66 lines
1.9 KiB
Markdown
66 lines
1.9 KiB
Markdown
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---
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id: 5a23c84252665b21eecc8040
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title: Sum multiples of 3 and 5
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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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The objective is to write a function that finds the sum of all positive multiples of 3 or 5 below <i>n</i>.
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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>sumMults</code> should be a function.
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testString: assert(typeof sumMults == 'function', '<code>sumMults</code> should be a function.');
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- text: <code>sumMults(10)</code> should return a number.
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testString: assert(typeof sumMults(10) == 'number', '<code>sumMults(10)</code> should return a number.');
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- text: <code>sumMults(10)</code> should return <code>23</code>.
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testString: assert.equal(sumMults(10), 23, '<code>sumMults(10)</code> should return <code>23</code>.');
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- text: <code>sumMults(100)</code> should return <code>2318</code>.
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testString: assert.equal(sumMults(100), 2318, '<code>sumMults(100)</code> should return <code>2318</code>.');
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- text: <code>sumMults(1000)</code> should return <code>233168</code>.
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testString: assert.equal(sumMults(1000), 233168, '<code>sumMults(1000)</code> should return <code>233168</code>.');
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- text: <code>sumMults(10000)</code> should return <code>23331668</code>.
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testString: assert.equal(sumMults(10000), 23331668, '<code>sumMults(10000)</code> should return <code>23331668</code>.');
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- text: <code>sumMults(100000)</code> should return <code>2333316668</code>.
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testString: assert.equal(sumMults(100000), 2333316668, '<code>sumMults(100000)</code> should return <code>2333316668</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 sumMults (n) {
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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 sumMults (n) {
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var sum = 0;
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for (var i = 1; i < n; i++) {
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if (i % 3 == 0 || i % 5 == 0) sum += i;
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}
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return sum;
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}
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```
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</section>
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