Flutter - Persistent storage of a list of custom objects

persistent_storage_service.dart

import 'package:shared_preferences/shared_preferences.dart';
import 'dart:convert';

class PersistentStorageService {
  static Future<List<MyObject>> getMyObjects() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    List<String> jsonStringList = prefs.getStringList('my_objects') ?? [];
    return [
      for (var jsonString in jsonStringList)
        MyObject.fromJson(jsonDecode(jsonString))
    ];
  }

  static saveMyObjects(List<MyObject> myObjects) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    await prefs.setStringList(
        'my_objects', [for (var myo in myObjects) jsonEncode(myo.toJson())]);
  }
}

class MyObject {
  final DateTime aDate;
  final List<String> someStrings;

  MyObject({required this.aDate, required this.someStrings});

  // Convert a MyObject object into a map
  Map<String, dynamic> toJson() {
    return {
      'aDate': aDate.toIso8601String(),
      'someStrings': someStrings,
    };
  }

  // Create a MyObject object from a map
  static MyObject fromJson(Map<String, dynamic> json) {
    return MyObject(
      aDate: DateTime.parse(json['aDate']),
      someStrings: List<String>.from(json['someStrings']),
    );
  }
}

Future<void> usage() async {
  List<MyObject> myObjects = await PersistentStorageService.getMyObjects();
  myObjects.add(
      MyObject(aDate: DateTime.now(), someStrings: ['Dart', 'is', 'Fun!']));
  await PersistentStorageService.saveMyObjects(myObjects);
}

pubspec.yaml

environment:
  sdk: ">=3.1.5 <4.0.0"

dependencies:
  flutter:
    sdk: flutter
  shared_preferences: ^2.2.2