73 lines
1.4 KiB
Markdown
73 lines
1.4 KiB
Markdown
---
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title: Greatest common divisor
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id: 5a23c84252665b21eecc7e82
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challengeType: 5
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forumTopicId: 302277
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---
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## Description
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<section id='description'>
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Write a function that returns the greatest common divisor of two integers.
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</section>
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## Instructions
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<section id='instructions'>
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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: <code>gcd</code> should be a function.
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testString: assert(typeof gcd=='function');
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- text: <code>gcd(24,36)</code> should return a number.
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testString: assert(typeof gcd(24,36)=='number');
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- text: <code>gcd(24,36)</code> should return <code>12</code>.
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testString: assert.equal(gcd(24,36),12);
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- text: <code>gcd(30,48)</code> should return <code>6</code>.
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testString: assert.equal(gcd(30,48),6);
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- text: <code>gcd(10,15)</code> should return <code>5</code>.
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testString: assert.equal(gcd(10,15),5);
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- text: <code>gcd(100,25)</code> should return <code>25</code>.
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testString: assert.equal(gcd(100,25),25);
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- text: <code>gcd(13,250)</code> should return <code>1</code>.
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testString: assert.equal(gcd(13,250),1);
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- text: <code>gcd(1300,250)</code> should return <code>50</code>.
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testString: assert.equal(gcd(1300,250),50);
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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 gcd(a, b) {
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}
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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 gcd(a, b) {
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return b==0 ? Math.abs(a):gcd(b, a % b);
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}
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```
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</section>
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