80 lines
1.9 KiB
Markdown
80 lines
1.9 KiB
Markdown
---
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id: 587d7dab367417b2b2512b6f
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challengeType: 1
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forumTopicId: 301314
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localeTitle: 使用 some 方法检查数组中是否有元素是否符合条件
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---
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## Description
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<section id='description'>
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<code>some</code>方法用于检测数组中<em>任何</em>元素是否满足指定条件。如果有一个元素满足条件，返回布尔值<code>true</code>，反之返回<code>false</code>。
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举个例子，下面的代码检测数组<code>numbers</code>中是否有元素小于10：
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```js
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var numbers = [10, 50, 8, 220, 110, 11];
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numbers.some(function(currentValue) {
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return currentValue < 10;
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});
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// Returns true
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```
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</section>
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## Instructions
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<section id='instructions'>
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在<code>checkPositive</code>函数值中使用<code>some</code>检查<code>arr</code>中是否有元素为正数，函数应返回一个布尔值。
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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: 应该使用<code>some</code>method.
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testString: assert(code.match(/\.some/g));
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- text: <code>checkPositive([1, 2, 3, -4, 5])</code>应返回<code>true</code>。
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testString: assert(checkPositive([1, 2, 3, -4, 5]));
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- text: <code>checkPositive([1, 2, 3, 4, 5])</code>应返回<code>true</code>。
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testString: assert(checkPositive([1, 2, 3, 4, 5]));
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- text: <code>checkPositive([-1, -2, -3, -4, -5])</code>应返回<code>false</code>。
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testString: assert(!checkPositive([-1, -2, -3, -4, -5]));
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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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function checkPositive(arr) {
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// Add your code below this line
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return arr.some(elem => elem > 0);
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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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</section>
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