63 lines
2.2 KiB
Markdown
63 lines
2.2 KiB
Markdown
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---
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id: adf08ec01beb4f99fc7a68f2
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title: Falsy Bouncer
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isRequired: true
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challengeType: 5
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videoUrl: ''
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localeTitle: Falsy Bouncer
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---
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## Description
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<section id="description">从数组中删除所有有价值的值。 JavaScript中的Falsy值为<code>false</code> ， <code>null</code> ， <code>0</code> ， <code>""</code> ， <code>undefined</code>和<code>NaN</code> 。提示：尝试将每个值转换为布尔值。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>bouncer([7, "ate", "", false, 9])</code>应该返回<code>[7, "ate", 9]</code> 。'
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testString: 'assert.deepEqual(bouncer([7, "ate", "", false, 9]), [7, "ate", 9], "<code>bouncer([7, "ate", "", false, 9])</code> should return <code>[7, "ate", 9]</code>.");'
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- text: '<code>bouncer(["a", "b", "c"])</code>应返回<code>["a", "b", "c"]</code> 。'
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testString: 'assert.deepEqual(bouncer(["a", "b", "c"]), ["a", "b", "c"], "<code>bouncer(["a", "b", "c"])</code> should return <code>["a", "b", "c"]</code>.");'
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- text: '<code>bouncer([false, null, 0, NaN, undefined, ""])</code>应返回<code>[]</code> 。'
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testString: 'assert.deepEqual(bouncer([false, null, 0, NaN, undefined, ""]), [], "<code>bouncer([false, null, 0, NaN, undefined, ""])</code> should return <code>[]</code>.");'
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- text: '<code>bouncer([1, null, NaN, 2, undefined])</code>应该返回<code>[1, 2]</code> 。'
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testString: 'assert.deepEqual(bouncer([1, null, NaN, 2, undefined]), [1, 2], "<code>bouncer([1, null, NaN, 2, undefined])</code> should return <code>[1, 2]</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 bouncer(arr) {
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// Don't show a false ID to this bouncer.
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return arr;
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}
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bouncer([7, "ate", "", false, 9]);
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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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