81 lines
2.3 KiB
Markdown
81 lines
2.3 KiB
Markdown
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---
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id: a5229172f011153519423690
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title: Sum All Odd Fibonacci Numbers
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isRequired: true
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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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Given a positive integer <code>num</code>, return the sum of all odd Fibonacci numbers that are less than or equal to <code>num</code>.
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The first two numbers in the Fibonacci sequence are 1 and 1. Every additional number in the sequence is the sum of the two previous numbers. The first six numbers of the Fibonacci sequence are 1, 1, 2, 3, 5 and 8.
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For example, <code>sumFibs(10)</code> should return <code>10</code> because all odd Fibonacci numbers less than or equal to <code>10</code> are 1, 1, 3, and 5.
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Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514' target='_blank'>Read-Search-Ask</a> if you get stuck. Try to pair program. Write your own code.
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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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- text: <code>sumFibs(1)</code> should return a number.
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testString: 'assert(typeof sumFibs(1) === "number", "<code>sumFibs(1)</code> should return a number.");'
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- text: <code>sumFibs(1000)</code> should return 1785.
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testString: 'assert(sumFibs(1000) === 1785, "<code>sumFibs(1000)</code> should return 1785.");'
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- text: <code>sumFibs(4000000)</code> should return 4613732.
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testString: 'assert(sumFibs(4000000) === 4613732, "<code>sumFibs(4000000)</code> should return 4613732.");'
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- text: <code>sumFibs(4)</code> should return 5.
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testString: 'assert(sumFibs(4) === 5, "<code>sumFibs(4)</code> should return 5.");'
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- text: <code>sumFibs(75024)</code> should return 60696.
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testString: 'assert(sumFibs(75024) === 60696, "<code>sumFibs(75024)</code> should return 60696.");'
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- text: <code>sumFibs(75025)</code> should return 135721.
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testString: 'assert(sumFibs(75025) === 135721, "<code>sumFibs(75025)</code> should return 135721.");'
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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 sumFibs(num) {
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return num;
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}
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sumFibs(4);
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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 sumFibs(num) {
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var a = 1;
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var b = 1;
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var s = 0;
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while (a <= num) {
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if (a % 2 !== 0) {
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s += a;
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}
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a = [b, b=b+a][0];
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}
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return s;
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}
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```
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</section>
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