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

const toggle = (value) => value = !value

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

const capitalize = (str) => str.charAt(0).toUpperCase() + str.slice(1)

const isArray = (arr) => Array.isArray(arr)

const extractHostname = (url) => {  let hostname = (url.indexOf("http://") > -1) ? url.split('/')[2] : url.split('/')[0]  // Remove port number.  hostname = hostname.split(':')[0]  // Remove querystring.  hostname = hostname.split('?')[0]  return hostname}

const uniqueValues = (arr) => [...new Set(arr)]

const isOldEnough = (age) => age >= 18const ages = [7, 19, 12, 33, 15, 49]ages.every(isOldEnough) // Results in falseconst olderPeople = [39, 51, 33, 65, 49]olderPeople.every(isOldEnough) // Results in true

const formatFloat = (floatValue, decimals) => parseFloat(floatValue.toFixed(decimals)).toLocaleString("en-US")

const searchParams = new URLSearchParams(window.location.search)searchParams.set('key', 'value')history.replaceState(null, null, '?' + searchParams.toString())

const getPositiveNumber = (number) => Math.max(number, 0)

const showPrintDialog = () => window.print()

const copyTextToClipboard = async (text) => {  await navigator.clipboard.writeText(text)}

// HTML<input id="input" type="text" value="This is the text that gets copied"><button id="copy">Copy the text</button>// JavaScriptconst copy = () => {  const copyText = document.querySelector('#input')  copyText.select()  document.execCommand('copy')}
document.querySelector('#copy').addEventListener('click', copy)

const arrayToNumbers = (arr) => arr.map(Number)const numbers = arrayToNumbers(['0', '1', '2', '3'])const arrayToBooleans = (arr) => arr.map(Boolean)const booleans = arrayToBooleans(numbers)

const daysBetweenDates = (dateA, dateB) => {  const timeDifference = Math.abs(dateA.getTime() - dateB.getTime())    // Seconds * hours * miliseconds  return Math.floor(timeDifference / (3600 * 24 * 1000))}daysBetweenDates(new Date('2020/10/21'), new Date('2020/10/29'))// Result: 8daysBetweenDates(new Date('2020/10/21'), new Date('2021/10/29'))// Result: 373

const people = [    { firstName: 'Laura', lastName: 'Smith' },    { firstName: 'John', lastName: 'Wilson' },    { firstName: 'Ted', lastName: 'Jonhson' }]
people.sort((firstEl, secondEl) => {  const property = 'lastName'
  if (firstEl[property] < secondEl[property]) {    return -1  } else if (firstEl[property] > secondEl[property]) {    return 1  }  return 0})// [{firstName: 'Ted', lastName: 'Jonhson'},// {firstName: 'Laura', lastName: 'Smith'},// {firstName: 'John', lastName: 'Wilson'}]

const people = [    { firstName: 'Laura', lastName: 'Smith' },    { firstName: 'John', lastName: 'Wilson' },    { firstName: 'Ted', lastName: 'Jonhson' }]
const compareNames = (firstEl, secondEl) => {  const property = 'lastName'
  if (firstEl[property] < secondEl[property]) {    return -1  } else if (firstEl[property] > secondEl[property]) {    return 1  }  return 0}
people.sort(compareNames)// [{firstName: 'Ted', lastName: 'Jonhson'},// {firstName: 'Laura', lastName: 'Smith'},// {firstName: 'John', lastName: 'Wilson'}]

const people = [    { firstName: 'Laura', lastName: 'Smith' },    { firstName: 'John', lastName: 'Wilson' },    { firstName: 'Ted', lastName: 'Jonhson' }]
people.sort((firstEl, secondEl) => (firstEl['lastName'] < secondEl['lastName']) ? -1 : (firstEl['lastName'] > secondEl['lastName']) ? 1 : 0)// [{firstName: 'Ted', lastName: 'Jonhson'},// {firstName: 'Laura', lastName: 'Smith'},// {firstName: 'John', lastName: 'Wilson'}]

const intersection = (a, ...arr) => [...new Set(a)].filter((v) => arr.every((b) => b.includes(v)))
intersection([1, 2, 3], [2, 3, 4, 7, 8])// [2, 3]
intersection([1, 2, 3], [2, 3, 4, 7, 8], [1, 3, 9])// [3]

const daysInMonth = (month, year) => new Date(year, month, 0).getDate()
daysInMonth(2, 2024)// 29
daysInMonth(12, 2022)// 31

let personA = "Laura"let personB = "John"
let temp = personApersonA = personBpersonB = temp
console.log(personA) // "John"
console.log(personB) // "Laura"

let personA = "Laura"let personB = "John"
[personA, personB] = [personB, personA]
console.log(personA) // 'John'
console.log(personB) // 'Laura'

const flatten = (arr) => arr.reduce((a, b) => (Array.isArray(b) ? [...a, ...flatten(b)] : [...a, b]), [])
flatten([[1, 2], [3, 4], [5, 6]])// [1, 2, 3, 4, 5, 6]
flatten([["some", "text"], "and", ["some", "more"]])// ['some', 'text', 'and', 'some', 'more']

[[1, 2], [3, 4], [5, 6]].flat()// [1, 2, 3, 4, 5, 6]
[["some", "text"], "and", ["some", "more"]].flat()// ['some', 'text', 'and', 'some', 'more']

const replaceSpaces = (str) => str.replace(/\s\s+/g, ' ')
replaceSpaces('Too   many  spaces')// 'Too many spaces'

const replaceSpaces = (str) => str.replace(/\s\s+/g, ' ')
replaceSpaces('too\n   many     \twhitespaces    \rin here')// 'too many whitespaces in here'

const sortRandom = (arr) => arr.sort(() => Math.random() - 0.5)
sortRandom([1, 2, 3, 4, 5])// [4, 3, 2, 5, 1]
sortRandom(["Some text", 2, true, 4, 94.12])// ['Some text', 94.12, 2, true, 4]

const isEqual = (...objects) => objects.every(obj => JSON.stringify(obj) === JSON.stringify(objects[0]))
isEqual({ name: 'Frank', age: 32 }, { name: 'Frank', age: 32 })// true
isEqual({ name: 'Frank', age: 41 }, { name: 'Frank', age: 32 })// false
isEqual({ name: 'Frank', age: 32 }, { name: 'Frank', age: 32 }, { name: 'Frank', age: 32 })// true
isEqual({ name: 'Frank', age: 32 }, { name: 'Frank', age: 32 }, { name: 'Lisa', age: 32 })// false

const getRandomItem = arr => arr[Math.floor(Math.random() * arr.length)]
getRandomItem([1, 7, 9, 3, 6]) // 6
getRandomItem([{ name: "Ted" }, { name: "Philip" }, { name: "Jack" }]) // { name: "Philip" }
getRandomItem([{ name: "Ted" }, 1, "Some text", 4, { name: "Jack" }]) // 'Some text'

https://mywebsite.com/my-first-blog-post

const slugify = (str) => str.toLowerCase().replace(/\s+/g, '-').replace(/[^\w-]+/g, '')
slugify('The first post: What is going on?') // 'the-first-post-what-is-going-on'