Le 14/01/2012 01:57, Tab Atkins Jr. a écrit : > In the direct proxies proposal at > <http://wiki.ecmascript.org/doku.php?id=harmony:direct_proxies>, > there's the following line: > > get: > * Invariant checks: > * if property exists on target as a data property, updates the > target’s property with the returned value There is also the following line in introduction: "A proxy ensures that its handler and its target do not contradict each other as far as non-configurability and non-extensibility are concerned."
> Consider an xrange object like from Python, which represents a numeric > range (with a start, stop, and step) and exposes both an iterator and > get traps. > > Am I correct in assuming that, since the target of an xrange proxy is > an empty object, iterating through the xrange or getting specific > values from it will *not* fill up the target in an attempt to > synchronize it with the returned values from the get trap? My understanding is that as long as the iteration and property gets don't create or report non-writable and non-configurable properties, nothing will be done to the target. It seems that the case you describe would be a good candidate for "virtual objects" [1] David [1] http://wiki.ecmascript.org/doku.php?id=harmony:virtual_object_api _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
