Java 8 streams adding values from two or more lists
java, java-8
Solution
That one isn't really doable the way you're hoping. The closest you could get would probably be
IntStream.range(0, voterA.size())
.mapToObj(i -> voterA.get(i) + voterB.get(i))
.collect(toList());
...but there's no "zip" operation on streams, largely because two different streams can have backing spliterators that split at different points, so you can't line them up properly.
Problem
I am trying to get into Java 8 and get my head around streams and lambdas to solve various problems and got stuck on this specific one which I normally use a forEach and store the values in a Map to solve. How would you write the code to get the expected list using the new features in Java 8 ? ``` List<Integer> voterA = Arrays.asList(1,2,3,4,5); List<Integer> voterB = Arrays.asList(1,2,3,4,5); List<List<Integer>> votes = Arrays.asList(voterA, voterB); // expected list = (2,4,6,8,10) List<Integer> sumVotes = ... ```