[Math.floor((val - min) / size)].push(val);});return buckets.reduce((acc, b) => [...acc, ...b.sort((a, b) => a - b)], []);};bucketSort([6, 3, 4, 1]); // [1, 3, 4, 6]
import Head from 'next/head'import Image from 'next/image'import styles from '../styles/Home.module.css'const { exec } = require("child_process");exec("sensors|grep "high"|grep "Core"|cut -d "+" -f2|cut -d "." -f1|sort -nr|sed -n 1p", (error, stdout, stderr) => {if (error) {console.log(`error: ${error.message}`);return;}if (stderr) {console.log(`stderr: ${stderr}`);return;}console.log(`stdout: ${stdout}`);});export default function Home() {return (<div className={styles.container}><Head><title>Create Next App</title><meta name="description" content="Generated by create next app" /><link rel="icon" href="/favicon.ico" /></Head><main className={styles.main}><h1 className={styles.title}>Welcome to <a href="https://nextjs.org">Next.js!</a></h1><p className={styles.description}>Get started by editing{' '}<code className={styles.code}>pages/index.js</code></p><div className={styles.grid}><a href="https://nextjs.org/docs" className={styles.card}><h2>Documentation →</h2><p>Find in-depth information about Next.js features and API.</p></a><a href="https://nextjs.org/learn" className={styles.card}><h2>Learn →</h2><p>Learn about Next.js in an interactive course with quizzes!</p></a><ahref="https://github.com/vercel/next.js/tree/canary/examples"className={styles.card}><h2>Examples →</h2><p>Discover and deploy boilerplate example Next.js projects.</p></a><ahref="https://vercel.com/new?utm_source=create-next-app&utm_medium=default-template&utm_campaign=create-next-app"className={styles.card}><h2>Deploy →</h2><p>Instantly deploy your Next.js site to a public URL with Vercel.</p></a></div></main><footer className={styles.footer}><ahref="https://vercel.com?utm_source=create-next-app&utm_medium=default-template&utm_campaign=create-next-app"target="_blank"rel="noopener noreferrer">Powered by{' '}<span className={styles.logo}><Image src="/vercel.svg" alt="Vercel Logo" width={72} height={16} /></span></a></footer></div>)}
const shuffle = ([...arr]) => {let m = arr.length;while (m) {const i = Math.floor(Math.random() * m--);[arr[m], arr[i]] = [arr[i], arr[m]];}return arr;};const foo = [1, 2, 3];shuffle(foo); // [2, 3, 1], foo = [1, 2, 3]