The *.extras vocabularies are places to incubate new words. We haven't done the
best job of documenting them and promoting to the core/basis vocabularies.
> On Nov 18, 2016, at 8:21 AM, Alexander Ilin <ajs...@yandex.ru> wrote:
>
> Hello, Björn!
>
> 18.11.2016, 18:25, "Björn Lindqvist" <bjou...@gmail.com>:
>> USE: sequences.extras
>> [ id>> ] sort-with [ id>> ] group-by [ second first ] map
>
> I could not find `group-by` using the Browser. Grepping the source tree, it
> turned up in `grouping.extras`.
>
>> USE: math.statistics
>> [ id>> ] collect-by [ nip first ] { } assoc>map
>
> `collect-by` is a useful thing, got to keep it in mind. I remember
> implementing something very similar not too long ago.
>
>> It's not as efficient as what John committed though. :) Maybe we
>> should try and clean it up somehow? If we put all group
>> by/aggregation/uniquifying words in the same vocab it would be more
>> easily discoverable?
>
> That may be a good idea. I'm regularly rereading the documentation for
> `sequences` and `sets`, so maybe a little pointer to adjacent vocabs (at
> least *.extras) could be made.
>
> ---=====---
> Александр
>
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