sort algorithm added

Author: MsiIslam20

quick_sort.js

@@ -2,12 +2,9 @@ function quickSort(arr, left, right) {
  let len = arr.length,
  pivot,
  partitionIndex;
-
-
  if (left < right) {
  pivot = right;
  partitionIndex = partition(arr, pivot, left, right);
-
  //sort left and right
  quickSort(arr, left, partitionIndex - 1);
  quickSort(arr, partitionIndex + 1, right);
@@ -27,6 +24,7 @@ function partition(arr, pivot, left, right) {
  swap(arr, right, partitionIndex);
  return partitionIndex;
 }
+
 function swap(arr, i, j) {
  let temp = arr[i];
  arr[i] = arr[j];