library submission: Data.Either.unzipEithers :: [Either a b] -> ([a], [b])

Jeremy Shaw at
Fri Sep 14 16:17:38 EDT 2007

Oops, just realized this is a dup:

But, perhaps we can make some progress ?

At Fri, 14 Sep 2007 13:12:41 -0700,
Jeremy Shaw wrote:
> This function is like unzip for a list of Eithers instead of tuples.
> According to google code search, I am at least the 5th person to
> implement this function:
> I opted for the name unzipEithers because the function is similar to
> two existing functions: unzip and catMaybes. It seems less similar to
> partition, because partition does not desconstruct the values, it just
> divides them into to two groups. I have no particular attachment to
> the name however.
> I modeled the implementation after unzip and partition. Hopefully I
> made effective use of the irrefutable patterns and laziness, but
> someone else should verify.
> j.
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