async init() {
    await new Promise((resolve, reject) => {
      AsyncStorage.getItem('app-data', (e, r) => {
        if (e) {
          reject(e);
        } else {
          this.obj = r ? JSON.parse(r) : this.obj;
          resolve(this.obj);
        }
      });
    });
  }
Synchronizes this MemoryStorage with React Native's AsyncStorage