Hey Chris,
thanks for your proposal! Personally, I'm not a fan of adding such
functions. I feel they assume too much; why limit to only :ok and :error?
They of course are common in Elixir/Erlang, but one may want to return
{:value, something} or :no_values, or any other API that doesn't use :ok
and :error. Also, it's a bit restrictive to assume that we want to return
{:ok, something} instead of something like {:ok, something, something_else}
(this is what your implementation in
https://github.com/elixir-lang/elixir/pull/4650 assumed at least).
It's really trivial to implement such helper functions like these that can
be specific to your project, so I think that's where these belong :).
Andrea
Andrea Leopardi
[email protected]
On Thu, May 19, 2016 at 11:47 PM, Chris <[email protected]> wrote:
> These are a couple of small wrapper functions which I think would be very
> useful to developers. They create an idiomatic pathway for returning tuples
> from a pipeline.
>
>
> The intended use case is in any module-level function that is entirely a
> pipeline, and where you would like to return the value that is the result
> of a pipeline of functions in tuple form, and
> where you know the result of your pipeline will be either :ok or :error
> with certainty.
>
> For a simplistic example, suppose I have a list of ids and I write a
> simple function to take the first id and return it in an
> :ok tuple. Normally I would have to do something like this:
>
>
> def return_first(id_list) do
> first_id = id_list |> List.first!()
> {:ok, first_id}
> end
>
>
> And that is okay, but somehow it doesn't *feel* like idiomatic
> Elixir. Here you could just do this:
>
>
> def return_first(id_list), do: id_list |> List.first!() |> put_ok()
>
>
> To me, that feels a lot cleaner and clearer. It allows me to express my
> intention the in a way that feels closer to how Elixir
> asks me to think about programming.
>
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