Talk:Higher order function
I'm a beginner in Haskell and needs help I need a resourse of haskell from scratch and also need someone to explain in details the quicksort that is published:
quicksort :: Ord a => [a] -> [a] quicksort  =  quicksort (p:xs) = (quicksort lesser) ++ [p] ++ (quicksort greater)
where lesser = filter (< p) xs greater = filter (>= p) xs
without line no 1, it works fine what about line three ? and how we use ++ as concatenate ???
Thanks in advance