From 9b4f3c71c092452ca77f8b4ad860eee59a578699 Mon Sep 17 00:00:00 2001
From: Javier Segarra <jsegarra@verdnatura.es>
Date: Mon, 7 Apr 2025 14:19:39 +0200
Subject: [PATCH] perf: refs #8217 getDifferences

---
 src/filters/getDifferences.js | 57 +++++++++++++++++++++++++++--------
 1 file changed, 44 insertions(+), 13 deletions(-)

diff --git a/src/filters/getDifferences.js b/src/filters/getDifferences.js
index 33244d1cb..5b123d727 100644
--- a/src/filters/getDifferences.js
+++ b/src/filters/getDifferences.js
@@ -1,23 +1,54 @@
 export default function getDifferences(obj1, obj2) {
-    let diff = {};
+    const diff = {};
 
-    delete obj1.$index;
-    if (!obj2) return obj1;
-    delete obj2.$index;
+    const copyObj1 = { ...obj1 };
+    const copyObj2 = obj2 ? { ...obj2 } : {};
 
-    for (let key in obj1) {
-        if (obj2[key] && JSON.stringify(obj1[key]) !== JSON.stringify(obj2[key])) {
-            diff[key] = obj2[key];
+    delete copyObj1.$index;
+    if (copyObj2) delete copyObj2.$index;
+
+    for (const key in copyObj1) {
+        if (copyObj1.hasOwnProperty(key)) {
+            if (
+                !copyObj2.hasOwnProperty(key) ||
+                !deepCompare(copyObj1[key], copyObj2[key])
+            ) {
+                diff[key] = copyObj1[key];
+            }
         }
     }
-    for (let key in obj2) {
-        if (
-            obj1[key] === undefined ||
-            JSON.stringify(obj1[key]) !== JSON.stringify(obj2[key])
-        ) {
-            diff[key] = obj2[key];
+
+    for (const key in copyObj2) {
+        if (copyObj2.hasOwnProperty(key) && !copyObj1.hasOwnProperty(key)) {
+            diff[key] = copyObj2[key];
         }
     }
 
     return diff;
 }
+
+function deepCompare(obj1, obj2) {
+    if (
+        typeof obj1 !== 'object' ||
+        obj1 === null ||
+        typeof obj2 !== 'object' ||
+        obj2 === null
+    ) {
+        return obj1 === obj2;
+    }
+
+    const keys1 = Object.keys(obj1);
+    const keys2 = Object.keys(obj2);
+
+    if (keys1.length !== keys2.length) {
+        return false;
+    }
+
+    for (const key of keys1) {
+        if (!obj2.hasOwnProperty(key) || !deepCompare(obj1[key], obj2[key])) {
+            return false;
+        }
+    }
+
+    return true;
+}