filter -package:Cabal -package:conduit package:ghc

Filter all values that satisfy some predicate.

filter (> "a") (fromList [(5,"a"), (3,"b")]) == singleton 3 "b"
filter (> "x") (fromList [(5,"a"), (3,"b")]) == empty
filter (< "a") (fromList [(5,"a"), (3,"b")]) == empty

Filter all elements that satisfy some predicate.

Replaces constraint tuple names with corresponding boxed ones.

Filter the CFG with a custom function f. Parameters are `f from to edgeInfo`

Filter all elements that might match a particular key with the given predicate.

Given a TyCon and a list of argument types, filter out any Inferred arguments.

Given a TyCon and a list of argument types, filter out any invisible (i.e., Inferred or Specified) arguments.

Filter the entries whose keys are missing from the other map using some Applicative action.

filterAMissing f = Merge.Lazy.traverseMaybeMissing $
\k x -> (\b -> guard b *> Just x) <$> f k x

but this should be a little faster.

Filter the entries whose keys are missing from the other map.

filterMissing :: (k -> x -> Bool) -> SimpleWhenMissing x x

filterMissing f = Merge.Lazy.mapMaybeMissing $ \k x -> guard (f k x) *> Just x

but this should be a little faster.

Filter all keys/values that satisfy some predicate.

filterWithKey (\k _ -> k > 4) (fromList [(5,"a"), (3,"b")]) == singleton 5 "a"