filter is:exact -package:aeson -package:containers -package:ghc -package:base -package:filepath package:unordered-containers

filter :: (v -> Bool) -> HashMap k v -> HashMap k v
unordered-containers Data.HashMap.Internal Data.HashMap.Internal.Strict Data.HashMap.Lazy Data.HashMap.Strict
Filter this map by retaining only elements which values satisfy a predicate.
filter :: (a -> Bool) -> HashSet a -> HashSet a
unordered-containers Data.HashSet Data.HashSet.Internal
Filter this set by retaining only elements satisfying a predicate.