17 lines
513 B
Elixir
17 lines
513 B
Elixir
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defmodule Year do
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@doc """
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Returns whether 'year' is a leap year.
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A leap year occurs:
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on every year that is evenly divisible by 4
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except every year that is evenly divisible by 100
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unless the year is also evenly divisible by 400
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"""
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@spec leap_year?(non_neg_integer) :: boolean
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def leap_year?(year) when rem(year, 400) == 0, do: true
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def leap_year?(year) when rem(year, 100) == 0, do: false
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def leap_year?(year) when rem(year, 4) == 0, do: true
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def leap_year?(_year), do: false
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end
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