freeCodeCamp/curriculum/challenges/chinese/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-to-pass-an-object-as-a-functions-parameters.chinese.md
ZhichengChen 83957bb150
fix(i18n): update Chinese translation of es6 (#38038)
Co-authored-by: Zhicheng Chen <chenzhicheng@dayuwuxian.com>
2020-08-04 12:43:35 +05:30

2.3 KiB

id, title, challengeType, forumTopicId, localeTitle
id title challengeType forumTopicId localeTitle
587d7b8a367417b2b2512b4d Use Destructuring Assignment to Pass an Object as a Function's Parameters 1 301217 使用解构赋值将对象作为函数的参数传递

Description

在某些情况下,你可以在函数的参数里直接解构对象。 请看以下代码:
const profileUpdate = (profileData) => {
  const { name, age, nationality, location } = profileData;
  // do something with these variables
}

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:

const profileUpdate = ({ name, age, nationality, location }) => {
  /* do something with these fields */
}

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。

Instructions

half的参数进行解构赋值,使得仅仅将maxmin的值传进函数。

Tests

tests:
  - text: <code>stats</code>的类型应该是一个<code>object</code>。
    testString: assert(typeof stats === 'object');
  - text: <code>half(stats)</code>应该等于<code>28.015</code>
    testString: assert(half(stats) === 28.015);
  - text: 应该使用解构赋值。
    testString: assert(code.replace(/\s/g, '').match(/half=\({\w+,\w+}\)/));
  - text: 应该使用解构参数。
    testString: assert(!code.match(/stats\.max|stats\.min/));

Challenge Seed

const stats = {
  max: 56.78,
  standard_deviation: 4.34,
  median: 34.54,
  mode: 23.87,
  min: -0.75,
  average: 35.85
};

// change code below this line
const half = (stats) => (stats.max + stats.min) / 2.0; // use function argument destructuring
// change code above this line

console.log(stats); // should be object
console.log(half(stats)); // should be 28.015

Solution

const stats = {
  max: 56.78,
  standard_deviation: 4.34,
  median: 34.54,
  mode: 23.87,
  min: -0.75,
  average: 35.85
};

const half = ( {max, min} ) => (max + min) / 2.0;