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Add uncurry' #28

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10 changes: 10 additions & 0 deletions src/Streaming/Prelude.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -223,6 +223,7 @@ module Streaming.Prelude (
, fst'
, snd'
, mapOf
, uncurry'
, _first
, _second

Expand Down Expand Up @@ -365,6 +366,15 @@ mapOf :: (a -> b) -> Of a r -> Of b r
mapOf f (a:> b) = (f a :> b)
{-#INLINE mapOf #-}

{-| The analogue of 'uncurry' to apply a function to both elements of a left-strict pair.

This can be especially useful combined with functions like 'mapped'.

-}
uncurry' :: (a -> b -> c) -> Of a b -> c
uncurry' f (a :> b) = f a b
{-# INLINE uncurry' #-}

{-| A lens into the first element of a left-strict pair -}
_first :: Functor f => (a -> f a') -> Of a b -> f (Of a' b)
_first afb (a:>b) = fmap (\c -> (c:>b)) (afb a)
Expand Down