javascript - 从已删除/重复的对象中提取属性，然后分配给其他对象

Question

我在这里需要一点帮助，你有这个数组:

[
   {Code:13938, Country:699, Name:"Crocs", codeProduct:1}
   {Code:13952, Country:699, Name:"Polo Club", codeProduct:14}
   {Code:13952, Country:699, Name:"Polo Club", codeProduct:1}
   {Code:13952, Country:699, Name:"Polo Club", codeProduct:3}
   {Code:13953, Country:699, Name:"OZ", codeProduct:12}
   ....
]

我需要转换成这样:

[
   {Code:13938, Country:699, Name:"Crocs", codeProduct:1}
   {Code:13952, Country:699, Name:"Polo Club", codeProduct:"14, 1, 3" }
   {Code:13953, Country:699, Name:"Polo Club", codeProduct:12}
]

我可以毫无问题地删除重复的对象并获取这些删除的对象的值。

var prodArray = [];

function uniq_fast(a) {
   var seen = {};
   var out = [];
   var len = a.length;
   var j = 0;
   for(var i = 0; i < len; i++) {
     var item = a[i].Codigo;
     if(seen[item] !== 1) {
           seen[item] = 1;
           out[j++] = a[i];
     }else{
        prodArray.push({Code:item, codeProduct:a[i].TipoProductoCodigo});
     }
   }
      return out;
   }

这将返回一个新的对象数组，其中不包含重复的值，并将已删除对象的属性添加到新数组 prodArray 中。

// out return this:
[
  {Code:13938, Country:699, Name:"Crocs", codeProduct:1}
  {Code:13952, Country:699, Name:"Polo Club", codeProduct:"14, 1, 3" }
  {Code:13953, Country:699, Name:"Polo Club", codeProduct:12}

]

和prodArr返回这个:

[
    {Code:13952, codeProduct:1}
    {Code:13952, codeProduct:3}
]

但是我如何将 prodArray 中的属性设置为保存不重复对象的新数组？

希望我已经说清楚了

Answer 1

您可以使用哈希表作为对代码的引用。

var data = [{ Code: 13938, Country: 699, Name: "Crocs", codeProduct: 1 },  { Code: 13952, Country: 699, Name: "Polo Club", codeProduct: 14 }, { Code: 13952, Country: 699, Name: "Polo Club", codeProduct: 1 }, { Code: 13952, Country: 699, Name: "Polo Club", codeProduct: 3 }, { Code: 13953, Country: 699, Name: "OZ", codeProduct: 12 }],
    grouped = [];

data.forEach(function (a) {
    if (!this[a.Code]) {
        this[a.Code] = { Code: a.Code, Country: a.Country, Name: a.Name, codeProduct: a.codeProduct };
        grouped.push(this[a.Code]);
        return;
    }
    this[a.Code].codeProduct += ', ' + a.codeProduct;
}, Object.create(null));
console.log(grouped);