bob

elixir/bob/lib/bob.ex

@@ -0,0 +1,23 @@
+defmodule Bob do
+  @spec hey(String.t()) :: String.t()
+  def hey(input) do
+    trimmed = String.trim(input)
+
+    is_yell? = String.upcase(trimmed) == trimmed and String.downcase(trimmed) != trimmed
+    is_question? = String.ends_with?(trimmed, "?")
+    is_silence? = trimmed == ""
+
+    cond do
+      is_silence? ->
+        "Fine. Be that way!"
+      is_yell? and is_question? ->
+        "Calm down, I know what I'm doing!"
+      is_question? ->
+        "Sure."
+      is_yell? ->
+        "Whoa, chill out!"
+      true ->
+        "Whatever."
+    end
+  end
+end