BadFL Example Code (extension/iterable)

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      // switch to try example1 & example2
      home: Example1(),
      // home: Example2(),
    );
  }
}

class Example1 extends StatelessWidget {
  const Example1({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        // mark as `List<Widget>` to use `slotted` with default builder (asIs)
        children: const <Widget>[
          Text('item1'),
          Text('item2'),
          Text('item3'),
          Text('item4'),
        ].slotted(slot: const Divider()),
      ),
    );
  }
}

class Example2 extends StatelessWidget {
  const Example2({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        // custom builder for widget creation
        children: const [1, 2, 3, 4].slotted(
          builder: (int num) => Text('item$num'),
          slot: const Divider(),
        ),
      ),
    );
  }
}

// Since Dartpad does not support importing packages,
// I need to copy the necessary code here.
// You can directly use `import "package:bad_fl/bad_fl.dart"` to import it when using it

extension IterableExt<Item> on Iterable<Item> {
  List<Product> slotted<Product>({
    required Product Function(Item item) builder,
    required Product slot,
  }) {
    final result = <Product>[];
    bool skip = true;
    for (Item item in this) {
      if (skip) {
        skip = false;
      } else {
        result.add(slot);
      }
      result.add(builder(item));
    }
    return result;
  }
}

Widget asIs(Widget it) => it;

extension IterableWidgetExt on Iterable<Widget> {
  List<Widget> slotted({
    Widget Function(Widget item) builder = asIs,
    required Widget slot,
  }) {
    final result = <Widget>[];
    bool skip = true;
    for (Widget item in this) {
      if (skip) {
        skip = false;
      } else {
        result.add(slot);
      }
      result.add(builder(item));
    }
    return result;
  }
}