Generating Specials

Generating the list of specials

We’ll start with the list of specials since it’s conceptually simpler and a prerequisite of other generators. The method here is to first extract the list of all item names from the price list, and then create a matching table of specials. Let’s take a look at how it can be done.

defp special_list(price_list) do
  items = for {name, _} <- price_list, do: name

  let specials <- list({elements(items), choose(2, 5), integer()}) do
    sorted = Enum.sort(specials)
    Enum.dedup_by(sorted, fn {x, _, _} -> x end)
  end
end

The generated list of specials contains the name of the item, how many of them ...