What are the characteristic features that can be highlighted when creating a user interface in Flutter?

When creating a user interface in Flutter, the following characteristic features can be highlighted:

• Declarative style: The UI is described as a widget tree, where each widget is responsible for a part of the interface.
• Widget composition: The interface is built from many nested widgets, which facilitates reuse and maintenance.
• Hot reload: Allows you to quickly see changes in the UI without restarting the application.
• Reactivity: The state manages the display, and when the state changes, the UI automatically updates.
• Single codebase for different platforms: Flutter enables creating applications for iOS, Android, and other platforms with one code.

Example of a simple widget:

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: Text('Hello, Flutter!'),
    );
  }
}