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const randomNumberInRange = (min = 0, max = 100) => Math.floor(Math.random() * (max - min + 1)) + min;

randomNumberInRange()
// Result: Default random number range is 0 - 100, so you get a number between 0 and 100.
randomNumberInRange(100, 200)
// Result: You will get a random number between 100 and 200, where 100 is min range and 200 is max range.

sayyedhammadali

const isDateValid = (...val) => !Number.isNaN(new Date(...val).valueOf());

isDateValid("December 17, 1995 03:24:00");
// Result: true

sayyedhammadali

const cookie = name => `; ${document.cookie}`.split(`; ${name}=`).pop().split(';').shift();

cookie('_ga');
// Result: "GA1.2.1929736587.1601974046"

sayyedhammadali

const removeDuplicates = (arr) => [...new Set(arr)];

removeDuplicates([31, 56, 12, 31, 45, 12, 31]);
//[ 31, 56, 12, 45 ]

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const randomBoolean = () => Math.random() >= 0.5;

console.log(randomBoolean());
// Result: a 50/50 change on returning true of false

sayyedhammadali

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

sayyedhammadali

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

dayOfYear(new Date());
// Result: 272

sayyedhammadali

const touchSupported = () => {
  ('ontouchstart' in window || window.DocumentTouch && document instanceof window.DocumentTouch);
}

console.log(touchSupported());
// Result: will return true if touch events are supported, false if not

sayyedhammadali

const average = arr => arr.reduce((a, b) => a + b) / arr.length;

average([21, 56, 23, 122, 67])
//57.8

sayyedhammadali

const getParameters = (URL) => JSON.parse('{"' + decodeURI(URL.split("?")[1]).replace(/"/g, '\\"').replace(/&/g, '","').replace(/=/g, '":"') +'"}');

getParameters("https://www.google.de/search?q=cars&start=40");
// Result: { q: 'cars', start: '40' }