How to AND all booleans in a list using lambdas?

Question

I have a list of objects from which I extract the booleans and want to apply the AND operation on them. Is there a better (or more concise) way to do this?

final boolean[] result = {true};
someList.stream().map(o -> o.getBooleanMember()).forEach(b -> result = result && b);

Answer 1

You can use reduce :

boolean result = someList.stream().map(o -> o.getBooleanMember()).reduce(true,(a,b)->a&&b);