80 lines
2.0 KiB
Markdown
80 lines
2.0 KiB
Markdown
---
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id: 587d7dab367417b2b2512b6f
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title: Use the some Method to Check that Any Elements in an Array Meet a Criteria
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challengeType: 1
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forumTopicId: 301314
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---
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## Description
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<section id='description'>
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The <code>some</code> method works with arrays to check if <em>any</em> element passes a particular test. It returns a Boolean value - <code>true</code> if any of the values meet the criteria, <code>false</code> if not.
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For example, the following code would check if any element in the <code>numbers</code> array is less than 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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Use the <code>some</code> method inside the <code>checkPositive</code> function to check if any element in <code>arr</code> is positive. The function should return a Boolean value.
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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: Your code should use the <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> should return <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> should return <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> should return <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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