Cart Example

cart.ex

defmodule Cart do
  def start() do
    {:ok, cart} = Agent.start(fn -> ["Seconds - by Bryan Lee O'Malley"] end)
    cart
  end

  def print_cart(items) do
    Enum.each(items, fn item -> IO.puts "Item: #{item}" end)
  end

  def show(cart) do
    Agent.get(cart, fn(items) -> print_cart(items) end)
  end

  def add_item(cart, item) do
    Agent.update(cart, fn(items) -> [item | items] end)
  end
end