But then why not simply pipe to the result afterwards? This is all possible
today already:
for(...) |> Enum.join(", ")
for(...) |> then(&Enum.join(&1, ", "))
for do
...
end |> then(&Enum.join(&1, ", "))
*José Valimhttps://dashbit.co/ <https://dashbit.co/>*
On Fri, Nov 15, 2024 at 11:13 AM Christian Blavier <cblav...@gmail.com>
wrote:
> My point wasn’t about adding a join but a then option (like Kernel.then),
> which seems much more versatile.
>
> Whatever I was expecting a no :)
> Le 15 nov. 2024 à 11:10 +0100, José Valim <jose.va...@gmail.com>, a écrit
> :
>
> It is the same answer as before, I am afraid. The path to adding :join is
> also the path to adding :intersperse, and :sum, and :product, etc. We
> should have a general mechanism for expressing those, instead of individual
> options.
>
> And, as before, a joiner does not really work well with into and reduce.
>
>
> *José Valim*
> https://dashbit.co/
>
>
> On Fri, Nov 15, 2024 at 11:06 AM Christian Blavier <cblav...@gmail.com>
> wrote:
>
>> Hey there,
>>
>> I'm still thinking about extending comprehension. What about a `then`
>> option?
>>
>> for i <- 1..3, do: i, then: &Enum.sum/1
>>
>> for s <- ~w(a b c), do: s, then: &Enum.join(&1, ", ")
>>
>> (I know this can be achieved more efficiently with a reduce, but
>> sometimes concise syntax is a better choice)
>>
>> Le mardi 21 juin 2022 à 18:40:46 UTC+2, José Valim a écrit :
>>
>>> It should probably be done with using `into: joiner(",")`, where the
>>> joiner implements the collectable protocol. join itself probably doesn't
>>> make much sense because it doesn't play well with other options such as
>>> :into itself, or :reduce.
>>>
>>> On Tue, Jun 21, 2022 at 6:15 PM Christian Blavier <cbla...@gmail.com>
>>> wrote:
>>>
>>>> Do you think a join option would be a good idea for comprehensions?
>>>> Something like Enum.map_join/2 that could map and join lists in a
>>>> single pass.
>>>> book_ids = for book <- books, join: ",", do: book.id
>>>>
>>>> If it looks like a good idea, I will open a PR.
>>>>
>>>> Best,
>>>>
>>>> Christian
>>>>
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