dynamic getters for class based on Map and noSuchMethod

main.dart

class QueryMap<T> {
 
  Map<String,T> _data;

  QueryMap(Map<String,T> data) {
    _data = Map<String,T>();
    data.forEach((k, v) => _data[new Symbol(k).toString()] = v);
  }

  dynamic noSuchMethod(Invocation invocation) {
    if (invocation.isGetter) {
      var ret = _data[invocation.memberName.toString()];
      if (ret != null) {
        return ret;
      } else {
        super.noSuchMethod(invocation);
      }
    }
    if (invocation.isSetter) {
      _data[invocation.memberName.toString().replaceAll('=', '')] =
          invocation.positionalArguments.first;
    } else {
      super.noSuchMethod(invocation);
    }
  }
}
void main() {
  dynamic qaueryMap = new QueryMap({"ecg":10.0});
  print(qaueryMap.ecg);
}