> I think it's irrelevant if internally VMs are not too happy. VMs are there to solve our problems, not vice-versa ;-) This ^ is very important for everyone to get on board with. Regardless the cost should be negligible as the shape is only changing at the point of delayed init. This will cause, for example V8, to deop the object and have to build a new hidden class but only the one time. I guess it would potentially be interesting to support an own property that when undefined would delegate up the proto chain.
- Matthew Robb On Mon, Sep 11, 2017 at 7:09 AM, Andrea Giammarchi < [email protected]> wrote: > Hi Peter. > > Unless you have a faster way to do lazy property assignment, I think it's > irrelevant if internally VMs are not too happy. VMs are there to solve our > problems, not vice-versa ;-) > > Regards > > > > On Mon, Sep 11, 2017 at 11:54 AM, peter miller <[email protected]> > wrote: > >> Hi Andrea, >> >> ``` >>> class CaseLazy { >>> get bar() { >>> var value = Math.random(); >>> Object.defineProperty(this, 'bar', {value}); >>> return value; >>> } >>> } >>> ``` >>> >> >> Doesn't this count as redefining the shape of the object? Or are the >> compilers fine with it? >> >> Peter >> -- >> "There were drawings, and sheets of paper with writing on them, and it >> seemed that they were the sustenance of life, that here were the warlocks, >> almost the vehicles of destruction of man's life, but at the same time the >> very reason for his living." --- Maeve Gilmore/Titus Awakes. >> > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
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