I have also one proposal to for loops:
reverse: true
for applies already the reverse and when I don't care about the order, or
want to reverse the result anyway then it has to be reversed twice.
It would be a nice addition that could add a small bit of performance in
some cases. Also it should not conflict with existing features?.
On Friday, November 15, 2024 at 3:16:04 PM UTC+1 cbla...@gmail.com wrote:
> What I'm proposing, is only syntaxic sugar.
>
> I don't like piping comprehension's result. It looks less readable than
> piping with regular Enum functions.
> Le 15 nov. 2024 à 12:42 +0100, José Valim <jose....@gmail.com>, a écrit :
>
> 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 Valim*
> https://dashbit.co/
>
>
> On Fri, Nov 15, 2024 at 11:13 AM Christian Blavier <cbla...@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....@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 <cbla...@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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