#1695: library submission: Data.Either.unzipEithers :: [Either a b] -> ([a],[b])
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Reporter: JeremyShaw | Owner:
Type: proposal | Status: reopened
Priority: normal | Milestone:
Component: libraries/base | Version: 6.8
Severity: minor | Resolution:
Keywords: | Difficulty: Easy (1 hr)
Os: Unknown | Testcase:
Architecture: Unknown |
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Old description:
> 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:
>
> http://www.google.com/codesearch?hl=en&lr=&q=%22%5BEither+a+b%5D+-%3E+%28%5Ba%5D%2C%5Bb%5D%29%22&btnG=Search
>
> 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.
New description:
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:
http://www.google.com/codesearch?hl=en&lr=&q=%22%5BEither+a+b%5D+-%3E+%28%5Ba%5D%2C%5Bb%5D%29%22&btnG=Search
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.
Deadline: October 15
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1695>
GHC <http://www.haskell.org/ghc/>
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