72 lines
1.9 KiB
Markdown
72 lines
1.9 KiB
Markdown
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---
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title: Greatest common divisor
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id: 5a23c84252665b21eecc7e82
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challengeType: 5
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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'',''<code>gcd</code> should be a 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'',''<code>gcd(24,36)</code> should return a 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,''<code>gcd(24,36)</code> should return <code>12</code>.'');'
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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,''<code>gcd(30,48)</code> should return <code>6</code>.'');'
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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,''<code>gcd(10,15)</code> should return <code>5</code>.'');'
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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,''<code>gcd(100,25)</code> should return <code>25</code>.'');'
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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,''<code>gcd(13,250)</code> should return <code>1</code>.'');'
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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,''<code>gcd(1300,250)</code> should return <code>50</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 gcd(a, b) {
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// Good luck!
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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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