Re: [Haskell-beginners] How to select items from one list depending on another

2010/11/10 C K Kashyap :

Hi, I have this problem at hand -

Given two lists

list1 = [0,1,2,0,1,4]

list2 = [1,2,3,4,5,6] I need to take items from the second list only when the corresponding item in list1 is non-zero.

Another wayOne way to do it, although not shorter : list3 = catMaybes $ zipWith (\a b -> if a > 0 then Nothing else Just b) list1 list2 David.