64 lines
1.9 KiB
Markdown
64 lines
1.9 KiB
Markdown
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---
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id: a302f7aae1aa3152a5b413bc
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title: Factorialize a Number
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isRequired: true
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challengeType: 5
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videoUrl: ''
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localeTitle: 对一个数字进行推理
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---
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## Description
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<section id="description">返回提供的整数的阶乘。如果整数用字母n表示，则阶乘是所有小于或等于n的正整数的乘积。因子通常用简写符号<code>n!</code>表示<code>n!</code>例如： <code>5! = 1 * 2 * 3 * 4 * 5 = 120</code>只有大于或等于零的整数才会被提供给该函数。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> 。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>factorialize(5)</code>应该返回一个数字。
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testString: 'assert(typeof factorialize(5) === "number", "<code>factorialize(5)</code> should return a number.");'
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- text: <code>factorialize(5)</code>应该返回120。
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testString: 'assert(factorialize(5) === 120, "<code>factorialize(5)</code> should return 120.");'
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- text: <code>factorialize(10)</code>应返回3628800。
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testString: 'assert(factorialize(10) === 3628800, "<code>factorialize(10)</code> should return 3628800.");'
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- text: <code>factorialize(20)</code>应该返回2432902008176640000。
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testString: 'assert(factorialize(20) === 2432902008176640000, "<code>factorialize(20)</code> should return 2432902008176640000.");'
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- text: <code>factorialize(0)</code>应该返回1。
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testString: 'assert(factorialize(0) === 1, "<code>factorialize(0)</code> should return 1.");'
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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 factorialize(num) {
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return num;
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}
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factorialize(5);
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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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