在 javascript 中总结 JSON 对象的值

Question

我有一个返回数据的 API，例如：

{
        "attributes": {
            "type": "Opportunity"
        },
        "Amount": 175.36,
        "Owner": {
            "attributes": {
                "type": "User"
            },
            "Name": "Steve Knight"
        }
    },

    {
        "attributes": {
            "type": "Opportunity"
        },
        "Amount": 6800,
        "Owner": {
            "attributes": {
                "type": "User"
            },
            "Name": "Bob Smith"
        }
    }
etc...

这些代表机会，因此每个销售人员都会有多个。 我正在尝试返回一个对象，该对象对每个销售人员的金额求和并返回如下内容：

{Steve Knight: 5590, Bob Smith: 98722, John Jones: 12347893}

我尝试按所有者名称对对象进行分组，但是我不确定如何对金额求和

var groupBy = require('lodash.groupby');

var grouped = groupBy(data, function(x) {
        return x.Owner.Name;
      });

Answer 1

最好使用Array.prototype的reduce方法

 console.clear(); (function() { "use strict"; function reduce(coll, elem, idx, arr) { coll[elem.Owner.Name] = coll[elem.Owner.Name] || 0; coll[elem.Owner.Name] += elem.Amount return coll; } const data = [ { attributes: { type: "Opportunity" }, Amount: 175.36, Owner: { attributes: { type: "User" }, Name: "Steve Knight" } }, { attributes: { type: "Opportunity" }, Amount: 100.16, Owner: { attributes: { type: "User" }, Name: "John Doe" } }, { attributes: { type: "Opportunity" }, Amount: 6.00, Owner: { attributes: { type: "User" }, Name: "John Doe" } }, { attributes: { type: "Opportunity" }, Amount: 101.65, Owner: { attributes: { type: "User" }, Name: "Steve Knight" } }, { attributes: { type: "Opportunity" }, Amount: 6800, Owner: { attributes: { type: "User" }, Name: "Bob Smith" } } ]; const reducedData = data.reduce(reduce, {}) console.log(reducedData) }());

Answer 2

如果键名存在，则将已经存在的值累加到新的值中，否则只需添加初始值和名称

 const arr = [{ "attributes": { "type": "Opportunity" }, "Amount": 175.36, "Owner": { "attributes": { "type": "User" }, "Name": "Steve Knight" } }, { "attributes": { "type": "Opportunity" }, "Amount": 100, "Owner": { "attributes": { "type": "User" }, "Name": "Steve Knight" } }, { "attributes": { "type": "Opportunity" }, "Amount": 6800, "Owner": { "attributes": { "type": "User" }, "Name": "Bob Smith" } } ] const result = arr.reduce((acc, x) => { const key = x.Owner.Name; const amount = x['Amount']; if (!acc[key]) { acc[key] = amount; } else { acc[key] = acc[key] + amount; } return acc; }, {}); console.log(result)

Answer 3

你可以在下面试试这个：

let output = {}
data.map(function (item) {
    if (output.hasOwnProperty(item.Owner.Name)) {
            output[item.Owner.Name] = item.Amount;
    } else {
            output[item.Owner.Name] += item.Amount;
    }
 });