// Array.prototype.shift
const numbers = [1, 2, 3, 4, 5]
// With shift
const firstNumber = numbers.shift()
console.log(firstNumber) // 1
console.log(numbers) // [2, 3, 4, 5]

// Without shift
const [firstNumber, ...numbersWithoutOne] = [1, 2, 3, 4, 5]
// numbersWithoutOne = [2, 3, 4, 5]

console.log(firstNumber) // 1
console.log(numbersWithoutOne) // [2, 3, 4, 5]



const numbers = [3, 4, 5]
// With unshift
numbers.unshift(1, 2)
console.log(numbers) // [1, 2, 3, 4, 5]
// Without unshift

const newNumbers = [1, 2, ...numbers]
console.log(newNumbers) // [1, 2, 3, 4, 5]
//------------------------------------------------------------//
const months = ['January', 'February', 'March', 'April', ' May']
// With splice
months.splice(2, 1) // remove one element at index 2
console.log(months) // ['January', 'February', 'April', 'May']
// Without splice
const monthsFiltered = months.filter((month, i) => i !== 3)
console.log(monthsFiltered) // ['January', 'February', 'April', 'May']
// .  ***********And now you might think, yeah but If I need to remove many elements? Well,
//    use slice:

const months = ['January', 'February', 'March', 'April', ' May']
// With splice
months.slice(1, 3) // remove three elements starting at index 1
console.log(months) // ['January', 'May']
// Without splice
const monthsSliced = [...months.slice(0, 1), ...months.slice(4)]
console.log(monthsSliced) // ['January', 'May']



// Normally I would have called a function that generates ids and random names but let's not bother with that here.
function fakeUser() {
  return {
    id: 'fe38',
    name: 'thomas',
  }
}
var arr  = [7,8,9,0];
arr.fill(0);
const posts = Array(3).fill(fakeUser())
console.log(posts) // [{ id: "fe38", name: "thomas" }, { id: "fe38", name: "thomas" }, { id: "fe38", name: "thomas" }]
// reverse
// I think the method’s name is pretty clear here.

const numbers = [1, 2, 3, 4, 5]
numbers.reverse()
console.log(numbers) // [5, 4, 3, 2, 1]

Array.prototype.join(',')

//--------------------------------------------------------//\

//Array.prototype.sort
const names = ['john', 'mary', 'gary', 'anna']
names.sort()
console.log(names) // ['anna', 'gary', 'john', 'mary']

// So be careful if you come from a Python background for example, doing sort on a numbers array // just won’t give you what you expected to:

const numbers = [23, 12, 17, 187, 3, 90]
numbers.sort()
console.log(numbers) // [12, 17, 187, 23, 3, 90] 🤔