Learn Functional Programming with Elixir

Answers for Chapter 5, Using Higher-Order Functions

• The EnchanterShop module should look like this:

  higher_order_functions/answers/exercise_1.ex

  defmodule EnchanterShop do
    def test_data do
      [
        %{title: "Longsword", price: 50, magic: false},
        %{title: "Healing Potion", price: 60, magic: true},
        %{title: "Rope", price: 10, magic: false},
        %{title: "Dragon's Spear", price: 100, magic: true},
      ]
    end
    @enchanter_name "Edwin"
  
    def enchant_for_sale(items) do
      Enum.map(items, &transform/1)
    end
  
    defp transform(item = %{magic: true}), do: item
    defp transform(item) do
      %{
        title: "#{@enchanter_name}'s #{item.title}",
        price: item.price * 3,