filter'
1234567
filter' :: (a -> Bool) -> [a] -> [a]
filter' _ [] = []
filter' predicate (x:xs) = if predicate x
then x:(filter' predicate xs)
else filter' predicate xs
main = print $ filter' (<5) [3, 6, 8, 1, 3, 8, 6]
Haskell
INFO