#974: Add unzipEithers, lefts, rights to Data.Either
----------------------------+-----------------------------------------------
Reporter: guest | Owner:
Type: proposal | Status: reopened
Priority: normal | Milestone: Not GHC
Component: libraries/base | Version: 6.6
Severity: normal | Resolution:
Keywords: | Difficulty: Easy (1 hr)
Testcase: | Architecture: Unknown
Os: Unknown |
----------------------------+-----------------------------------------------
Comment (by igloo):
Sorry Russell, I must have forgotten about the thread by the time I closed
the bug.
Having reread the thread, I think we are here:
We are agreed that we should add
{{{
lefts :: [Either a b] -> [a]
rights :: [Either a b] -> [b]
}}}
and that we should add a function with type
{{{
[Either a b] -> ([a],[b])
}}}
Possible names include
{{{
splitEithers
unzipEithers
partitionEithers
catEithers
leftRights
leftsAndRights
boths
demuxEithers
}}}
While choosing a name, we should bear in mind that we might want to define
a function with type
{{{
(a -> Either b c) -> [a] -> ([b],[c])
}}}
at some point in the future.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/974#comment:9>
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