A basic ascending and descending use case for sorting an array with Javascript's built-in sort utilizing a custom sort function

JS - custom sort basics

const arr = [4,1,2,5,3,2];

function ascendingSort(a, b) {
  if (a < b) { return -1 }
  return 1
};

function descendingSort(a, b) {
  if (a < b) { return 1 }
  return -1
};

console.log(`Native --> `, arr.sort()); // [ 1, 2, 2, 3, 4, 5 ]
console.log(`Ascending -> `, arr.sort(ascendingSort)); // [ 1, 2, 2, 3, 4, 5 ]
console.log(`Descending -> `, arr.sort(descendingSort)); // [ 5, 4, 3, 2, 2, 1 ]