base-compat-0.12.1: A compatibility layer for base
Safe HaskellSafe
LanguageHaskell2010

Data.Tuple.Compat

Synopsis
  • fst :: (a, b) -> a
  • snd :: (a, b) -> b
  • curry :: ((a, b) -> c) -> a -> b -> c
  • uncurry :: (a -> b -> c) -> (a, b) -> c
  • swap :: (a, b) -> (b, a)

Documentation

fst :: (a, b) -> a #

Extract the first component of a pair.

snd :: (a, b) -> b #

Extract the second component of a pair.

curry :: ((a, b) -> c) -> a -> b -> c #

curry converts an uncurried function to a curried function.

Examples

Expand
>>> curry fst 1 2
1

uncurry :: (a -> b -> c) -> (a, b) -> c #

uncurry converts a curried function to a function on pairs.

Examples

Expand
>>> uncurry (+) (1,2)
3
>>> uncurry ($) (show, 1)
"1"
>>> map (uncurry max) [(1,2), (3,4), (6,8)]
[2,4,8]

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

Swap the components of a pair.