const shuffleArray = (arr) => arr.sort(() => 0.5 - Math.random());console.log(shuffleArray([1, 2, 3, 4]));// Result: [ 1, 4, 3, 2 ]

const isDateValid = (...val) => !Number.isNaN(new Date(...val).valueOf());isDateValid("December 17, 1995 03:24:00");// Result: true

const copyToClipboard = (text) => navigator.clipboard.writeText(text);copyToClipboard("Hello World");

const dayOfYear = (date) =>  Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);dayOfYear(new Date());// Result: 272

const capitalize = str => str.charAt(0).toUpperCase() + str.slice(1)capitalize("follow for more")// Result: Follow for more

const dayDif = (date1, date2) => Math.ceil(Math.abs(date1.getTime() - date2.getTime()) / 86400000)dayDif(new Date("2020-10-21"), new Date("2021-10-22"))// Result: 366

const clearCookies = document.cookie.split(';').forEach(cookie => document.cookie = cookie.replace(/^ +/, '').replace(/=.*/, `=;expires=${new Date(0).toUTCString()};path=/`));

const randomHex = () => `#${Math.floor(Math.random() * 0xffffff).toString(16).padEnd(6, "0")}`;console.log(randomHex());// Result: #92b008

const removeDuplicates = (arr) => [...new Set(arr)];console.log(removeDuplicates([1, 2, 3, 3, 4, 4, 5, 5, 6]));// Result: [ 1, 2, 3, 4, 5, 6 ]

const getParameters = (URL) => {  URL = JSON.parse('{"' + decodeURI(URL.split("?")[1]).replace(/"/g, '\\"').replace(/&/g, '","').replace(/=/g, '":"') +'"}');  return JSON.stringify(URL);};getParameters(window.location)// Result: { search : "easy", page : 3 }

const timeFromDate = date => date.toTimeString().slice(0, 8);console.log(timeFromDate(new Date(2021, 0, 10, 17, 30, 0))); // Result: "17:30:00"

const isEven = num => num % 2 === 0;console.log(isEven(2)); // Result: True

const average = (...args) => args.reduce((a, b) => a + b) / args.length;average(1, 2, 3, 4);// Result: 2.5

const isNotEmpty = arr => Array.isArray(arr) && arr.length > 0;isNotEmpty([1, 2, 3]);// Result: true

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

const isDarkMode = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matchesconsole.log(isDarkMode) // Result: True or False