Map: filter/map and more

[Andy Wingo]

On Thu 20 Nov 2014 01:49, Dmitry Soshnikov <dmitry.soshnikov at gmail.com> writes:

> At the meeting it was decided not to go with `map` and `filter` sitting
> on `Map.prototype`, but instead to use iterators in the way like:
>
> ```
> map
> .entries() // returns an iterator
> .map((v, k, m) => { ... })
> .filter((v, k, m) => { ... })
> .collect(); // returns a new map after all transforms
> ```

Is there a nice way to do this for the default iterator?  This is pretty
terrible:

  [1,2,3][Symbol.iterator]().map(x=>x+1)

Also, I thought that map, filter, and such were to be on the
Iterator.prototype.  That precludes multi-arg map functions, doesn't it?

Andy