(Mapping Then Reducing An IntStream for Parallelization) The lambda you pass to a stream&#...

(Mapping Then Reducing An IntStream for Parallelization) The lambda you pass to a stream's reduce method should be associative—that is, regardless of the order in which its subexpressions are evaluated, the result should be the same. The lambda expression in lines 34—36 of Fig. 3 is not associative. If you were to use parallel streams (Chapter 23, Concurrency) with that lambda, you might get incorrect results for the sum of the squares, depending on the order in which the subexpressions are evaluated. The proper way to implement lines 34—36 would be first to map each int value to the square of that value, then to reduce the stream to the sum of the squares. Modify 3 to implement lines 34—36 in this manner.

Fig.| Demonstrating IntStream operations.