如何通過子值將對象數組拆分為多個對象數組

Question

我需要按其對象子值（類型）拆分Array。 假設我有以下數組：

[
  {id:1,name:"John",information: { type :"employee"}},
  {id:2,name:"Charles",information: { type :"employee"}},
  {id:3,name:"Emma",information: { type :"ceo"}},
  {id:4,name:"Jane",information: { type :"customer"}}
]

我想按信息類型拆分對象，所以最終結果如下所示：

[
 {
  type:"employee",
  persons:
  [
   {id:1,name:"John",information: { ... }},
   {id:2,name:"Charles",information: { ... }
  ]
 },
{
  type:"ceo",
  persons:
  [
   {id:3,name:"Emma",information: { ... }}
  ]
 },
{
  type:"customer",
  persons:
  [
   {id:4,name:"Jane",information: { ... }}
  ]
 }, 
]

下划線在我的項目中可用。 可以包括任何其他幫助程序庫。

當然，我可以遍歷數組並實現自己的邏輯，但我一直在尋找更清潔的解決方案。

Answer 1

這恰好返回您想要的：

_.pairs(_.groupBy(originalArray, v => v.information.type)).map(p => ({type: p[0], persons: p[1]}))

Answer 2

您可以使用underscore.js的groupBy函數 ：

var empList = [
{id:1,name:"John",information: { type :"employee"}},
  {id:2,name:"Charles",information: { type :"employee"}},
  {id:3,name:"Emma",information: { type :"ceo"}},
  {id:4,name:"Jane",information: { type :"customer"}}
];
_.groupBy(empList, function(emp){ return emp.information.type; });

Answer 3

使用純Javascript的解決方案，為組提供一個臨時對象。

 var array = [{ id: 1, name: "John", information: { type: "employee" } }, { id: 2, name: "Charles", information: { type: "employee" } }, { id: 3, name: "Emma", information: { type: "ceo" } }, { id: 4, name: "Jane", information: { type: "customer" } }], result = []; array.forEach(function (a) { var type = a.information.type; if (!this[type]) { this[type] = { type: type, persons: [] }; result.push(this[type]); } this[type].persons.push({ id: a.id, name: a.name }); }, {}); document.write('<pre>' + JSON.stringify(result, 0, 4) + '</pre>');