数组对象去重整合

let 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"}
];

let map = {},
let 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++){
let dj = dest[j];
if(dj.id == ai.id){
dj.data.push(ai);
break;
}
}
}
}

console.log(dest);
[{
"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" }
]
}
]

原文地址：https://www.cnblogs.com/52dan/p/11457662.html