The problem here is not with parseInt but with map. Map is such a basic function and should have been defined more simply. By all means, make an extended mapE

The problem here is not with parseInt but with map. Map is such a basic function and should have been defined more simply. By all means, make an extended mapE function that passes all kinds of things like position in the input iterable, a reference to the iterable, a reference to an at-first empty “memo” object that will be discarded at the end of the map call, etc etc.