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20 changes: 20 additions & 0 deletions solutions/elixir/leap/1/lib/year.ex
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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) do
cond do
rem(year, 400) == 0 -> true
rem(year, 100) == 0 -> false
rem(year, 4) == 0 -> true
true -> false
end
end
end