Captain's Log - Elixir - Exercism

captains_log.ex

defmodule CaptainsLog do
  @planetary_classes ["D", "H", "J", "K", "L", "M", "N", "R", "T", "Y"]

  @spec random_planet_class() :: String.t()
  def random_planet_class(), do: Enum.random(@planetary_classes)

  @spec random_ship_registry_number() :: String.t()
  def random_ship_registry_number(), do: "NCC-#{Enum.random(1000..9999)}"

  @spec random_stardate() :: float
  def random_stardate(), do: 41000.0 + (42000.0 - 41000.0) * :rand.uniform()

  @spec format_stardate(Float.t()) :: String.t()
  def format_stardate(stardate), do: :io_lib.format("~.1f", [stardate]) |> List.to_string()
end