1 files changed, 15 insertions, 0 deletions
diff --git a/install/ui/ipa.js b/install/ui/ipa.js
index 34174c81..be874810 100644
--- a/install/ui/ipa.js
+++ b/install/ui/ipa.js
@@ -1548,6 +1548,21 @@ IPA.is_empty = function(value) {
     return empty;
 };
 
+IPA.array_diff = function(a, b) {
+
+    if (a === b || (!a && !b)) return false;
+
+    if (!a || !b) return true;
+
+    if (a.length !== b.length) return true;
+
+    for (var i=0; i<a.length; i++) {
+        if (a[i] !== b[i]) return true;
+    }
+
+    return false;
+};
+
 IPA.config = {
     default_priority: 500
 };