utility-ht-0.0.9: Various small helper functions for Lists, Maybes, Tuples, Functions

Data.Tuple.HT

Contents

Synopsis

• mapPair :: (a -> c, b -> d) -> (a, b) -> (c, d)
• mapFst :: (a -> c) -> (a, b) -> (c, b)
• mapSnd :: (b -> c) -> (a, b) -> (a, c)
• swap :: (a, b) -> (b, a)
• forcePair :: (a, b) -> (a, b)
• fst3 :: (a, b, c) -> a
• snd3 :: (a, b, c) -> b
• thd3 :: (a, b, c) -> c
• mapTriple :: (a -> d, b -> e, c -> f) -> (a, b, c) -> (d, e, f)
• mapFst3 :: (a -> d) -> (a, b, c) -> (d, b, c)
• mapSnd3 :: (b -> d) -> (a, b, c) -> (a, d, c)
• mapThd3 :: (c -> d) -> (a, b, c) -> (a, b, d)
• curry3 :: ((a, b, c) -> d) -> a -> b -> c -> d
• uncurry3 :: (a -> b -> c -> d) -> (a, b, c) -> d

# Pair

mapPair :: (a -> c, b -> d) -> (a, b) -> (c, d)Source

Cf. '(Control.Arrow.***)'.

Apply two functions on corresponding values in a pair, where the pattern match on the pair constructor is lazy. This is crucial in recursions such as the of `partition`.

mapFst :: (a -> c) -> (a, b) -> (c, b)Source

`first`

mapSnd :: (b -> c) -> (a, b) -> (a, c)Source

`second`

swap :: (a, b) -> (b, a)Source

forcePair :: (a, b) -> (a, b)Source

# Triple

fst3 :: (a, b, c) -> aSource

snd3 :: (a, b, c) -> bSource

thd3 :: (a, b, c) -> cSource

mapTriple :: (a -> d, b -> e, c -> f) -> (a, b, c) -> (d, e, f)Source

mapFst3 :: (a -> d) -> (a, b, c) -> (d, b, c)Source

mapSnd3 :: (b -> d) -> (a, b, c) -> (a, d, c)Source

mapThd3 :: (c -> d) -> (a, b, c) -> (a, b, d)Source

curry3 :: ((a, b, c) -> d) -> a -> b -> c -> dSource

uncurry3 :: (a -> b -> c -> d) -> (a, b, c) -> dSource