Re: Proposal: add unzips for Data.Sequence

I did not know about MonadZip and wouldn't have thought to look for it. On the other hand, unzip and unzipWith are immediately intuitive. I think they'd be a solid addition. On Thu, Jan 11, 2018 at 8:54 PM, David Feuer wrote:

We don't strictly *need* to add either of these functions. Users can use munzip from the MonadZip instance, and we can add a rewrite rule to turn

munzip (fmap f xs)

into

Data.Sequence.Internal.unzipWith f xs

On the other hand, MonadZip isn't a terribly well-known class, and unzipWith has always struck me as an obvious analogue of zipWith.

On Jan 11, 2018 10:32 PM, "Ivan Lazar Miljenovic" < ivan.miljenovic@gmail.com> wrote:

...

On 12 January 2018 at 13:28, David Feuer wrote:

...

Paolo G. Giarrusso (Blaisorblade) would like to add an unzip function to Data.Sequence. I agree. I propose adding

unzip :: Seq (a,b) -> (Seq a, Seq b)

unzipWith :: (x -> (a, b)) -> Seq x -> (Seq a, Seq b)

Does anyone object?

I see no problem with this. Though I think it's worth pointing out that Data.List doesn't have unzipWith (though unzipWith f = unzip . map f).

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com

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