js对象数组(JSON) 根据某个共同字段分组

希望的是将下面的对象数组：

[{"id":"1001","name":"值1","value":"111"},{"id":"1001","name":"值1","value":"11111"},{"id":"1002","name":"值2","value":"25462"},{"id":"1002","name":"值2","value":"23131"},{"id":"1002","name":"值2","value":"2315432"},{"id":"1003","name":"值3","value":"333333"}
]

根据相同id字段分组，转换成下面这种形式：

[{"id": "1001","name": "值1","data": [{"id": "1001", "name": "值1", "value": "111"},{ "id": "1001", "name": "值1", "value": "11111"}]},{"id": "1002","name": "值2","data": [{ "id": "1002",  "name": "值2", "value": "25462" },{ "id": "1002", "name": "值2", "value": "23131"},{"id": "1002", "name": "值2","value": "2315432" }]},{"id": "1003","name": "值3","data": [{"id": "1003", "name": "值3", "value": "333333" }]}
]

做法

var arr = [{"id":"1001","name":"值1","value":"111"},{"id":"1001","name":"值1","value":"11111"},{"id":"1002","name":"值2","value":"25462"},{"id":"1002","name":"值2","value":"23131"},{"id":"1002","name":"值2","value":"2315432"},{"id":"1003","name":"值3","value":"333333"}
];var map = {},dest = [];
for(var i = 0; i < arr.length; i++){var ai = arr[i];if(!map[ai.id]){dest.push({id: ai.id,name: ai.name,data: [ai]});map[ai.id] = ai;}else{for(var j = 0; j < dest.length; j++){var dj = dest[j];if(dj.id == ai.id){dj.data.push(ai);break;}}}
}console.log(dest);