ES6-解构分配-将某些属性从现有对象解压缩到新对象? [英] ES6 - Destructuring assignment - Unpack some properties from existing object to a new object?

问题描述

是否可以将一个对象的某些键解压缩到一个新对象中?

Is it possible to unpack some of the keys of an object to a new object?

比方说，我要将3个键(a，b，c)从test对象复制到新对象(abc).下面提到的代码将起作用.

Let's say, I want to copy 3 of the keys (a, b, c) from test object to a new object (abc). Below mention code will work.

const test = {a:1, b:2, c:3, d:4, e:5 };
const {a, b, c} = test;
const abc = { a, b, c, f: 6};

有什么方法可以在一个语句中完成?

还有另一种方法.

const test = {a:1, b:2, c:3, d:4, e:5 };
const abc = { ...test, f: 6};

但是使用这种方法，以后我将不得不删除不需要的密钥(在我的情况下为d，e).

But with this approach, I would later have to delete the unwanted keys (d, e in my case).

(最佳方案:如果我们不必跟踪不需要的密钥.不需要的密钥可以有n个.)

(Best Case Solution: If we don't have to keep track of unwanted keys. There can be n number of unwanted keys.)

推荐答案

您可以使用

You can use object rest to destructure your initial object:

const test = {a:1, b:2, c:3, d:4, e:5 };
const {d, e, ...abc} = { ...test, f: 6};

console.log(abc);

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