58 lines
2.9 KiB
Markdown
58 lines
2.9 KiB
Markdown
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---
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id: 587d7b7e367417b2b2512b20
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title: Use an Array to Store a Collection of Data
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challengeType: 1
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videoUrl: ''
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localeTitle: 使用数组存储数据集合
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---
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## Description
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<section id="description">以下是阵列数据结构最简单实现的示例。这被称为<dfn>一维数组</dfn> ,意味着它只有一个级别,或者它没有嵌套在其中的任何其他数组。请注意,它包含<dfn>布尔值</dfn> , <dfn>字符串</dfn>和<dfn>数字</dfn> ,以及其他有效的JavaScript数据类型: <blockquote> let simpleArray = ['one',2,'three',true,false,undefined,null]; <br>的console.log(simpleArray.length); <br> //记录7 </blockquote>所有数组都有一个length属性,如上所示,可以使用语法<code>Array.length</code>轻松访问<code>Array.length</code> 。下面可以看到更复杂的数组实现。这称为<dfn>多维数组</dfn> ,或包含其他数组的数组。请注意,此数组还包含JavaScript <dfn>对象</dfn> ,我们将在下一节中详细介绍,但是现在,您需要知道的是,数组也能够存储复杂对象。 <blockquote>让complexArray = [ <br> [ <br> { <br>一:1, <br>二:2 <br> }, <br> { <br>三:3, <br>四:4 <br> } <br> ] <br> [ <br> { <br> a:“a”, <br> b:“b” <br> }, <br> { <br> c:“c”, <br> d:“d” <br> } <br> ] <br> ]。 </blockquote></section>
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## Instructions
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<section id="instructions">我们定义了一个名为<code>yourArray</code>的变量。通过为<code>yourArray</code>变量指定长度至少为5个元素的数组来完成该语句。您的数组应至少包含一个<dfn>字符串</dfn> ,一个<dfn>数字</dfn>和一个<dfn>布尔值</dfn> 。 </section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: yourArray是一个数组
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testString: 'assert.strictEqual(Array.isArray(yourArray), true, "yourArray is an array");'
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- text: <code>yourArray</code>至少有5个元素
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testString: 'assert.isAtLeast(yourArray.length, 5, "<code>yourArray</code> is at least 5 elements long");'
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- text: <code>yourArray</code>至少包含一个<code>boolean</code>
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testString: 'assert(yourArray.filter( el => typeof el === "boolean").length >= 1, "<code>yourArray</code> contains at least one <code>boolean</code>");'
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- text: <code>yourArray</code>至少包含一个<code>number</code>
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testString: 'assert(yourArray.filter( el => typeof el === "number").length >= 1, "<code>yourArray</code> contains at least one <code>number</code>");'
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- text: <code>yourArray</code>至少包含一个<code>string</code>
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testString: 'assert(yourArray.filter( el => typeof el === "string").length >= 1, "<code>yourArray</code> contains at least one <code>string</code>");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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let yourArray; // change this line
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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