Another update from ingydotnet^djgoku

Task/Five-weekends/CoffeeScript/five-weekends-1.coffee

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+startsOnFriday = (month, year) ->
+  # 0 is Sunday, 1 is Monday, ... 5 is Friday, 6 is Saturday
+  new Date(year, month, 1).getDay() == 5
+
+has31Days = (month, year) ->
+  new Date(year, month, 31).getDate() == 31
+
+checkMonths = (year) ->
+  month = undefined
+  count = 0
+  month = 0
+  while month < 12
+    if startsOnFriday(month, year) and has31Days(month, year)
+      count += 1
+      console.log year + ' ' + month + ''
+    month += 1
+  count
+
+fiveWeekends = ->
+  startYear = 1900
+  endYear = 2100
+  year = undefined
+  monthTotal = 0
+  yearsWithoutFiveWeekends = []
+  total = 0
+  year = startYear
+  while year <= endYear
+    monthTotal = checkMonths(year)
+    total += monthTotal
+    # extra credit
+    if monthTotal == 0
+      yearsWithoutFiveWeekends.push year
+    year += 1
+  console.log 'Total number of months: ' + total + ''
+  console.log ''
+  console.log yearsWithoutFiveWeekends + ''
+  console.log 'Years with no five-weekend months: ' + yearsWithoutFiveWeekends.length + ''
+  return
+
+fiveWeekends()

Task/Five-weekends/CoffeeScript/five-weekends-2.coffee

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+1901 2
+1902 7
+1903 4
+1904 0
+1904 6
+1905 11
+1907 2
+1908 4
+1909 0
+1909 9
+1910 6
+1911 11
+1912 2
+1913 7
+1914 4
+1915 0
+1915 9
+1916 11
+1918 2
+1919 7
+1920 9
+1921 6
+1922 11
+1924 7
+..
+
+Total number of months: 201
+1900,1906,1917,1923,1928,1934,1945,1951,1956,1962,1973,1979,1984,1990,2001,2007,2012,2018,2029,2035,2040,2046,2057,2063,2068,2074,2085,2091,2096
+
+Years with no five-weekend months: 29