On Jun 16, 2011, at 10:12 PM, Mark S. Miller wrote: > On Thu, Jun 16, 2011 at 9:29 PM, Cameron McCormack <[email protected]> wrote: > Brendan Eich: > > Read-only and fixed length array subclassing should not require using > > a proxy to implement the subclass. > > I forgot a requirement: that the array be dense, too. > > > The value changing at any time should be ok as long as length is > > writable. Non-writable length value should not change (assuming > > non-configurable -- if configurable then reconfiguring to writable > > would allow new values to be put). > > How about an array whose values might change, and whose length might > change, but which must not be allowed to be changed by user script: a > read only but not fixed length array host object? > > This is essentially the same behaviour as a NodeList, without the > additional methods on it. So the value of the length property must be > able to be changed by the implementation. Same for the individual array > element properties. I don’t think we can get this with regular data > properties on a native Array object (or a subclass of one).
Yes, NodeList requires Proxy. > I agree. Sounds like a proxy. Glad we worked out the configurability issues. Assuming Tom's fixed properties proposal (the latest) is approvied -- right? /be
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