From b74d2f26d525accd7f9ef29c65a9805ab53abb15 Mon Sep 17 00:00:00 2001
From: Izel Nakri <contact@izelnakri.com>
Date: Wed, 6 Jul 2022 01:44:17 +0200
Subject: [PATCH] Core: refactor diff to do less slow mutations

---
 src/core/utilities.js | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/src/core/utilities.js b/src/core/utilities.js
index 715311b82..74d44f501 100644
--- a/src/core/utilities.js
+++ b/src/core/utilities.js
@@ -43,18 +43,13 @@ export const performance = {
 
 // Returns a new Array with the elements that are in a but not in b
 export function diff (a, b) {
-  const result = a.slice();
-
-  for (let i = 0; i < result.length; i++) {
-    for (let j = 0; j < b.length; j++) {
-      if (result[i] === b[j]) {
-        result.splice(i, 1);
-        i--;
-        break;
-      }
+  return a.reduce((result, item) => {
+    if (b.indexOf(item) === -1) {
+      result.push(item);
     }
-  }
-  return result;
+
+    return result;
+  }, []);
 }
 
 /**