On Wed, Oct 3, 2012 at 5:09 PM, Brendan Eich <bren...@mozilla.org> wrote:
> Domenic Denicola wrote: > >> Would it suffice to allow cross-frame sharing of symbols via postMessage >> and its structured clone algorithm? They're immutable, right? >> > > They are immutable but you'd still have to pass your @iterator to another > same-origin frame, and then have to use it carefully when iterating objects > from the first frame. This is unusable. > > Making @iterator a singleton (to the limits of observability: same-origin, > CORS, out-of-process-via-DOM window.open in IE9+ notwithstanding!) can be > done. That wins, no need to pass and use the other frame's @iterator symbol. > > But how to let users create such singletons? > > The module system does this for us, doesn't it? I can't really see the problem -- anywhere you can share objects with private symbols you can always provide the symbols themselves. Module sandboxes will come in handy.
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