Re: [Haskell-cafe] another Newbie performance question

On Sat, 17 May 2008, Luke Palmer wrote:

insertLine line csv = let (l,r) = splitLast csv in l ++ [readCSVLine line] ++ r where splitLast [x] = ([],[x]) splitLast (x:xs) = let (l,r) = splitLast xs in (x:l,r)

(Note that I got rid of the "pos" parameter)

I'd like to have a function like Data.List.viewR :: [a] -> Maybe ([a], a) analogously to Data.Sequence, which is a safe replacement for 'init' and 'last'.