sort.js

let numbers = [100, 0, 99, -1, 999, 4]
let sorted = numbers.sort((a, b) => a - b); // by default sort sorts in ascending order

// when a - b > 0, this means a > b, so a should be after b
// which means that larger number a should be after smaller number b
console.log(sorted)

let sortedDesc = numbers.sort((a, b) => b - a); // sort in descending order
// when b - a > 0, this means b > a, so b should be after a
// which means that larger number b should be after smaller number a
// which will by default mean descending order
console.log(sortedDesc)