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lib/utils/list_utils.dart

@@ -11,4 +11,17 @@ List<int> listToIntList(List<dynamic> srcList){
   });
 
   return list;
+}
+
+/// Find the list of missing elements of a [testList] from a [srcList]
+List<T> findMissingFromList<T>(List<T> srcList, List<T>testList) {
+
+  List<T> dest = List();
+
+  testList.forEach((f){
+    if(!srcList.contains(f) && !dest.contains(f))
+      dest.add(f);
+  });
+
+  return dest;
 }