Leap

Welcome to Leap on Exercism's Haskell Track. If you need help running the tests or submitting your code, check out HELP.md.

Instructions

Given a year, report if it is a leap year.

The tricky thing here is that a leap year in the Gregorian calendar occurs:

on every year that is evenly divisible by 4
  except every year that is evenly divisible by 100
    unless the year is also evenly divisible by 400

For example, 1997 is not a leap year, but 1996 is. 1900 is not a leap year, but 2000 is.

Though our exercise adopts some very simple rules, there is more to learn!

For a delightful, four minute explanation of the whole leap year phenomenon, go watch this youtube video.

To complete this exercise you need to implement the function isLeapYear that takes a year and determines whether it is a leap year.