Data update

Task/Menu/Elixir/menu.ex

@@ -0,0 +1,21 @@
+defmodule Menu do
+  def select(_, []), do: ""
+  def select(prompt, items) do
+    IO.puts ""
+    Enum.with_index(items) |> Enum.each(fn {item,i} -> IO.puts " #{i}. #{item}" end)
+    answer = IO.gets("#{prompt}: ") |> String.strip
+    case Integer.parse(answer) do
+      {num, ""} when num in 0..length(items)-1 -> Enum.at(items, num)
+      _ -> select(prompt, items)
+    end
+  end
+end
+
+# test empty list
+response = Menu.select("Which is empty", [])
+IO.puts "empty list returns: #{inspect response}"
+
+# "real" test
+items = ["fee fie", "huff and puff", "mirror mirror", "tick tock"]
+response = Menu.select("Which is from the three pigs", items)
+IO.puts "you chose: #{inspect response}"