JavaScript is planned to support operator overloading with value types in ES7. We're following those discussions very closely and intend to support it as soon as it possible with a macro-transpilation solution interim.

We're going to port some stuff directly from numpy and scipy (directly from source with the required legal attribution).

I understand this is a huge undertaking but we're standing on the shoulders of giants and we are optimistic about those deadlines. Of course if it'll take longer it'll take longer we're still building it - any help would be really appreciated of course.