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freeCodeCamp/curriculum/challenges/english/08-coding-interview-prep/rosetta-code/last-friday-of-each-month.md
Bhanu Pratap Singh Rathore 79394d141f feat(interview-prep): Converting and transferring Rosetta problems (#35487) 
* feat(interview-prep): Converting and transferring Rosetta problems

* feat(interview-prep): Fixing challenges

* fix(challenges): Added code tags

* Update knight's-tour.md

Moved text to instructions section and fixed a small typo.

* feat(interview-prep): Update description of Knight's tour

Co-Authored-By: NitronR <bhanur05@gmail.com>

* feat(interview-prep): Update description of Kaprekar numbers

Co-Authored-By: NitronR <bhanur05@gmail.com>

* feat(inteview-prep): Kaprekar numbers description

Added <code> tags.

* fix(interview-prep): Update description Kaprekar Numbers

Co-Authored-By: NitronR <bhanur05@gmail.com>

* fix(interview-prep): Added code tags Kaprekar numbers

Co-Authored-By: NitronR <bhanur05@gmail.com>
2019-03-21 11:52:35 +05:30

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id, title, challengeType
id title challengeType
5a23c84252665b21eecc7edc Last Friday of each month 5

Description

Write a function that returns the date of the last Friday of a given month for a given year.

Instructions

Tests

tests:
  - text: <code>lastFriday</code> should be a function.
    testString: assert(typeof lastFriday == 'function', '<code>lastFriday</code> should be a function.');
  - text: <code>lastFriday(2018, 1)</code> should return a number.
    testString: assert(typeof lastFriday(2018, 1) == 'number', '<code>lastFriday(2018, 1)</code> should return a number.');
  - text: <code>lastFriday(2018, 1)</code> should return <code>26</code>.
    testString: assert.equal(lastFriday(2018, 1), 26, '<code>lastFriday(2018, 1)</code> should return <code>26</code>.');
  - text: <code>lastFriday(2017, 2)</code> should return <code>24</code>.
    testString: assert.equal(lastFriday(2017, 2), 24, '<code>lastFriday(2017, 2)</code> should return <code>24</code>.');
  - text: <code>lastFriday(2012, 3)</code> should return <code>30</code>.
    testString: assert.equal(lastFriday(2012, 3), 30, '<code>lastFriday(2012, 3)</code> should return <code>30</code>.');
  - text: <code>lastFriday(1900, 4)</code> should return <code>27</code>.
    testString: assert.equal(lastFriday(1900, 4), 27, '<code>lastFriday(1900, 4)</code> should return <code>27</code>.');
  - text: <code>lastFriday(2000, 5)</code> should return <code>26</code>.
    testString: assert.equal(lastFriday(2000, 5), 26, '<code>lastFriday(2000, 5)</code> should return <code>26</code>.');
  - text: <code>lastFriday(2006, 6)</code> should return <code>30</code>.
    testString: assert.equal(lastFriday(2006, 6), 30, '<code>lastFriday(2006, 6)</code> should return <code>30</code>.');
  - text: <code>lastFriday(2010, 7)</code> should return <code>30</code>.
    testString: assert.equal(lastFriday(2010, 7), 30, '<code>lastFriday(2010, 7)</code> should return <code>30</code>.');
  - text: <code>lastFriday(2005, 8)</code> should return <code>26</code>.
    testString: assert.equal(lastFriday(2005, 8), 26, '<code>lastFriday(2005, 8)</code> should return <code>26</code>.');

Challenge Seed

function lastFriday(year, month) {
  // Good luck!
}

Solution

function lastFriday (year, month) {
  var i, last_day;
  i = 0;
  while (true) {
    last_day = new Date(year, month, i);
    if (last_day.getDay() === 5) {
      return last_day.getDate();
    }
    i -= 1;
  }
};