toJson method Null safety
Implementation
Map<String, dynamic> toJson() => {
"length": length,
"items": items == null
? null
: List<dynamic>.from(items!.map((x) => x.toJson())),
};
Map<String, dynamic> toJson() => {
"length": length,
"items": items == null
? null
: List<dynamic>.from(items!.map((x) => x.toJson())),
};