Module and Functions

Learn to build a state machine with one state at a time. We will do this in the order that the states follow as the game progresses.

Start with a catchall clause

Our goal is to build a whitelist, but we still need to account for all the error cases that won’t match it. A catchall clause helps with this. Therefore, we will define a catchall clause in this section.

Let’s start with a new file at lib/islands_engine/rules.ex. We define the IslandsEngine.Rules module in it and alias it as well:

defmodule IslandsEngine.Rules do
  alias __MODULE__

Get hands-on with 1200+ tech skills courses.