Flutter/dart/singleton

class SingletonHoge {
  String name = "";
  SingletonHoge._privateConstructor();
  static final SingletonHoge _instance = SingletonHoge._privateConstructor();
  static SingletonHoge get instance {
    return _instance;
  }
}

SingletonHoge hoge = SingletonHoge.instance;
print (hoge.name); // ""
hoge.name = "taro";
print (hoge.name); // "taro"

https://stackoverflow.com/questions/12649573/how-do-you-build-a-singleton-in-dart