30 Killer JavaScript One-Liners That’ll Make You Look Like a Pro 😎

   const copyToClipboard = text => { const el = document.createElement("textarea"); el.value = text; document.body.appendChild(el); el.select(); document.execCommand("copy"); document.body.removeChild(el); };

   const shuffleArray = arr => arr.sort(() => Math.random() - 0.5);

   const generatePassword = length => Array.from({ length }, () => String.fromCharCode(Math.floor(Math.random() * 94) + 33)).join('');

   const getSelectedText = () => window.getSelection().toString();

   const isPalindrome = str => str === str.split('').reverse().join('');

   const isPrime = num => { for(let i = 2; i < num; i++) if(num % i === 0) return false; return num > 1; };
   const sumPrimes = n => Array.from({ length: n }, (_, i) => isPrime(i) ? i : 0).reduce((a, b) => a + b);

   const countdown = (seconds, callback) => { const interval = setInterval(() => { if (seconds === 0) { clearInterval(interval); callback(); } seconds--; }, 1000); };

   const basicCalculator = (a, operator, b) => operator === '+' ? a + b : operator === '-' ? a - b : operator === '*' ? a * b : operator === '/' ? a / b : 'Invalid operator';

   const isEmailValid = email => /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email);

const isEven = num => num % 2 === 0;

const generateUUID = () => 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, c => (Math.random() * 16 | 0).toString(16));

const getFileExtension = url => url.split('.').pop();

const calculateDistance = (lat1, lon1, lat2, lon2) => { const rad = x => x * Math.PI / 180; const R = 6371; const dLat = rad(lat2 - lat1); const dLon = rad(lon2 - lon1); return R * 2 * Math.asin(Math.sqrt(Math.sin(dLat/2) * Math.sin(dLat/2) + Math.cos(rad(lat1)) * Math.cos(rad(lat2)) * Math.sin(dLon/2) * Math.sin(dLon/2))); };

const encodedURL = encodeURIComponent("your_url");
const decodedURL = decodeURIComponent(encodedURL);

const intersection = (arr1, arr2) => arr1.filter(value => arr2.includes(value));

const sortByProperty = (arr, prop) => arr.sort((a, b) => a[prop] > b[prop] ? 1 : -1);

const removeDuplicates = arr => Array.from(new Set(arr));

const todoList = JSON.parse(localStorage.getItem('todos')) || [];
    // Adding a new task to the Todo-list
    todoList.push(newTask);
    // Save the updated list in local storage
    localStorage.setItem('todos', JSON.stringify(todoList));

const rgbaToHex = (r, g, b, a) => `#${(1 << 24 | r << 16 | g << 8 | b).toString(16).slice(1)}`;

const findLongestWord = sentence => sentence.split(' ').reduce((longest, word) => word.length > longest.length ? word : longest);

const calculateAge = birthdate => Math.floor((new Date() - new Date(birthdate)) / 31557600000);

const isPrime = num => { for(let i = 2; i < num; i++) if(num % i === 0) return false; return num > 1; };

const formatDate = timestamp => new Date(timestamp).toLocaleDateString();

const calculateAverage = numbers => numbers.reduce((total, num) => total + num, 0) / numbers.length;

const quotes = ["Quote 1", "Quote 2", "Quote 3"];
const randomQuote = quotes[Math.floor(Math.random() * quotes.length)];

const updateClock = () => { const now = new Date(); const time = now.toLocaleTimeString(); document.getElementById("clock").textContent = time; };
    setInterval(updateClock, 1000);

    // Create
    localStorage.setItem('key', 'value');
    // Read
    const value = localStorage.getItem('key');
    // Update
    localStorage.setItem('key', 'new_value');
    // Delete
    localStorage.removeItem('key');

    const hexToRGBA = hex => { const bigint = parseInt(hex, 16); const r = (bigint >> 16) & 255; const g = (bigint >> 8) & 255; const b = bigint & 

255; return `rgba(${r}, ${g}, ${b}, 1)`; };

const generateQRCode = text => { const qr = new QRCode(document.getElementById("qrcode"), { text: text, width: 128, height: 128 }); };

    alert("Hello, World!");