[Haskell-beginners] Calculations that might fail: with arrays

I was wondering if there was a stock function or package in Haskell that allows you to map over a list, but short-circuits the mapping if any of the calculations fail. Say, something like this: -- Don't know if this is a valid signature! :) mapThatCanFail :: (b -> Either a b) -> [b] -> Either a [b] The idea being that, if any calculations fail, the function doesn't bother mapping the rest of the list, but just returns a Left value (error). Otherwise, it returns a Right value containing the new list. I suppose I could try to implement that myself, but it seems like the sort of thing that someone would have thought of already. -- frigidcode.com theologia.indicium.us