Created
December 13, 2018 03:49
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A implementation of the Either 'rights' and 'lefts' functions
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| import Data.Either (Either(..), either, hush) | |
| import Data.Array (mapMaybe) | |
| import Data.Maybe (Maybe(..)) | |
| rights :: forall a b. Array (Either a b) -> Array b | |
| rights array = mapMaybe hush array | |
| -- Also the Lefts implementation | |
| lefts :: forall a b. Array (Either a b) -> Array a | |
| lefts array = mapMaybe (either Just (const Nothing)) array |
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Article discussing a bit more.
https://medium.com/@gregberns/purescript-performance-with-foldl-to-get-rights-845118bf87e5