Exercises

// 1) Stateless: build a Profile card from a Map
class ProfileCard extends StatelessWidget {
  final Map<String, String> user;
  const ProfileCard({super.key, required this.user});

  @override
  Widget build(BuildContext context) {
    return Card(
      child: ListTile(
        title: Text(user['name'] ?? ''),
        subtitle: Text(user['email'] ?? ''),
      ),
    );
  }
}

// 2) Stateful: a counter that disables at 10
class CappedCounter extends StatefulWidget {
  const CappedCounter({super.key});
  @override
  State<CappedCounter> createState() => _CappedCounterState();
}

class _CappedCounterState extends State<CappedCounter> {
  int n = 0;
  @override
  Widget build(BuildContext context) {
    final atCap = n >= 10;
    return Column(children: [
      Text('Count: $n'),
      ElevatedButton(
        onPressed: atCap ? null : () => setState(() => n++),
        child: Text(atCap ? 'Maxed' : 'Add'),
      ),
    ]);
  }
}

// 3) FutureBuilder: render a list from a fake API
class Names extends StatelessWidget {
  const Names({super.key});
  Future<List<String>> _load() async {
    await Future.delayed(const Duration(milliseconds: 300));
    return ['Ada', 'Linus', 'Grace'];
  }

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<List<String>>(
      future: _load(),
      builder: (ctx, snap) {
        if (!snap.hasData) return const CircularProgressIndicator();
        return ListView(children: snap.data!.map(Text.new).toList());
      },
    );
  }
}

// Fill in: class Greet extends ____Widget { … }