Specs

bimap(Witchcraft.Bifunctor.t(), (any() -> any()), (any() -> any())) ::
  Witchcraft.Bifunctor.t()

map separate fuctions over two fields in a product type.

The order of fields doesn't always matter in the map. The first/second function application is determined by the instance. It also does not have to map all fields in a product type.

Diagram

          ┌------------------------------------┐
          ↓                                    |
%Combo{a: 5, b: :ok, c: "hello"} |> bimap(&(&1 * 100), &String.upcase/1)
                            ↑                                 |
                            └---------------------------------┘
#=> %Combo{a: 500, b: :ok, c: "HELLO"}

Examples

iex> {1, "a"} |> bimap(&(&1 * 100), &(&1 <> "!"))
{100, "a!"}

iex> {:msg, 42, "number is below 50"}
...> |> bimap(&(%{subject: &1}), &String.upcase/1)
{:msg, %{subject: 42}, "NUMBER IS BELOW 50"}