getItems method
Implementation
String getItems() {
  List<String> result = [];
  if(this.items != null) {
    for(Item item in this.items!) {
      result.add(item.toString());
    }
  }
  return "[${result.join(",")}]";
}
String getItems() {
  List<String> result = [];
  if(this.items != null) {
    for(Item item in this.items!) {
      result.add(item.toString());
    }
  }
  return "[${result.join(",")}]";
}