[WORK] groupBy is in! Next: aggregate

[Ary Borenszweig via Digitalmars-d]

On 1/26/15 2:34 PM, Andrei Alexandrescu wrote:
> On 1/26/15 8:11 AM, H. S. Teoh via Digitalmars-d wrote:
>> On Mon, Jan 26, 2015 at 11:26:04AM +0000, bearophile via Digitalmars-d
>> wrote:
>>> Russel Winder:
>>>
>>>> but is it's name "group by" as understood by the rest of the world?
>>>
>>> Nope...
>> [...]
>>
>> I proposed to rename it but it got shot down. *shrug*
>>
>> We still have a short window of time to sort this out, before 2.067 is
>> released...
>
> My suggestion was to keep the name but change the code of your groupBy
> implementation to return tuple(key, lazyValues) instead of just
> lazyValues. That needs to happen only for binary predicates; unary
> predicates will all have alternating true/false keys.
>
> Seems that would please everyone.
>
>
> Andrei
>

That's much more harder to implement than what it does right now. I 
don't know how you'll manage to do the lazyValues thing: you'd need to 
make multiple passes in the range.

Again, other languages return an associative array in this case.