| Safe Haskell | Safe |
|---|---|
| Language | Haskell2010 |
Data.Map.Misc
Contents
Description
Additional functions for manipulating Maps.
Synopsis
- diffMapNoEq :: Ord k => Map k v -> Map k v -> Map k (Maybe v)
- diffMap :: (Ord k, Eq v) => Map k v -> Map k v -> Map k (Maybe v)
- applyMap :: Ord k => Map k (Maybe v) -> Map k v -> Map k v
- mapPartitionEithers :: Map k (Either a b) -> (Map k a, Map k b)
- applyMapKeysSet :: Ord k => Map k (Maybe v) -> Set k -> Set k
Working with Maps
diffMapNoEq :: Ord k => Map k v -> Map k v -> Map k (Maybe v) Source #
Produce a Map k (Maybe v)Map k vold and new respectively. Just represents an association present in new and Nothing
represents an association only present in old but no longer present in new.
Similar to diffMap but doesn't require Eq on the values, thus can't tell if a value has changed or not.
diffMap :: (Ord k, Eq v) => Map k v -> Map k v -> Map k (Maybe v) Source #
Produce a Map k (Maybe v)Map k vold and new respectively. Just represents an association present in new and either not
present in old or where the value has changed. Nothing represents an association only present in old but no longer present in new@.
See also diffMapNoEq for a similar but weaker version which does not require Eq on the values but thus can't indicated a value not changing between
old and new with Nothing.
applyMap :: Ord k => Map k (Maybe v) -> Map k v -> Map k v Source #
Given a Map k (Maybe v)Just) or delete (Nothing), produce a new map from the given input Map k v
See also Map and MapWithMove.