function quickSort(arr) { if (arr.length <= 1) { return arr; } const pivot = arr[0]; const left = []; const right = []; for (let i = 1; i < arr.length; i++) { if (arr[i] < pivot) { left.push(arr[i]); } else { right.push(arr[i]); } } return [...quickSort(left), pivot, ...quickSort(right)]; }