73 lines
4.3 KiB
Markdown
73 lines
4.3 KiB
Markdown
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---
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title: Falsy Bouncer
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localeTitle: Falsy Bouncer
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---
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![](//discourse-user-assets.s3.amazonaws.com/original/2X/5/55dedad40d9f3f662c70d1eac4effc00c7d26bd9.jpg)
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![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:")如果卡住,请记得使用**`Read-Search-Ask`** 。尝试配对程序![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:")并编写自己的代码![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":铅笔:")
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### ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:")问题说明:
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从数组中删除所有[有价值的](https://guide.freecodecamp.org/javascript/falsy-values/)值。
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#### 相关链接
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* [虚假的价值观](https://guide.freecodecamp.org/javascript/falsy-values/)
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## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:")提示:1
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Falsy是评估为FALSE的东西。 JavaScript中只有六个假值:undefined,null,NaN,0,“”(空字符串),当然还有false。
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> _现在尝试解决问题_
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## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:")提示:2
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我们需要确保我们有所有的虚假值来比较,我们可以知道它,也许有一个具有所有虚假值的函数...
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> _现在尝试解决问题_
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## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:")提示:3
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然后我们需要添加一个带有falsy值函数的`filter()` ...
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> _现在尝试解决问题_
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## 扰流警报!
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![警告牌](//discourse-user-assets.s3.amazonaws.com/original/2X/2/2d6c412a50797771301e7ceabd554cef4edcd74d.gif)
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**提前解决!**
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## ![:rotating_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/rotating_light.png?v=3 ":rotating_light:")高级代码解决方案
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```
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function bouncer(arr) {
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return arr.filter(Boolean);
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}
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```
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![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":火箭:") [运行代码](https://repl.it/CLjU/32)
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### 代码说明:
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该`Array.prototype.filter`方法需要一个返回的函数`Boolean`值,其采用单个参数,并返回`true`用于[truthy](http://forum.freecodecamp.com/t/javascript-truthy-value/15975)值或`false`用于[falsy](https://guide.freecodecamp.org/javascript/falsy-values/)值。因此,我们传递内置的`Boolean`函数。
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#### 相关链接
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* [布尔](http://forum.freecodecamp.com/t/javascript-boolean/14311)
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* [Truthy](http://forum.freecodecamp.com/t/javascript-truthy-value/15975)
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* [Array.prototype.filter()](http://forum.freecodecamp.com/t/javascript-array-prototype-filter/14289)
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## ![:trophy:](https://forum.freecodecamp.com/images/emoji/emoji_one/trophy.png?v=3 ":杯:")积分:
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如果您发现此页面有用,可以通过在主聊天上复制并粘贴此页面来表示感谢:
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**`Thanks @renelis @abhisekp @Rafase282 for your help with Algorithm: Falsy Bouncer`**
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## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":剪贴板:")捐款说明:
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* ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":警告:") **请勿**添加与任何现有解决方案类似的解决方案。如果您认为它**_相似但更好_** ,那么尝试合并(或替换)现有的类似解决方案。
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* 添加解决方案的说明。
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* 将解决方案分为以下类别之一 - **基本** , **中级**和**高级** 。 ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":红绿灯:")
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* 如果您添加了任何**相关的主要内容,**请仅添加您的用户名。 ( ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":警告:") **_不要_** _删除任何现有的用户名_ )
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> 看到![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") [**`Wiki Challenge Solution Template`**](http://forum.freecodecamp.com/t/algorithm-article-template/14272)供参考。
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