So in terms of implementation, may be having instance method/property references on the objects and having static method/property references on the prototype is the solution?
On Tue, Mar 12, 2019 at 8:14 AM Isiah Meadows <[email protected]> wrote: > I've done a little engine work, and inline caches work by inline type maps > based on the callee site. This *can* be used to reconstruct values + > receivers, but only when the value is constant. It is not sufficient to > ensure identity remains the same, and engines would still need a weak map > to link methods to instances (as opposed to prototypes). > > It's worth noting not even Java or Ruby offers this - their method > references/objects (like our bound functions) are *not* memoized - they're > linked to classes, not instances. Python is the exception here in > auto-binding instance methods, not the norm. > On Mon, Mar 11, 2019 at 15:37 Bergi <[email protected]> wrote: > >> Hi John! >> > I think the js run-time already has that information at hand, so as >> > long as we don't implement this as pure syntactical sugar, there would >> > not be a need to keep an extra reference to anything, because it would >> > be already there. The run-time will know which instance the invoked >> > method belongs to. >> >> Well no, you're wrong here: the runtime does not have this information >> at hand. In your example (simplified) >> ``` >> var reqManager = new RequestManager(); >> function addEventListener(f) { >> console.log(f); >> f(event); >> } >> addEventListener(reqManager.responseHandler); >> ``` >> the `addEventListener` function will not know that the function `f` you >> passed was a method of the `reqManager` instance. It cannot distinguish >> that call from >> ``` >> addEventListener(RequestManager.prototype.responseHandler); >> ``` >> or >> ``` >> var g = otherReqManager.responseHandler; >> addEventListener(g); >> ``` >> >> It is exactly the same function that is passed in all three cases. There >> is no instance bound to `f`, and `f(event)` will not invoke it as a >> method (with a receiver/`this` value). >> >> Best regards, >> Bergi >> _______________________________________________ >> es-discuss mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/es-discuss >> > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
_______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
