chore(learn): Applied MDX format to Chinese curriculum files (#40462)
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---
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id: 597b2b2a2702b44414742771
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title: 阶乘
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challengeType: 5
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videoUrl: ''
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title: 阶乘
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---
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## Description
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<section id="description"><p>编写一个函数来返回一个数字的阶乘。 </p><p>一个数字的因子由下式给出: </p> N! = n *(n-1)*(n-2)* ..... * 1 <p>例如:3! = 3 * 2 * 1 = 6 4! = 4 * 3 * 2 * 1 = 24 </p><p>注意:0! = 1 </p></section>
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# --description--
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## Instructions
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<section id="instructions">
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</section>
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<p>编写一个函数来返回一个数字的阶乘。 </p><p>一个数字的因子由下式给出: </p> N! = n \*(n-1)\*(n-2)\* ..... \* 1 <p>例如:3! = 3 * 2 * 1 = 6 4! = 4 * 3 * 2 * 1 = 24 </p><p>注意:0! = 1 </p>
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## Tests
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<section id='tests'>
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# --hints--
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```yml
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tests:
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- text: <code>factorial</code>是一种功能。
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testString: assert(typeof factorial === 'function');
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- text: <code>factorial(2)</code>应该返回一个数字。
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testString: assert(typeof factorial(2) === 'number');
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- text: <code>factorial(3)</code>应该返回6.“)
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testString: assert.equal(factorial(3), 6);
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- text: <code>factorial(3)</code>应返回120.“)
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testString: assert.equal(factorial(5), 120);
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- text: '<code>factorial(3)</code>应返回3,628,800。“)'
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testString: assert.equal(factorial(10), 3628800);
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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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`factorial`是一种功能。
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```js
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function factorial (n) {
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// Good luck!
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}
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assert(typeof factorial === 'function');
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```
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</div>
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### After Test
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<div id='js-teardown'>
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`factorial(2)`应该返回一个数字。
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```js
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console.info('after the test');
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assert(typeof factorial(2) === 'number');
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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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`factorial(3)`应该返回6.“)
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```js
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// solution required
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assert.equal(factorial(3), 6);
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```
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/section>
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`factorial(3)`应返回120.“)
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```js
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assert.equal(factorial(5), 120);
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```
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`factorial(3)`应返回3,628,800。“)
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```js
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assert.equal(factorial(10), 3628800);
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```
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# --solutions--
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