Comment by dnautics

After spending years in functional-land, I find the for loop (and while loop) construct maddening; you have to maintain the state of the entire enclosing scope system in your head, whereas enumerable constructs like map and reduce close (ideally read only) over variables in scope and if you need to keep state you have to use reduce, which explicitly tracks what changes between iterations and nothing "unexpected"... In a general sense, FP enumerations are more explicit than control loops which are implicit state machines.