functions-as-first-class-citizens-in-flutter.dart

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import 'package:flutter/material.dart';

void main() {
  runApp(
    const App(),
  );
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      debugShowCheckedModeBanner: false,
      home: HomePage(
        goBack: () {
          // empty for now
        },
      ),
    );
  }
}

class HomePage extends StatelessWidget {
  final VoidCallback goBack;
  const HomePage({
    Key? key,
    required this.goBack,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Home Page'),
        leading: IconButton(
          onPressed: goBack,
          icon: const Icon(
            Icons.close,
          ),
        ),
      ),
    );
  }
}