import 'package:flutter/foundation.dart';

class Person {
  String name;
  int age;

  Person(this.name, this.age);
}

class MyProvider with ChangeNotifier {
  final List<Person> _people = [
    Person('John', 30),
    Person('Jane', 25),
    Person('Jack', 20),
    Person('Chea', 40),
  ];

  List<Person> get people => _people;

  void addPerson(Person person) {
    _people.add(person);
    notifyListeners();
  }

  void removePerson(Person person) {
    _people.remove(person);
    notifyListeners();
  }

  void removeLastPerson() {
    _people.removeLast();
    notifyListeners();
  }
}