60 lines
2.6 KiB
Markdown
60 lines
2.6 KiB
Markdown
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---
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id: afd15382cdfb22c9efe8b7de
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title: DNA Pairing
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isRequired: true
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challengeType: 5
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videoUrl: ''
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localeTitle: DNA配对
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---
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## Description
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<section id="description"> DNA链缺少配对元素。获取每个字符，获取其对，并将结果作为二维数组返回。 <a href="http://en.wikipedia.org/wiki/Base_pair" target="_blank">碱基对</a>是一对AT和CG。将缺少的元素与提供的字符匹配。将提供的字符作为每个数组中的第一个元素返回。例如，对于输入GCG，返回[[“G”，“C”]，[“C”，“G”]，[“G”，“C”]]字符及其对在一个中配对数组，并将所有数组分组到一个封装数组中。如果卡住，请记得使用<a href="http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514" target="_blank">Read-Search-Ask</a> 。尝试配对程序。编写自己的代码。 </section>
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## Instructions
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<section id="instructions">
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</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: '<code>pairElement("ATCGA")</code>应返回<code>[["A","T"],["T","A"],["C","G"],["G","C"],["A","T"]]</code> 。'
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testString: 'assert.deepEqual(pairElement("ATCGA"),[["A","T"],["T","A"],["C","G"],["G","C"],["A","T"]], "<code>pairElement("ATCGA")</code> should return <code>[["A","T"],["T","A"],["C","G"],["G","C"],["A","T"]]</code>.");'
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- text: '<code>pairElement("TTGAG")</code>应返回<code>[["T","A"],["T","A"],["G","C"],["A","T"],["G","C"]]</code> 。'
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testString: 'assert.deepEqual(pairElement("TTGAG"),[["T","A"],["T","A"],["G","C"],["A","T"],["G","C"]], "<code>pairElement("TTGAG")</code> should return <code>[["T","A"],["T","A"],["G","C"],["A","T"],["G","C"]]</code>.");'
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- text: '<code>pairElement("CTCTA")</code>应返回<code>[["C","G"],["T","A"],["C","G"],["T","A"],["A","T"]]</code> 。'
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testString: 'assert.deepEqual(pairElement("CTCTA"),[["C","G"],["T","A"],["C","G"],["T","A"],["A","T"]], "<code>pairElement("CTCTA")</code> should return <code>[["C","G"],["T","A"],["C","G"],["T","A"],["A","T"]]</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 pairElement(str) {
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return str;
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}
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pairElement("GCG");
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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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