On Jul 11, 2011, at 10:00 PM, Luke Hoban wrote:
> So I was wrong about iterators being the general interoperable runtime
> mechanism, but next/send/throw/close objects appear to be fully iterable and
> consumable in generators. Is that right?
That's right, there is no nominal type test.
> If so, it seems safe to consider generators as sugar for producing objects
> whose visible behavior could have been built independently. And
> interoperation appears to work cleanly in both directions using these objects.
You're talking about interoperation in the "old script calls new generator"
sense. That's using generators from old script, *not* implementing them using
imperative API *in old script*.
The contested principle is Anything that can be done declaratively can also be
done imperatively, using ES5 syntax.
You can't write a yield expression using an imperative API. Yielding is
something "that can be done" (whether declaratively or by expression syntax,
let's not quibble). So the principle overreaches.
As for someone using "legacy" to describe ES5-ish JS (JS of today), don't take
it to heart. JS is JS, the new version is just that. We survived ES1/2 to ES3.
We'll survive the next turn.
/be
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