[英]how to split array of objects into multiple array of objects by subvalue
I need to split an Array by its objects subvalue (type). 我需要按其对象子值(类型)拆分Array。 Let's assume I have following array:
假设我有以下数组:
[
{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"}}
]
and I want to split the object by information.type so my final result looks like: 我想按信息类型拆分对象,所以最终结果如下所示:
[
{
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: { ... }}
]
},
]
Underscore is available at my Project. 下划线在我的项目中可用。 Any other helper library could be included.
可以包括任何其他帮助程序库。
Of course I could loop through the array and implement my own logic, but i was looking for cleaner solution. 当然,我可以遍历数组并实现自己的逻辑,但我一直在寻找更清洁的解决方案。
这恰好返回您想要的:
_.pairs(_.groupBy(originalArray, v => v.information.type)).map(p => ({type: p[0], persons: p[1]}))
You could use the groupBy
function of underscore.js : 您可以使用underscore.js的
groupBy
函数 :
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; });
A solution in plain Javascript with a temporary object for the groups. 使用纯Javascript的解决方案,为组提供一个临时对象。
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>');
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