Elixir

Other Elixir solutions.

defmodule RotationalCipher do
  @doc """
  Given a plaintext and amount to shift by, return a rotated string.

  Example:
  iex> RotationalCipher.rotate("Attack at dawn", 13)
  "Nggnpx ng qnja"
  """
  @spec rotate(text :: String.t(), shift :: integer) :: String.t()
  def rotate(text, shift) do
  end
end

Roc

Other Roc solutions.

module [rotate]

rotate : Str, U8 -> Str
rotate = \text, shiftKey ->
    text
    |> Str.toUtf8
    |> List.map \c -> rotateChar c shiftKey
    |> Str.fromUtf8
    |> Result.withDefault ""

rotateChar : U8, U8 -> U8
rotateChar = \char, shiftKey ->
    if char >= 'A' && char <= 'Z' then
        (char - 'A' + shiftKey) % 26 + 'A'
    else if char >= 'a' && char <= 'z' then
        (char - 'a' + shiftKey) % 26 + 'a'
    else
        char