62 lines
2.2 KiB
Markdown
62 lines
2.2 KiB
Markdown
---
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id: 587d7dab367417b2b2512b6e
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title: Use the every Method to Check that Every Element in an Array Meets a Criteria
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challengeType: 1
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videoUrl: ''
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localeTitle: 使用every方法检查数组中的每个元素是否符合条件
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---
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## Description
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<section id="description"> <code>every</code>方法都使用数组来检查<em>每个</em>元素是否通过了特定的测试。它返回一个布尔值 - 如果所有值都满足条件，则返回<code>true</code>否则返回<code>false</code> 。例如，以下代码将检查<code>numbers</code>数组中的每个元素是否小于10： <blockquote> var numbers = [1,5,8,0,10,11]; <br> numbers.every（function（currentValue）{ <br> return currentValue <10; <br> }）; <br> //返回false </blockquote></section>
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## Instructions
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<section id="instructions">使用<code>checkPositive</code>函数中的<code>every</code>方法检查<code>arr</code>每个元素是否为正数。该函数应返回一个布尔值。 </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: 您的代码应该使用<code>every</code>方法。
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testString: 'assert(code.match(/\.every/g), "Your code should use the <code>every</code> method.");'
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- text: '<code>checkPositive([1, 2, 3, -4, 5])</code>应该返回<code>false</code> 。'
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testString: 'assert(!checkPositive([1, 2, 3, -4, 5]), "<code>checkPositive([1, 2, 3, -4, 5])</code> should return <code>false</code>.");'
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- text: '<code>checkPositive([1, 2, 3, 4, 5])</code>应该返回<code>true</code> 。'
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testString: 'assert(checkPositive([1, 2, 3, 4, 5]), "<code>checkPositive([1, 2, 3, 4, 5])</code> should return <code>true</code>.");'
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- text: '<code>checkPositive([1, -2, 3, -4, 5])</code>应该返回<code>false</code> 。'
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testString: 'assert(!checkPositive([1, -2, 3, -4, 5]), "<code>checkPositive([1, -2, 3, -4, 5])</code> should return <code>false</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 checkPositive(arr) {
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// Add your code below this line
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// Add your code above this line
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}
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checkPositive([1, 2, 3, -4, 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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