Record.group

group関数は、指定されたRecord内のフィールドでレコードをグルーピング（階層化）します。

サンプル

var ary=[
	{"x":"a1","y":"b1","z":"c1"},
	{"x":"a1","y":"b1","z":"c2"},
	{"x":"a1","y":"b2","z":"c3"},
	{"x":"a2","y":"b2","z":"c4"},
	{"x":"a2","y":"b3","z":"c5"},
	{"x":"a2","y":"b3","z":"c6"},
];
var obj=new Record(ary).group("x","y");
/*
obj is the next
{"a1":{"b1":[{"z":"c1"},
             {"z":"c2"}
            ],
       "b2":[{"z":"c3"}]
      },
 "a2":{"b2":[{"z":"c4"}],
       "b3":[{"z":"c5"},
             {"z":"c6"}
            ]
      }
}
*/

API

呼び出し	戻り値
`record. group ( key1, key2,... )`	`Object`

パラメータ	型	説明
`key`	`String`	フィールド名