如何 union/group 对象数组的相同值和一些属性？

Question

我有一些数组：

[
  {
    billable: 1,
    source: "Facebook",
    providerAccountId: 5,
    message_id: "5bb1a457"
  },
  {
    billable: 1,
    source: "Facebook",
    providerAccountId: 5,
    message_id: "6bb3G465"
  },
  {
    destination: "8801856472841"
    message_id: "5bb1a457"
  }
]

//after union, i need to get result:
 
[
  {
    billable: 1,
    source: "Facebook",
    providerAccountId: 5,
    message_id: "5bb1a457"
    destination: "8801856472841"
  },
  {
    billable: 1,
    source: "Facebook",
    providerAccountId: 5,
    message_id: "6bb3G465"
  }
]

请帮忙，myabe 是否可以通过具有唯一值的属性进行分组或联合。只是将所有具有相同值的对象通过指定的 peoperty 和缺少的属性添加到连接的对象中

Answer 1

您可以遍历数组并在应用已插入对象的属性时对其进行过滤。

该提议使用一个（真正的）空对象作为哈希表来引用被过滤的对象。如果存在具有相同 message_id 的对象，则将实际对象的所有属性分配给具有散列的对象。

var array = [{ billable: 1, source: "Facebook", providerAccountId: 5, message_id: "5bb1a457" }, { billable: 1, source: "Facebook", providerAccountId: 5, message_id: "6bb3G465" }, { destination: "8801856472841", message_id: "5bb1a457" }];

array = array.filter(function (a) {
    if (!this[a.message_id]) {
        this[a.message_id] = a;
        return true;
    }
    Object.keys(a).forEach(function (k) {
        this[k] = a[k];
    }, this[a.message_id]);
}, Object.create(null));

console.log(array);

Answer 2

您可以通过您要检查的键映射它并最终合并它：

var d = [
  {
    billable: 1,
    source: "Facebook",
    providerAccountId: 5,
    message_id: "5bb1a457"
  },
  {
    billable: 1,
    source: "Facebook",
    providerAccountId: 5,
    message_id: "6bb3G465"
  },
  {
    destination: "8801856472841",
    message_id: "5bb1a457"
  }
];

var res =  d.reduce((ac,x) => {
   if (ac[x.message_id])
     Object.assign(ac[x.message_id],x); //if you want to preserve original use a new object as target
   else
     ac[x.message_id]=x;
   return ac;
 },{})

// and then you can map it back to array
var res2 = Object.keys(res).map(x => res[x]) 

console.log(res)
console.log(res2)

如何 union/group 对象数组的相同值和一些属性？

How to union/group array of objects by same values and by some property?

javascript

underscore.js

如何 union/group 对象数组的相同值和一些 属性？

How to union/group array of objects by same values and by some property?

javascript

underscore.js

如何 union/group 对象数组的相同值和一些属性？