On Jan 23, 2012, at 4:58 PM, Russell Leggett <[email protected]> wrote:
> On Mon, Jan 23, 2012 at 5:37 AM, Herby Vojčík <[email protected]> wrote: > Allen Wirfs-Brock wrote: > The following is just speculation...One possible such bottleneck > might be whole object allocation. A JS clone function probably would > have to allocate an empty object and then dynamically populate it by > adding properties one at a time. A native implementation is more > like to have the ability to examine a complete object and create, in > a single primitive operation, a new object with all of the same > properties as the original object. In other words, a native > implementation of deep clone is likely to use some sort of shallow > clone operation is that not available to pure JS code. This suggest > that a better way to get faster deep cloning functions is to make a > native shallow clone function available to JS code. > > +1, nice. > Well, to see if this is the bottleneck, one needs to benchmark, first. > > But I feel the need for shallow clone in the language. Such API should be > there, and if needed, with native implementation as well. > > > As part of the HTML5 specification, there is the structured clone algorithm Which is also incapable of copying a function. > whose primary use case is web workers. It has already been implemented in > Chrome and Firefox, I believe. Not sure if that might be a good place to > start in possibly exposing that as part of JavaScript. > > If I were to make a feature request here, instead of a clone that might not > be terribly useful, I would love to see some better support for Clojure style > persistent data structures. > > I know that's a bit of a long shot, but for all the uses of deep cloning I > can think of, I feel like persistent data structures are much nicer, and > harder to implement in JS. > > - Russ > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss
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