diff options
Diffstat (limited to 'libraries/base/Data/Tuple.hs')
| -rw-r--r-- | libraries/base/Data/Tuple.hs | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/libraries/base/Data/Tuple.hs b/libraries/base/Data/Tuple.hs index 372e2b8a86..569dd14da0 100644 --- a/libraries/base/Data/Tuple.hs +++ b/libraries/base/Data/Tuple.hs @@ -6,7 +6,7 @@ -- Module : Data.Tuple -- Copyright : (c) The University of Glasgow 2001 -- License : BSD-style (see the file libraries/base/LICENSE) --- +-- -- Maintainer : libraries@haskell.org -- Stability : experimental -- Portability : portable @@ -39,13 +39,32 @@ snd :: (a,b) -> b snd (_,y) = y -- | 'curry' converts an uncurried function to a curried function. +-- +-- ==== __Examples__ +-- +-- >>> curry fst 1 2 +-- 1 curry :: ((a, b) -> c) -> a -> b -> c curry f x y = f (x, y) -- | 'uncurry' converts a curried function to a function on pairs. +-- +-- ==== __Examples__ +-- +-- >>> uncurry (+) (1,2) +-- 3 +-- +-- >>> uncurry ($) (show, 1) +-- "1" +-- +-- >>> map (uncurry max) [(1,2), (3,4), (6,8)] +-- [2,4,8] uncurry :: (a -> b -> c) -> ((a, b) -> c) uncurry f p = f (fst p) (snd p) -- | Swap the components of a pair. swap :: (a,b) -> (b,a) swap (a,b) = (b,a) + +-- $setup +-- >>> import Prelude hiding (curry, uncurry, fst, snd) |