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Fix negative index handling in splitAt, replicate and unfoldrN. Move mapF, filterF...
[haskell-directory.git]
/
Data
/
Ord.hs
diff --git
a/Data/Ord.hs
b/Data/Ord.hs
index
2be636c
..
490d6be
100644
(file)
--- a/
Data/Ord.hs
+++ b/
Data/Ord.hs
@@
-15,7
+15,7
@@
module Data.Ord (
Ord(..),
module Data.Ord (
Ord(..),
- Ordering,
+ Ordering(..),
comparing,
) where
comparing,
) where
@@
-23,5
+23,12
@@
module Data.Ord (
import GHC.Base
#endif
import GHC.Base
#endif
+-- |
+-- > comparing p x y = compare (p x) (p y)
+--
+-- Useful combinator for use in conjunction with the @xxxBy@ family
+-- of functions from "Data.List", for example:
+--
+-- > ... sortBy (comparing fst) ...
comparing :: (Ord a) => (b -> a) -> b -> b -> Ordering
comparing p x y = compare (p x) (p y)
comparing :: (Ord a) => (b -> a) -> b -> b -> Ordering
comparing p x y = compare (p x) (p y)