24 lines
1 KiB
Elixir
24 lines
1 KiB
Elixir
defmodule Raindrops do
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@doc """
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Returns a string based on raindrop factors.
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- If the number contains 3 as a prime factor, output 'Pling'.
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- If the number contains 5 as a prime factor, output 'Plang'.
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- If the number contains 7 as a prime factor, output 'Plong'.
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- If the number does not contain 3, 5, or 7 as a prime factor,
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just pass the number's digits straight through.
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"""
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@spec convert(pos_integer) :: String.t
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def convert(number) do
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case number do
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number when (rem(number, 3) == 0 and rem(number, 5) == 0 and rem(number, 7) == 0) -> "PlingPlangPlong"
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number when (rem(number, 3) == 0 and rem(number, 5) == 0) -> "PlingPlang"
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number when (rem(number, 3) == 0 and rem(number, 7) == 0) -> "PlingPlong"
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number when (rem(number, 5) == 0 and rem(number, 7) == 0) -> "PlangPlong"
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number when (rem(number, 3) == 0) -> "Pling"
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number when (rem(number, 5) == 0) -> "Plang"
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number when (rem(number, 7) == 0) -> "Plong"
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_ -> Integer.to_string(number)
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end
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end
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end
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