Initial upload

elixir/secret-handshake/lib/secret_handshake.ex

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+defmodule SecretHandshake do
+  @doc """
+  Determine the actions of a secret handshake based on the binary
+  representation of the given `code`.
+
+  If the following bits are set, include the corresponding action in your list
+  of commands, in order from lowest to highest.
+
+  1 = wink
+  10 = double blink
+  100 = close your eyes
+  1000 = jump
+
+  10000 = Reverse the order of the operations in the secret handshake
+  """
+  def commands(code) do
+    code
+    |> Integer.digits(2)
+    |> Enum.reverse()
+    |> Enum.with_index()
+    |> Enum.reduce([], fn {bit, index}, acc ->
+      if bit == 1 do
+        add_action(index, acc)
+      else
+        acc
+      end
+    end)
+    |> Enum.reverse()
+  end
+
+
+  defp add_action(0, acc), do: ["wink" | acc]
+  defp add_action(1, acc), do: ["double blink" | acc]
+  defp add_action(2, acc), do: ["close your eyes" | acc]
+  defp add_action(3, acc), do: ["jump" | acc]
+  defp add_action(4, acc), do: Enum.reverse(acc)
+  defp add_action(_, acc), do: acc
+end