Odd implementation of leap year logic. Spot how this could have been expressed much simpler.

leap_year.rb

class Year
  def self.leap?(year)
    if year % 4 == 0 || year % 400 == 0
      if year % 100 == 0 && year % 400 == 0
        true
      elsif year % 100 == 0
        false
      else
        true
      end
    else 
      false
    end
  end
end