17 lines
515 B
Elixir
17 lines
515 B
Elixir
defmodule Year do
|
|
@doc """
|
|
Returns whether 'year' is a leap year.
|
|
|
|
A leap year 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
|
|
"""
|
|
@spec leap_year?(non_neg_integer) :: boolean
|
|
def leap_year?(year) when rem(year, 400) == 0, do: true
|
|
def leap_year?(year) when rem(year, 100) == 0, do: false
|
|
def leap_year?(year) when rem(year, 4) == 0, do: true
|
|
def leap_year?(_year), do: false
|
|
end
|