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Last Friday of each month

curriculum/challenges/english/blocks/rosetta-code-challenges/5a23c84252665b21eecc7edc.md

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--description--

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

--hints--

lastFriday should be a function.

js
assert(typeof lastFriday == 'function');

lastFriday(2018, 1) should return a number.

js
assert(typeof lastFriday(2018, 1) == 'number');

lastFriday(2018, 1) should return 26.

js
assert.equal(lastFriday(2018, 1), 26);

lastFriday(2017, 2) should return 24.

js
assert.equal(lastFriday(2017, 2), 24);

lastFriday(2012, 3) should return 30.

js
assert.equal(lastFriday(2012, 3), 30);

lastFriday(1900, 4) should return 27.

js
assert.equal(lastFriday(1900, 4), 27);

lastFriday(2000, 5) should return 26.

js
assert.equal(lastFriday(2000, 5), 26);

lastFriday(2006, 6) should return 30.

js
assert.equal(lastFriday(2006, 6), 30);

lastFriday(2010, 7) should return 30.

js
assert.equal(lastFriday(2010, 7), 30);

lastFriday(2005, 8) should return 26.

js
assert.equal(lastFriday(2005, 8), 26);

--seed--

--seed-contents--

js
function lastFriday(year, month) {

}

--solutions--

js
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;
  }
}