14. サンプルコード class User: Mappable { var username: String? var age: Int? var array: [AnyObject]? var group: Gruop? // 別の`Mappable`な型 required init?(_ map: Map) { mapping(map) } func mapping(map: Map) { username <- map["username"] age <- map["age"] array <- map["array"] group <- map["group"] } } class Group: Mappable { ... } 15. サンプルコード let JSON: [String: AnyObject] = [ "username": "ikesyo", "age": 2