David Bruant wrote:
Le 20/04/2013 15:17, Brendan Eich a écrit :
Tab Atkins Jr. wrote:
It would be so nice if JS had multiple return values, so we could let
cancellable future-returning APIs just return a naked resolver as
their second value,
Hello, destructuring:
let{ proxy, revoke} = Proxy.revocable(target, handler);
from
http://wiki.ecmascript.org/doku.php?id=strawman:revokable_proxies. Or
use an array pattern if you prefer.
JIT'ing VMs can optimize these pretty easily to avoid object allocation.
I find pretty interesting cases where high-level expressive syntax
results in optimizations that were impossible to very hard without the
syntax.
Is it already implemented in SpiderMonkey? If not, is there a bug
number to follow the progress?
Implemented long ago:
js> function cons(h, t) { return {head: h, tail: t}; }
js> let {head, tail} = cons("hi", "bye")
js> head
"hi"
js> tail
"bye"
(Not optimized yet, AFAIK. Care to file that bug? Cc: me if you do. Thanks!)
/be
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