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fix alt for ZipList #150

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Merged
merged 2 commits into from
Dec 26, 2020
Merged

fix alt for ZipList #150

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aa1fc67
fix alt for ZipList
xgrommx Jul 31, 2018
eca6ea0
remove redundant $
xgrommx Jul 31, 2018
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7 changes: 4 additions & 3 deletions src/Data/List/ZipList.purs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,15 +6,16 @@ module Data.List.ZipList
) where

import Prelude
import Prim.TypeError (class Fail, Text)

import Control.Alt (class Alt)
import Control.Alternative (class Alternative)
import Control.Plus (class Plus)
import Data.Foldable (class Foldable)
import Data.List.Lazy (List, repeat, zipWith)
import Data.List.Lazy (List, drop, length, repeat, zipWith)
import Data.Newtype (class Newtype)
import Data.Traversable (class Traversable)
import Partial.Unsafe (unsafeCrashWith)
import Prim.TypeError (class Fail, Text)

-- | `ZipList` is a newtype around `List` which provides a zippy
-- | `Applicative` instance.
Expand Down Expand Up @@ -46,7 +47,7 @@ instance applicativeZipList :: Applicative ZipList where
pure = ZipList <<< repeat

instance altZipList :: Alt ZipList where
alt = append
alt (ZipList xs) (ZipList ys) = ZipList $ xs <> drop (length xs) ys

instance plusZipList :: Plus ZipList where
empty = mempty
Expand Down