64 lines
2.2 KiB
Markdown
64 lines
2.2 KiB
Markdown
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---
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id: 587d7da9367417b2b2512b66
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title: Combine Two Arrays Using the concat Method
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challengeType: 1
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videoUrl: ''
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localeTitle: 使用concat方法组合两个数组
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---
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## Description
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<section id="description"> <code>Concatenation</code>意味着端到端地连接项目。 JavaScript为字符串和数组提供了以相同方式工作的<code>concat</code>方法。对于数组，该方法在一个上调用，然后另一个数组作为<code>concat</code>的参数提供，该数组被添加到第一个数组的末尾。它返回一个新数组，不会改变任何一个原始数组。这是一个例子： <blockquote> [1,2,3] .concat（[4,5,6]）; <br> //返回一个新数组[1,2,3,4,5,6] </blockquote></section>
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## Instructions
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<section id="instructions">使用<code>nonMutatingConcat</code>函数中的<code>concat</code>方法<code>attach</code>到<code>original</code>的结尾。该函数应返回连接数组。 </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: 您的代码应使用<code>concat</code>方法。
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testString: 'assert(code.match(/\.concat/g), "Your code should use the <code>concat</code> method.");'
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- text: 第<code>first</code>数组不应该改变。
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testString: 'assert(JSON.stringify(first) === JSON.stringify([1, 2, 3]), "The <code>first</code> array should not change.");'
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- text: <code>second</code>数组不应该改变。
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testString: 'assert(JSON.stringify(second) === JSON.stringify([4, 5]), "The <code>second</code> array should not change.");'
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- text: '<code>nonMutatingConcat([1, 2, 3], [4, 5])</code>应该返回<code>[1, 2, 3, 4, 5]</code> 。'
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testString: 'assert(JSON.stringify(nonMutatingConcat([1, 2, 3], [4, 5])) === JSON.stringify([1, 2, 3, 4, 5]), "<code>nonMutatingConcat([1, 2, 3], [4, 5])</code> should return <code>[1, 2, 3, 4, 5]</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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function nonMutatingConcat(original, attach) {
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// Add your code below this line
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// Add your code above this line
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}
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var first = [1, 2, 3];
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var second = [4, 5];
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nonMutatingConcat(first, second);
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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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