Flutter

• Stateless widget
• Stateful widget

Stateless widget

class MyWidget extends StatelessWidget {
  const MyWidget({ Key? key }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      // ...
    );
  }
}

Stateful widget

class MyWidget extends StatefulWidget {
  const MyWidget({ Key? key }) : super(key: key);

  @override
  State<MyWidget> createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  @override
  Widget build(BuildContext context) {
    return Container(
      // ...
    );
  }
}