refactor: rcmd hot

lib/utils/extension.dart

@@ -13,3 +13,31 @@ extension ScrollControllerExt on ScrollController {
         duration: const Duration(milliseconds: 500), curve: Curves.easeInOut);
   }
 }
+
+extension ListExt<T> on List<T>? {
+  bool get isNullOrEmpty => this == null || this!.isEmpty;
+
+  T? getOrNull(int index) {
+    if (isNullOrEmpty) {
+      return null;
+    }
+    return this![index];
+  }
+
+  bool eq(List<T>? other) {
+    if (this == null) {
+      return other == null;
+    }
+    if (other == null || this!.length != other.length) {
+      return false;
+    }
+    for (int index = 0; index < this!.length; index += 1) {
+      if (this![index] != other[index]) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  bool ne(List<T>? other) => !eq(other);
+}