So as you are noticing i have also provided you with both my invention that is my Scalable Adder and with my invention that is my ParallelFor() that scales very well, and both of them will allow you to do or implement easily higher-order functions like Map, Reduce and filter that scale very well, here is my scalable Adder:
You can also read my following thoughts about my invention that is my Threadpool with priorities that scales very well and that implement
a ParallelFor() that scales very well: