appending-to-iterablet-in-dart.dart

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import 'package:flutter/material.dart';
import 'dart:developer' as devtools show log;

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

extension Log on Object {
  void log() => devtools.log(toString());
}

const Iterable<int> values = [10, 20, 30];

extension InlineAdd<T> on Iterable<T> {
  Iterable<T> operator +(T other) => followedBy([other]);
  Iterable<T> operator &(Iterable<T> other) => followedBy(other);
}

void testIt() {
  (values + 40).log(); // (10, 20, 30, 40)
  (values & [40, 50]).log(); // (10, 20, 30, 40, 50)
}

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: const HomePage(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    testIt();
    return Scaffold(
      appBar: AppBar(
        title: const Text('Home Page'),
      ),
    );
  }
}