findWithDefault package:containers

findWithDefault :: a -> Key -> IntMap a -> a
containers Data.IntMap.Internal Data.IntMap.Lazy Data.IntMap.Strict Data.IntMap.Strict.Internal
The expression (findWithDefault def k map) returns the value at key k or returns def when the key is not an element of the map. 
findWithDefault 'x' 1 (fromList [(5,'a'), (3,'b')]) == 'x'
findWithDefault 'x' 5 (fromList [(5,'a'), (3,'b')]) == 'a'
findWithDefault :: Ord k => a -> k -> Map k a -> a
containers Data.Map.Internal Data.Map.Lazy Data.Map.Strict Data.Map.Strict.Internal
The expression (findWithDefault def k map) returns the value at key k or returns default value def when the key is not in the map. 
findWithDefault 'x' 1 (fromList [(5,'a'), (3,'b')]) == 'x'
findWithDefault 'x' 5 (fromList [(5,'a'), (3,'b')]) == 'a'