Initial upload

elixir/captains-log/lib/captains_log.ex

@@ -0,0 +1,21 @@
+defmodule CaptainsLog do
+  @planetary_classes ["D", "H", "J", "K", "L", "M", "N", "R", "T", "Y"]
+
+  def random_planet_class() do
+    Enum.random(@planetary_classes)
+  end
+
+  def random_ship_registry_number() do
+    n = Enum.random(1000..9999)
+    "NCC-#{n}"
+  end
+
+  def random_stardate() do
+    41000.0 + :rand.uniform() * 1000
+  end
+
+  def format_stardate(stardate) when is_float(stardate) do
+    :io_lib.format("~.1f", [stardate]) |> String.Chars.to_string()
+  end
+  def format_stardate(_), do: raise ArgumentError
+end