On Mon, Mar 2, 2015 at 9:30 AM, John Lenz <[email protected]> wrote:
> 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 */
> ...
> };
>
More controversially, we might consider
if (function.called_from_void_result_context) {
/* proposed .done behavior */
I'm not sure what I think of this. It is kinda scary, but it might be the
right thing.
>
>
> // 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
>>
>>
>
> _______________________________________________
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>
>
--
Text by me above is hereby placed in the public domain
Cheers,
--MarkM
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