95 lines
1.9 KiB
Markdown
95 lines
1.9 KiB
Markdown
---
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id: 587d7b8a367417b2b2512b4d
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title: 使用解构赋值将对象作为函数的参数传递
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challengeType: 1
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forumTopicId: 301217
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dashedName: use-destructuring-assignment-to-pass-an-object-as-a-functions-parameters
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---
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# --description--
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在某些情况下，你可以在函数的参数里直接解构对象。
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请看以下代码：
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```js
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const profileUpdate = (profileData) => {
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const { name, age, nationality, location } = profileData;
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// do something with these variables
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}
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```
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上面的操作解构了传给函数的对象。这样的操作也可以直接在参数里完成：
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```js
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const profileUpdate = ({ name, age, nationality, location }) => {
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/* do something with these fields */
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}
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```
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这样的操作去除了多余的代码，使代码更加整洁。 这样做还有个额外的好处：函数不需要再去操作整个对象，而仅仅是操作复制到函数作用域内部的参数。
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# --instructions--
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对`half`的参数进行解构赋值，使得仅仅将`max`与`min`的值传进函数。
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# --hints--
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`stats`的类型应该是一个`object`。
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```js
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assert(typeof stats === 'object');
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```
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`half(stats)`应该等于`28.015`
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```js
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assert(half(stats) === 28.015);
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```
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应该使用解构赋值。
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```js
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assert(code.replace(/\s/g, '').match(/half=\({\w+,\w+}\)/));
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```
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应该使用解构参数。
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```js
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assert(!code.match(/stats\.max|stats\.min/));
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```
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# --seed--
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## --seed-contents--
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```js
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const stats = {
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max: 56.78,
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standard_deviation: 4.34,
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median: 34.54,
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mode: 23.87,
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min: -0.75,
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average: 35.85
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};
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// Only change code below this line
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const half = (stats) => (stats.max + stats.min) / 2.0;
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// Only change code above this line
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```
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# --solutions--
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```js
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const stats = {
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max: 56.78,
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standard_deviation: 4.34,
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median: 34.54,
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mode: 23.87,
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min: -0.75,
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average: 35.85
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};
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const half = ( {max, min} ) => (max + min) / 2.0;
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```
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