86 lines
2.0 KiB
Markdown
86 lines
2.0 KiB
Markdown
---
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id: 5a23c84252665b21eecc7edc
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title: Last Friday of each month
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challengeType: 5
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forumTopicId: 302299
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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 date of the last Friday of a given month for a given year.
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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>lastFriday</code> should be a function.
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testString: assert(typeof lastFriday == 'function');
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- text: <code>lastFriday(2018, 1)</code> should return a number.
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testString: assert(typeof lastFriday(2018, 1) == 'number');
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- text: <code>lastFriday(2018, 1)</code> should return <code>26</code>.
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testString: assert.equal(lastFriday(2018, 1), 26);
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- text: <code>lastFriday(2017, 2)</code> should return <code>24</code>.
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testString: assert.equal(lastFriday(2017, 2), 24);
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- text: <code>lastFriday(2012, 3)</code> should return <code>30</code>.
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testString: assert.equal(lastFriday(2012, 3), 30);
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- text: <code>lastFriday(1900, 4)</code> should return <code>27</code>.
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testString: assert.equal(lastFriday(1900, 4), 27);
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- text: <code>lastFriday(2000, 5)</code> should return <code>26</code>.
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testString: assert.equal(lastFriday(2000, 5), 26);
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- text: <code>lastFriday(2006, 6)</code> should return <code>30</code>.
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testString: assert.equal(lastFriday(2006, 6), 30);
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- text: <code>lastFriday(2010, 7)</code> should return <code>30</code>.
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testString: assert.equal(lastFriday(2010, 7), 30);
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- text: <code>lastFriday(2005, 8)</code> should return <code>26</code>.
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testString: assert.equal(lastFriday(2005, 8), 26);
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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 lastFriday(year, month) {
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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 lastFriday(year, month) {
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var i, last_day;
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i = 0;
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while (true) {
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last_day = new Date(year, month, i);
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if (last_day.getDay() === 5) {
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return last_day.getDate();
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}
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i -= 1;
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}
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}
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```
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</section>
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