Programmer Passport: OTP

Add Some Children

Before we start children, we’re going to need a GenServer. We’ll create a few fixed characters for our server. Our nonsensical app will say a quote from a famous character. As usual, we’ll put the business logic into a functional core.

Create a Core

Let’s create the core in super_duper/core.

defmodule SuperDuper.Core do
  def say(:superdave) do
    "Next time you shoot a bullet at a metal object, watch the ricochet."
  end
  def say(:superman) do
    "It doesn't take X-Ray Vision to see you are up to no good."
  end
  def say(:supermario) do
    "Hoo hoo! Just what I needed!"
  end

  def info(name), do: {name, say(name)}
end

Our core has two pure functions. The say function has heads ...