如何通过将值作为另一个对象的键来创建新对象？答案

【问题标题】：How to create new object by making a value as key from another object?如何通过将值作为另一个对象的键来创建新对象？
【发布时间】：2019-11-22 11:26:08
【问题描述】：

我有一个对象，我试图通过将所有相同的值作为键来创建一个新对象。例如，

data = [
    {
        "sum(PendingBenNotValidated)": 35.0,
        "stateName": "Andaman & Nicobar Islands",
        "diagMonth": 4,
        "diagYear": 2018,
        "TypeOfPatient": "IndiaTbPrivate"
    },
    {
        "sum(PendingBenNotValidated)": 8.0,
        "stateName": "Andaman & Nicobar Islands",
        "diagMonth": 5,
        "diagYear": 2018,
        "TypeOfPatient": "IndiaTbPrivate"
    },
    {
        "sum(PendingBenNotValidated)": 19.0,
        "stateName": "Andaman & Nicobar Islands",
        "diagMonth": 7,
        "diagYear": 2018,
        "TypeOfPatient": "IndiaTbPrivate"
    },
    {
        "sum(PendingBenNotValidated)": 16.0,
        "stateName": "Andaman & Nicobar Islands",
        "diagMonth": 8,
        "diagYear": 2018,
        "TypeOfPatient": "IndiaTbPrivate"
    },
    {
        "sum(PendingBenNotValidated)": 1.0,
        "stateName": "Andhra Pradesh",
        "diagMonth": 1,
        "diagYear": 2018,
        "TypeOfPatient": "IndiaTbPrivate"
    },
    {
        "sum(PendingBenNotValidated)": 0.0,
        "stateName": "Andhra Pradesh",
        "diagMonth": 2,
        "diagYear": 2018,
        "TypeOfPatient": "IndiaTbPrivate"
    }]

我必须使用 stateName 作为键来获取我的新对象，如下所示：

new data = [{Andaman & Nicobar Islands: [{PendingBenNotValidated: 35, diagMonth: 4, diagYear: 2018, TypeOfPatient: "IndiaTbPrivate"},{PendingBenNotValidated: 19, diagMonth: 7, diagYear: 2018, TypeOfPatient: "IndiaTbPrivate"}], Andhra Pradesh: [{PendingBenNotValidated: 0, , diagMonth: 2, diagYear: 2018, TypeOfPatient: "IndiaTbPrivate"}]

关于如何做到这一点的任何想法？

【问题讨论】：

你有任何代码尝试这样做吗？您应该尝试迭代 data 数组并通过 item 键将项目存储在另一个对象中
首先data不是一个有效的对象。先解决这个问题，这样我们才能准确地知道你的对象是什么样子

标签： javascript arrays dictionary lodash

【解决方案1】：

首先，您需要修复您的 data 属性，因为它无效。然后您只需遍历数组并根据stateName 属性生成一个新对象。

var data = [
{PendingBenNotValidated: 35, stateName: "Andaman & Nicobar Islands", diagMonth: 4, diagYear: 2018, TypeOfPatient: "IndiaTbPrivate"},
{PendingBenNotValidated: 8, stateName: "Andaman & Nicobar Islands", diagMonth: 5, diagYear: 2018, TypeOfPatient: "IndiaTbPrivate"},
{PendingBenNotValidated: 19, stateName: "Andaman & Nicobar Islands", diagMonth: 7, diagYear: 2018, TypeOfPatient: "IndiaTbPrivate"},
{PendingBenNotValidated: 16, stateName: "Andaman & Nicobar Islands", diagMonth: 8, diagYear: 2018, TypeOfPatient: "IndiaTbPrivate"},
{PendingBenNotValidated: 9, stateName: "Andaman & Nicobar Islands", diagMonth: 9, diagYear: 2018, TypeOfPatient: "IndiaTbPrivate"},
{PendingBenNotValidated: 9, stateName: "Andaman & Nicobar Islands", diagMonth: 10, diagYear: 2018, TypeOfPatient: "IndiaTbPrivate"},
{PendingBenNotValidated: 16, stateName: "Andaman & Nicobar Islands", diagMonth: 11, diagYear: 2018, TypeOfPatient: "IndiaTbPrivate"},
{PendingBenNotValidated: 12, stateName: "Andaman & Nicobar Islands", diagMonth: 12, diagYear: 2018, TypeOfPatient: "IndiaTbPrivate"},
{PendingBenNotValidated: 1, stateName: "Andhra Pradesh", diagMonth: 1, diagYear: 2018, TypeOfPatient: "IndiaTbPrivate"},
{PendingBenNotValidated: 0, stateName: "Andhra Pradesh", diagMonth: 2, diagYear: 2018, TypeOfPatient: "IndiaTbPrivate"}];

let entries = {};
data.map( (e) => entries[e.stateName] = e );
console.log(entries);

【讨论】：