在线等！现在有如下数组，我要把数组的格式改变成如下这个，如何实现呢？

Question

constarr=[{id:1,name:"小明",age:18,dreid:50},{id:2,name:"大热",age:18,dreid:52},{id:4,name:"妇女会计",age:18,dreid:51},{id:3,name:"千万",age:18,dreid:53},{id:1,name:"小强",age:18,dreid:51},{id:3,name:"千的",age:18,dreid:50},{id:2,name:"大巴",age:18,dreid:53},{id:4,name:"妇女放假",age:18,dreid:52},]我要把id相等的放在一个数组，dreid相等的放在一个数组变为这样的，数组的长度是不同id的长度letarr=[{dreid:50,//dreid相等的都放在listDreid数组中listDreid:[{id:1,name:"小明",age:18,dreid:50},{id:3,name:"千的",age:18,dreid:50},],id:1,//id相等的放在listId数组中listId:[{id:1,name:"小明",age:18,dreid:50},{id:1,name:"小强",age:18,dreid:51},]},{dreid:51,//dreid相等的都放在listDreid数组中listDreid:[{id:4,name:"妇女会计",age:18,dreid:51},{id:1,name:"小强",age:18,dreid:51},],id:2,//id相等的放在listId数组中listId:[{id:2,name:"大热",age:18,dreid:52},{id:2,name:"大巴",age:18,dreid:53},]},{dreid:52,//dreid相等的都放在listDreid数组中listDreid:[{id:2,name:"大热",age:18,dreid:52},{id:4,name:"妇女放假",age:18,dreid:52}],id:3,//id相等的放在listId数组中listId:[{id:3,name:"千万",age:18,dreid:53},{id:3,name:"千的",age:18,dreid:50},]},{dreid:53,//dreid相等的都放在listDreid数组中listDreid:[{id:3,name:"千万",age:18,dreid:53},{d:2,name:"大巴",age:18,dreid:53}],id:4,//id相等的放在listId数组中listId:[{id:4,name:"妇女会计",age:18,dreid:51},{id:4,name:"妇女放假",age:18,dreid:52},]}];这个怎么实现呢？

Answer 1

functiontransform(arr){
varret=[];
if(Array.isArray(arr)&&arr.length){
loop:for(vari=0;ivara=arr[i];
varid=a.id;
vardreid=a.dreid;
varisFound=0;
for(varj=0;jvarb=ret[j];
if(b.id===id){
b.listId.push(a);
isFound++;
}elseif(b.dreid===dreid){
b.listDreid.push(a);
isFound++
}
}
if(!isFound)ret.push({
id:id,
listId:[a],
dreid:dreid,
listDreid:[a]
});
}
}
returnret;
}
console.log(transform(arr));
                            

Answer 2

letres=[]
arr.forEach((item,index)=>{
letid=item['id'];
letdreid=item['dreid'];
letlistId=[]
letlistDreid=[]
arr.forEach((item1)=>{
if(item1['id']==index+1){
listId.push(item1)
}
if(dreid==item1['dreid']){
listDreid.push(item1)
}
})
res.push({
dreid:dreid,
listDreid:listDreid,
id:id,
listId:listId
})
})