This is sort of resonating with me. Maybe I've been doing to many exercises by the book, I dunno, but your description of the problem space seems straight out o

This is sort of resonating with me. Maybe I've been doing to many exercises by the book, I dunno, but your description of the problem space seems straight out of a textbook which I'm all to familar with. Divide and conquer; define the data set, factor, isolate, call foo, iterate. . .expressions, storage space, and iterating each as a function is not hard, in short deducing a problem set in terms of an operation is not hard for me, since an operation, to me at least, is synomous with run-time, which is why I thought I was programming. . .a compositon of operations in terms of input and output. I understand that each approach is borrowing similar tenents of refactoring input, but I don't understand how the composition of operations are playing in terms of code-time vs run-time.