From 4d1c6ea551016c955f3377f19444eea2ad623bc4 Mon Sep 17 00:00:00 2001
From: Guy Ariely <guyariely@gmail.com>
Date: Wed, 5 May 2021 12:24:42 +0300
Subject: [PATCH] fixed the merge implementation in MergeSort

---
 Sorts/MergeSort.js | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/Sorts/MergeSort.js b/Sorts/MergeSort.js
index b634704cf..102f33e7e 100644
--- a/Sorts/MergeSort.js
+++ b/Sorts/MergeSort.js
@@ -35,16 +35,19 @@
 */
 
 function merge (list1, list2) {
-  var results = []
+  const results = []
+  let i = 0
+  let j = 0
 
-  while (list1.length && list2.length) {
-    if (list1[0] <= list2[0]) {
-      results.push(list1.shift())
+  while (i < list1.length && j < list2.length) {
+    if (list1[i] < list2[j]) {
+      results.push(list1[i++])
     } else {
-      results.push(list2.shift())
+      results.push(list2[j++])
     }
   }
-  return results.concat(list1, list2)
+
+  return results.concat(list1.slice(i), list2.slice(j))
 }
 
 /**