spreading-customc-classes-in-dart.dart

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import 'dart:collection' show MapView;

import 'dart:developer' as devtools show log;

extension Log on Object {
  void log() => devtools.log(toString());
}

@immutable
class Person extends MapView<String, String> {
  final String firstName;
  final String lastName;
  Person(this.firstName, this.lastName)
      : super(
          {
            'first_name': firstName,
            'last_name': lastName,
          },
        );
}

void testIt() {
  final Map<String, dynamic> json = {
    'address': '123 Main St',
    ...Person('John', 'Doe'),
  };
  // logs the following:
  // {
  //   address: 123 Main St,
  //   first_name: John,
  //   last_name: Doe
  // }
  json.log();
}