sorting int arrays in javascript

sortingInts.js

const a = 9999
const b = 100

const arr = [9999,100]

// sort function
const res = (a, b) => {return a-b}

// "sort" 2 numbers on their own returns the result from the subtraction
console.log(res(a,b))
// returns -9899

// Same applied to arrays
console.log(res(arr[0], arr[1]))
// returns 1

// testing the same above but using the sort method
// This changes how res() acts and now it uses it as a comparison
// a-b=negative = return a
// a-b=positive = return b
const sorted = arr.sort((a,b) => {return res(a,b)})
console.log(sorted)
// returns [100,9999]