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Add Rot13 in Elixir #6077

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Merged
rzuckerm merged 1 commit into from
Jun 16, 2026
+16 −0
Merged

Add Rot13 in Elixir #6077

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16 changes: 16 additions & 0 deletions archive/e/elixir/rot13.ex
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Original file line number Diff line number Diff line change
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defmodule Rot13 do
@doc """
Returns a string after applying the Rot-13 cypher
"""
@spec rot13(str :: String.t()) :: String.t()
def rot13(str), do: to_charlist(str) |> Enum.map(&rot/1) |> to_string()

defp rot(char) when char in ?a..?z, do: rem(char - ?a + 13, 26) + ?a
defp rot(char) when char in ?A..?Z, do: rem(char - ?A + 13, 26) + ?A
defp rot(char), do: char
end

case System.argv() do
[str] when byte_size(str) > 0 -> Rot13.rot13(str) |> IO.puts()
_ -> IO.puts("Usage: please provide a string to encrypt")
end