constructor-vs-factory-constructor-in-dart.dart

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import 'package:flutter/foundation.dart';

@immutable
class Person {
  final String firstName;
  final String lastName;

  const Person({
    required this.firstName,
    required this.lastName,
  });

  const Person.fooBar()
      : firstName = 'Foo',
        lastName = 'Bar';

  factory Person.bazQux() => const Person(
        firstName: 'Baz',
        lastName: 'Qux',
      );

  factory Person.unknown() {
    // do some work here if you need to
    return const Person(
      firstName: 'Unknown',
      lastName: 'Unknown',
    );
  }
}