DART

return map dart

Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();

    data['id'] = this.id;
    data['userId'] = this.userId;

    return data;
 }

dart map values

void main() { 
   var details = {'Usrname':'tom','Password':'pass@123'}; 
   print(details.values); 
}