---
id: 587d7b89367417b2b2512b4a
title: Use Destructuring Assignment to Assign Variables from Nested Objects
challengeType: 1
videoUrl: ''
localeTitle: 使用解构分配从嵌套对象分配变量
---
## Description
我们可以类似地将嵌套对象解构为变量。请考虑以下代码： const a = {
开始：{x：5，y：6}，
结束：{x：6，y：-9}
};
const {start：{x：startX，y：startY}} = a;
console.log（startX，startY）; // 5,6
在上面的示例中，变量start被赋予a.start的值，该值也是一个对象。
## Instructions
用解构赋值来获得max的forecast.tomorrow并将其分配给maxOfTomorrow 。
## Tests
```yml
tests:
- text: maxOfTomorrow等于84.6
testString: 'assert(getMaxOfTmrw(LOCAL_FORECAST) === 84.6, "maxOfTomorrow equals 84.6");'
- text: 使用嵌套解构
testString: 'getUserInput => assert(getUserInput("index").match(/\{\s*tomorrow\s*:\s*\{\s*max\s*:\s*maxOfTomorrow\s*\}\s*\}\s*=\s*forecast/g),"nested destructuring was used");'
```
## Challenge Seed
```js
const LOCAL_FORECAST = {
today: { min: 72, max: 83 },
tomorrow: { min: 73.3, max: 84.6 }
};
function getMaxOfTmrw(forecast) {
"use strict";
// change code below this line
const maxOfTomorrow = undefined; // change this line
// change code above this line
return maxOfTomorrow;
}
console.log(getMaxOfTmrw(LOCAL_FORECAST)); // should be 84.6
```
## Solution
```js
// solution required
```