This commit is contained in:
Nathan Anderson 2024-05-02 15:40:22 -06:00
parent 73bf1500f9
commit e8ae9d8cda

View File

@ -20,6 +20,49 @@ class MyApp extends StatelessWidget {
} }
} }
abstract class ListStrategy<T> {
List<T> compose(List<T> items);
}
class Monkey {
Monkey({required this.name, required this.power});
final String name;
final int power;
@override
String toString() => '$name - Power: $power';
}
class GreatestMonkeyStrategy implements ListStrategy<Monkey> {
@override
List<Monkey> compose(List<Monkey> items) {
return [
items.fold<Monkey>(
Monkey(name: '', power: 0), (aMonkey, bMonkey) => aMonkey.power > bMonkey.power ? aMonkey : bMonkey)
];
}
}
class WeakMonkeysStrategy implements ListStrategy<Monkey> {
@override
List<Monkey> compose(List<Monkey> items) {
return items
.where(
(element) => element.power <= 200,
)
.toList();
}
}
List<Monkey> monkeys = [
Monkey(name: 'Mortimer', power: 25),
Monkey(name: 'ApeMan', power: 354),
Monkey(name: 'Spider', power: 65),
Monkey(name: 'DK', power: 500),
Monkey(name: 'Tim', power: 120),
Monkey(name: 'Kong', power: 25400),
];
class MyHomePage extends StatefulWidget { class MyHomePage extends StatefulWidget {
const MyHomePage({super.key}); const MyHomePage({super.key});
@ -28,6 +71,16 @@ class MyHomePage extends StatefulWidget {
} }
class _MyHomePageState extends State<MyHomePage> { class _MyHomePageState extends State<MyHomePage> {
ListStrategy listStrat = WeakMonkeysStrategy();
void swapStrategies() {
if (listStrat.runtimeType == WeakMonkeysStrategy) {
setState(() => listStrat = GreatestMonkeyStrategy());
return;
}
setState(() => listStrat = WeakMonkeysStrategy());
}
@override @override
Widget build(BuildContext context) { Widget build(BuildContext context) {
return Scaffold( return Scaffold(
@ -39,13 +92,22 @@ class _MyHomePageState extends State<MyHomePage> {
child: Column( child: Column(
mainAxisAlignment: MainAxisAlignment.center, mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[ children: <Widget>[
const Text( const Text('All monkeys:'),
'You have pushed the button this many times:', ...monkeys
), .map(
Text( (e) => Text(e.toString()),
'some text', )
style: Theme.of(context).textTheme.headlineMedium, .toList(),
), const SizedBox(height: 50),
Text(listStrat.runtimeType.toString()),
...listStrat
.compose(monkeys)
.map(
(e) => Text(e.toString()),
)
.toList(),
const SizedBox(height: 100),
ElevatedButton(onPressed: () => swapStrategies(), child: const Text('Change Strats')),
], ],
), ),
), ),