---
id: adf08ec01beb4f99fc7a68f2
title: Falsy Bouncer
isRequired: true
challengeType: 5
videoUrl: ''
localeTitle: Falsy Bouncer
---
## Description
从数组中删除所有有价值的值。 JavaScript中的Falsy值为false ， null ， 0 ， "" ， undefined和NaN 。提示：尝试将每个值转换为布尔值。如果卡住，请记得使用Read-Search-Ask 。编写自己的代码。
## Instructions
## Tests
```yml
tests:
- text: 'bouncer([7, "ate", "", false, 9])应该返回[7, "ate", 9] 。'
testString: 'assert.deepEqual(bouncer([7, "ate", "", false, 9]), [7, "ate", 9], "bouncer([7, "ate", "", false, 9]) should return [7, "ate", 9].");'
- text: 'bouncer(["a", "b", "c"])应返回["a", "b", "c"] 。'
testString: 'assert.deepEqual(bouncer(["a", "b", "c"]), ["a", "b", "c"], "bouncer(["a", "b", "c"]) should return ["a", "b", "c"].");'
- text: 'bouncer([false, null, 0, NaN, undefined, ""])应返回[] 。'
testString: 'assert.deepEqual(bouncer([false, null, 0, NaN, undefined, ""]), [], "bouncer([false, null, 0, NaN, undefined, ""]) should return [].");'
- text: 'bouncer([1, null, NaN, 2, undefined])应该返回[1, 2] 。'
testString: 'assert.deepEqual(bouncer([1, null, NaN, 2, undefined]), [1, 2], "bouncer([1, null, NaN, 2, undefined]) should return [1, 2].");'
```
## Challenge Seed
```js
function bouncer(arr) {
// Don't show a false ID to this bouncer.
return arr;
}
bouncer([7, "ate", "", false, 9]);
```
## Solution
```js
// solution required
```