Golf Betting Software Development: Everything You Need to Know
<https://www.brsoftech.com/blog/golf-betting-software-development/>
On Thu, Sep 8, 2022 at 5:01 PM virtual-light <rainbi...@gmail.com> wrote:
> Proposal to expand Enum.split_with/2 with post-process function option
> similar to how it implemented in Enum.group_by/3 with third argument.
>
> In my experience it is an often case when you need to split a enum through
> a function with a spec like:
>
> @spec foo(term) :: {:ok, result_t} | {:error, error_t}
>
> and receive two enums, where one contains successful results and another
> contains errors like: {list(result_t), list(error_t)}.
>
> Enum.map/2 + Enum.split_by/2 seems to be a good choice for this work but
> unfortunately split_by it doesn't support post-process function (like third
> argument of Enum.group_by/3 does) so result of applying Enum.split_with/2
> will be: {list({:ok, result_t}, list({:error, error_t})} instead.
>
> I propose to expand Enum.split_with to this signature:
> @spec split_with(t <https://hexdocs.pm/elixir/Enum.html#t:t/0>(), (element
> <https://hexdocs.pm/elixir/Enum.html#t:element/0>() -> as_boolean
> <https://hexdocs.pm/elixir/typespecs.html#built-in-types>(term
> <https://hexdocs.pm/elixir/typespecs.html#built-in-types>())), (element
> <https://hexdocs.pm/elixir/Enum.html#t:element/0>() -> any
> <https://hexdocs.pm/elixir/typespecs.html#basic-types>())) :: {list
> <https://hexdocs.pm/elixir/typespecs.html#built-in-types>(), list
> <https://hexdocs.pm/elixir/typespecs.html#built-in-types>()}
> split_with(enumerable, split_fun, transform_fun \\ fn x -> x end)
>
> so it can be used like this:
>
> {successful_results, errors} =
> mu_enum
> |> Enum.map(&foo/1)
> |> Enum.split_by(& match?({:ok, _}, &1), fn {_, res} -> res end)
>
> Because of lack of transform_fun in current implementation an additional
> step needed:
> {Enum.map(successful_results, fn {_, res} -> res end), Enum.map(errors, fn
> {_, res} -> res end)}.
>
> --
> You received this message because you are subscribed to the Google Groups
> "elixir-lang-core" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to elixir-lang-core+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/elixir-lang-core/3f87090e-b4ae-44d5-b81a-5cf645271440n%40googlegroups.com
> <https://groups.google.com/d/msgid/elixir-lang-core/3f87090e-b4ae-44d5-b81a-5cf645271440n%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
>
--
You received this message because you are subscribed to the Google Groups
"elixir-lang-core" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to elixir-lang-core+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/elixir-lang-core/CABUB1NQj6EAqxb8exvxU2Uw%2BweJrXC6yAq6SL1A%2BoFSmw2H9Nw%40mail.gmail.com.
