DateSymbols.deserializeFromMap constructor Null safety

Implementation

factory DateSymbols.deserializeFromMap(Map<dynamic, dynamic> map) {
  List<String> _getStringList(String name) => List<String>.from(map[name]);
  return DateSymbols(
    NAME: map['NAME'],
    ERAS: _getStringList('ERAS'),
    ERANAMES: _getStringList('ERANAMES'),
    NARROWMONTHS: _getStringList('NARROWMONTHS'),
    STANDALONENARROWMONTHS: _getStringList('STANDALONENARROWMONTHS'),
    MONTHS: _getStringList('MONTHS'),
    STANDALONEMONTHS: _getStringList('STANDALONEMONTHS'),
    SHORTMONTHS: _getStringList('SHORTMONTHS'),
    STANDALONESHORTMONTHS: _getStringList('STANDALONESHORTMONTHS'),
    WEEKDAYS: _getStringList('WEEKDAYS'),
    STANDALONEWEEKDAYS: _getStringList('STANDALONEWEEKDAYS'),
    SHORTWEEKDAYS: _getStringList('SHORTWEEKDAYS'),
    STANDALONESHORTWEEKDAYS: _getStringList('STANDALONESHORTWEEKDAYS'),
    NARROWWEEKDAYS: _getStringList('NARROWWEEKDAYS'),
    STANDALONENARROWWEEKDAYS: _getStringList('STANDALONENARROWWEEKDAYS'),
    SHORTQUARTERS: _getStringList('SHORTQUARTERS'),
    QUARTERS: _getStringList('QUARTERS'),
    AMPMS: _getStringList('AMPMS'),
    ZERODIGIT: map['ZERODIGIT'],
    DATEFORMATS: _getStringList('DATEFORMATS'),
    TIMEFORMATS: _getStringList('TIMEFORMATS'),
    AVAILABLEFORMATS: Map<String, String>.from(map['AVAILABLEFORMATS'] ?? {}),
    FIRSTDAYOFWEEK: map['FIRSTDAYOFWEEK'],
    WEEKENDRANGE: List<int>.from(map['WEEKENDRANGE']),
    FIRSTWEEKCUTOFFDAY: map['FIRSTWEEKCUTOFFDAY'],
    DATETIMEFORMATS: _getStringList('DATETIMEFORMATS'),
  );
}