展平嵌套的对象数组,将键重命名为迭代器 [英] Flatten nested array of objects, renaming keys to an iterator
问题描述
我有一个对象数组,每个对象如下所示(轮询响应):
I have an array of objects, with each object looking like the following (a poll response):
{
"slug": "18-AZ-Gov-GE-DvF",
"name": "2018 Arizona Gubernatorial GE",
"tags": [],
"charts": [],
"election_date": "2018-11-06",
"n_polls": 1,
"created_at": "2017-06-13T13:32:26.000Z",
"responses": [
{
"label": "Ducey",
"name": "Doug Ducey",
"party": "Republican",
"incumbent": true
},
{
"label": "Farley",
"name": "Steve Farley",
"party": "Democrat",
"incumbent": false
},
{
"label": "Other",
"name": "Other",
"party": null,
"incumbent": false
},
{
"label": "Undecided",
"name": "Undecided",
"party": null,
"incumbent": false
}
]
},
我需要展平通过 response
键访问的数组,以便每个对象锁定为其迭代器。
I need to flatten the array accessed by the responses
key so that each object keyed to its iterator.
最终对象应类似于:
{
"slug": "18-AZ-Gov-GE-DvF",
"name": "2018 Arizona Gubernatorial GE",
"tags": [],
"charts": [],
"election_date": "2018-11-06",
"n_polls": 1,
"created_at": "2017-06-13T13:32:26.000Z",
"label1": "Ducey",
"name1": "Doug Ducey",
"party1": "Republican",
"incumbent1": true
"label2": "Farley",
"name2": "Steve Farley",
"party2": "Democrat",
"incumbent2": false
"label3": "Other",
"name3": "Other",
"party3": null,
"incumbent3": false
"label4": "Undecided",
"name4": "Undecided",
"party4": null,
"incumbent4": false
},
我见过的答案在展平或在集合上执行时不会重命名对象键。
The answers I've seen do not rename the object keys when flattening or are performed on a collection.
我已经尝试了几种解决方案,但想在真正投入使用之前先看看是否有简单的es6方法。
I've tried several solutions, but wanted to see if there's an easy es6 way before I really dive in.
推荐答案
一种方法将使用一些较新的功能,包括 价差
, 销毁任务
, 模板文字
, 条目
,最重要的是 reduce
。
One approach would use a few of the newer goodies including spread
, destructuring assignment
, template literals
, entries
and most importantly reduce
.
主要要点是使用减速器转换响应
数组到一个新对象,每个元素对象都使用辅助约简器来修改带有迭代器计数的键,并使用新键将值分配给外部对象。
The main gist is using a reducer to convert the responses
array to a new object with each element object using a secondary reducer to amend the key with the iterator count and assigning the value to the outer object with the new key.
此方法的一个主要好处是原始对象(包括其子对象)没有被修改(读取:无副作用)。
A key benefit of this approach is the original object (including its sub-objects) are not modified (read: no side-effects).
const flattened = responses.reduce((o, g, i) => {
Object.entries(g).reduce((t, [k, v]) => {
t[`${k}${i + 1}`] = v;
return t;
}, o);
return o;
},
{});
完整的示例:
const orig = {
"slug": "18-AZ-Gov-GE-DvF",
"name": "2018 Arizona Gubernatorial GE",
"tags": [],
"charts": [],
"election_date": "2018-11-06",
"n_polls": 1,
"created_at": "2017-06-13T13:32:26.000Z",
"responses": [{
"label": "Ducey",
"name": "Doug Ducey",
"party": "Republican",
"incumbent": true
},
{
"label": "Farley",
"name": "Steve Farley",
"party": "Democrat",
"incumbent": false
},
{
"label": "Other",
"name": "Other",
"party": null,
"incumbent": false
},
{
"label": "Undecided",
"name": "Undecided",
"party": null,
"incumbent": false
}
]
};
const {responses, ...foo} = orig;
const flattened = responses.reduce((o, g, i) => {
Object.entries(g).reduce((t, [k, v]) => {
t[`${k}${i + 1}`] = v;
return t;
}, o);
return o;
},
{});
console.log({flattened: {...foo, ...flattened}});
console.log({orig});
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