So sánh đối tượng trong Dart với thư viện Equatable

class Person {
  String name;
  int weight;
  int height;

  Person({
    required this.name,
    required this.weight,
    required this.height,
  });

  @override
  bool operator ==(Object other) {
    if (other is! Person) {
      return false;
    }
    return weight == other.weight && height == other.height;
  }

  @override
  int get hashCode {
    return weight * 31 + height;
  }
}

dependencies: 
  # https://pub.dev/packages/equatable
  equatable: ^2.0.5

import 'package:equatable/equatable.dart';

class Employee extends Equatable {
  int id;
  String fullName;
  double salary;

  Employee(this.id, this.fullName, this.salary);

  @override
  List<Object?> get props => [id, fullName, salary];
}

import 'employee.dart';

void main() {
  Employee tom = Employee(1, "Tom", 1000);
  Employee tom2 = Employee(1, "Tom", 1000);
  Employee jerry = Employee(2, "Jerry", 1000);

  print("tom == tom2? ${tom == tom2}"); // true
  print("tom == jerry? ${tom == jerry}"); // false
}