toJson method
Implementation
Map<String, dynamic> toJson() => {
"extra1": extra1,
"extra10": extra10,
"extra2": extra2,
"extra3": extra3,
"extra4": extra4,
"extra5": extra5,
"extra6": extra6,
"extra7": extra7,
"extra8": extra8,
"extra9": extra9,
};