On Sep 7, 2011, at 6:12 AM, Tom Van Cutsem wrote: > 2011/9/7 David Bruant <[email protected]> > Le 06/09/2011 17:59, Mark S. Miller a écrit : > > I agree that the spec should clearly state that a non-extensible object has a > finite collection of own properties. Regarding infinite extensible objects, > the only problem I see off the top of my head is: What would > Object.getOwnPropertyNames return? > And what about for-in loops? :-p > > It's always possible to break/return early, no? Didn't iterators/generators > already cross this bridge? An iterator could iterate over an infinite stream > of values.
Indeed the derived iterate trap supports infinite objects -- this was a use-case Waldemar raised this at TC39 meetings last year, IIRC at the November 2010 meeting (notes posted to es-discuss). See also http://wiki.ecmascript.org/doku.php?id=harmony:iterators#iteration_via_standard_private_name http://wiki.ecmascript.org/doku.php?id=harmony:iterators#iteration_via_proxies /be
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