hascode-added-main.dart

class UserModel {
  UserModel({this.firstName, this.lastName, this.profileImageUrl});
  String firstName;
  String lastName;
  String profileImageUrl;

  //New
  @override
  bool operator ==(Object other) =>
      identical(this, other) ||
      other is UserModel &&
          runtimeType == other.runtimeType &&
          firstName == other.firstName &&
          lastName == other.lastName &&
          profileImageUrl == other.profileImageUrl;

  //New
  @override
  int get hashCode =>
      firstName.hashCode ^ lastName.hashCode ^ profileImageUrl.hashCode;
}