To be specific, the `_by` part of these imply they would take a function to
me as well, which I'm assuming for all these cases to just be the identity
function for keeping the example simple.
On a side note, I would really like a more proper `group_by` function that
is RLE based, though unsure what to call it since `group_by` is already
taken?
On Thursday, October 17, 2019 at 5:01:26 PM UTC-6, OvermindDL1 wrote:
>
> Like given a list like:
> ```
> [1, 1, 1, 2, 2, 2, 2, 3, 3, 1, 1, 4, 4]
> ```
> I'd expect it to return:
> ```
> [{1, 3}, {2, 4}, {3, 2}, {1, 2}, {4, 2}]
> ```
>
> This is similar to similar named functions in some other languages I use
> though, so I am bias'ed that way
>
> (Technically `group_by` is misnamed in Elixir as well for what I'm
> generally used to, I'm used to such a function being called `group_map` to
> do the same thing, where `group_by` does RLE style grouping as well, where
> `[1, 1, 1, 2, 2, 2, 2, 3, 3, 1, 1, 4, 4]` would actually return `[[1, 1,
> 1], [2, 2, 2, 2], [3, 3], [1, 1], [4, 4]]`. Elixir is a bit of an oddity
> with a lot of naming conventions compared to what I'm used to.)
>
> On Thursday, October 17, 2019 at 4:44:50 PM UTC-6, José Valim wrote:
>>
>> Can you please expand what would be a RLE style count?
>>
>> On Fri, Oct 18, 2019 at 00:43 OvermindDL1 <[email protected]> wrote:
>>
>>> I personally think the `count_by` name implies some other operation then
>>> a grouped count (to me I'd expect an RLE style count), I like the prior
>>> mentioned `group_count_by` or `group_count`.
>>>
>>> On Thursday, October 17, 2019 at 2:07:56 PM UTC-6, José Valim wrote:
>>>>
>>>> Hi Osawa,
>>>>
>>>> Please send a pull request for Enum.count_by:
>>>>
>>>> iex> Enum.count_by(~w{aa aA bb cc}, fn x -> String.downcase(x) end)
>>>> %{"aa" => 2, "bb" => 1, "cc" => 1}
>>>>
>>>> It is meant to mirror group_by.
>>>>
>>>> If someone has an objection against count_by, please let us know.
>>>>
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>>> .
>>>
>> --
>>
>>
>> *José Valim*
>> www.plataformatec.com.br
>> Skype: jv.ptec
>> Founder and Director of R&D
>>
>
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