Example of a service to help abstract the storage of experimental mode on local device

experimental_mode.dart

import 'package:firebase_analytics/firebase_analytics.dart';
import 'package:japanese_reading/services/preferences.dart';

class ExperimentalMode {
  static final cacheStaleKey = 'cache_stale';
  static final experimentalModeKey = 'experimental_mode';

  final FirebaseAnalytics analytics;
  final Preferences preferences;

  ExperimentalMode(this.preferences, this.analytics);

  get isExperimentalMode => preferences.getBool(experimentalModeKey) ?? false;

  void setConfigStale(bool isStale) {
    preferences.set(cacheStaleKey, isStale);
  }

  bool isConfigStale() => preferences.getBool(cacheStaleKey) ?? false;

  void setExperimentalMode(bool experimentalMode) {
    final value = experimentalMode ? "true" : "false";
    preferences.set(experimentalModeKey, experimentalMode);
    this.analytics.setUserProperty(name: 'experimental_mode', value: value);
    this.analytics.logEvent(name: 'toggled_experimental_mode', parameters: { 'value': value });
  }
}