34 lines
1.1 KiB
Haskell
34 lines
1.1 KiB
Haskell
{- This file is part of Vervis.
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-
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- Written in 2016, 2019 by fr33domlover <fr33domlover@riseup.net>.
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-
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- ♡ Copying is an act of love. Please copy, reuse and share.
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-
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- The author(s) have dedicated all copyright and related and neighboring
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- rights to this software to the public domain worldwide. This software is
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- distributed without any warranty.
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-
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- You should have received a copy of the CC0 Public Domain Dedication along
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- with this software. If not, see
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- <http://creativecommons.org/publicdomain/zero/1.0/>.
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-}
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module Data.Maybe.Local
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( partitionMaybes
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, partitionMaybePairs
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)
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where
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partitionMaybes :: [(Maybe a, b)] -> ([(a, b)], [b])
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partitionMaybes = foldr f ([], [])
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where
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f (Nothing, y) (ps, ys) = (ps , y : ys)
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f (Just x , y) (ps, ys) = ((x, y) : ps, ys)
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partitionMaybePairs :: [(Maybe a, Maybe b)] -> ([a], [b], [(a, b)])
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partitionMaybePairs = foldr f ([], [], [])
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where
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f (Nothing, Nothing) ls = ls
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f (Just x, Nothing) (xs, ys, ps) = (x : xs, ys, ps)
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f (Nothing, Just y) (xs, ys, ps) = (xs, y : ys, ps)
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f (Just x, Just y) (xs, ys, ps) = (xs, ys, (x, y) : ps)
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