I was recently discussion Promise optimizations (specifically, that in any
"then" chain at least one Promise object is created that goes unused), this
could be solved by some metadata that indicated whether the result of the
function would be consumed:
Promise.prototype.then = function(a, b) {
...
if (function.called_from_void_result_context) {
return undefined;
}
/* current behavior */
...
};
// example
somePromise.then(); // no chaining promise created by then
var x = somePromise.then(); // chaining promise created
x.then(); // no chaining promise created
I'm not really sure what impact this would have on the VMs but I found it
an interesting idea.
On Thu, Feb 26, 2015 at 2:47 PM, Allen Wirfs-Brock <[email protected]>
wrote:
> Here is a new proposal for some additional meta properties that should be
> considered for ES7
> https://github.com/allenwb/ESideas/blob/master/ES7MetaProps.md
>
> I've added this to the agenda for next months TC39 meeting but pre-meeting
> discussion is always welcomed right here.
>
> Allen
>
>
> _______________________________________________
> 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
