This could probably be solved if Javascript had map/filter/reduce functions for iterators (and hopefully dictionaries) as well as arrays. And of course a range

This could probably be solved if Javascript had map/filter/reduce functions for iterators (and hopefully dictionaries) as well as arrays. And of course a range(start,stop,step) iterator similar to python's range. it would then be a matter of: next = range(1,40000).map(x => x * 2); and because range would be an iterator, the only array created would be next.