pattern matching the function input

raisinsaregross.exs

defmodule Food do
    def test_food(%{ name: "raisins"} = food) do
        "The food is tiny, gross #{food.name}. It tastes #{food.taste}."
    end

    def test_food(food) do
        "The food is #{food.name}. It tastes #{food.taste}."
    end    
end

raisins = %{ name: "raisins", taste: "bad" }
pizza = %{ name: "Pizza", taste: "good"}

Food.test_food(pizza) |> IO.puts
Food.test_food(raisins) |> IO.puts