Quicksort in JS

quicksort.js

const quicksort = (arr) => {
  if (arr.length <= 1) {
    return arr;
  }

  const pivot = arr[0];
  const others = arr.slice(1);

  return [
    ...quicksort(others.filter(v => v <= pivot)),
    pivot,
    ...quicksort(others.filter(v => v > pivot)),
  ];
};

const input = [8, 6, 7, 5, 3, 0, 9];

const result = quicksort(input);