Flutter/dart/singleton

class SingletonHoge {
  String name = "";
  static final SingletonHoge _singleton = SingletonHoge._internal();
  factory SingletonHoge() {
    return _singleton;
  }
  SingletonHoge._internal() {
    // init
  }
}

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

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