Flutter-multi-level-dropdown-02.dart

class Repository {

  List<Map> getAll() => _nigeria;

  getLocalByState(String state) => null
     

  List<String> getStates() => null

  List _nigeria = [
    {
      "state": "Adamawa",
      "alias": "adamawa",
      "lgas": [
        "Demsa",
        "Ganye",
        "Gayuk",
      ]
    },
    {
      "state": "Akwa Ibom",
      "alias": "akwa_ibom",
      "lgas": [
        "Abak",
        "Eastern Obolo",
        "Eket",
     
  ];
}