Anton Kovalyov wrote:
See here: http://wiki.ecmascript.org/doku.php?id=harmony:destructuring
and
https://developer.mozilla.org/en-US/docs/JavaScript/New_in_JavaScript/1.7#Destructuring_assignment_%28Merge_into_own_page.2Fsection%29
Right -- here are inline examples:
function pair(x, y) { return [x, h]; }
let [x, y] = pair(3,4);
This can be done without allocation with an optimization from Scheme
implementations, where the JIT looks into the continuation and sees the
destructuring of a fresh array result, and avoids creating a temporary
array just to pull it apart.
Anton
On 3 January 2013 07:26, anders elo <[email protected]
<mailto:[email protected]>> wrote:
I'd like to propose the incorporation of multiple return values
into the ES standard.
function foo(){
return 1,2,3;
Note that this is not backward compatible because JS inherited the comma
operator from C (unlike Java -- recessive gene skipped a generation :-P).
/be
}
let (a,b,c) = foo();
let (a,b) = foo(); // ignore c
let (a,...b) = foo() // a = 1, b = [2,3]
/* also useful for asynchronous functions returning a promise */
let (response,headers) = yield
getAjaxData("http://some.host.com/data";);
Thanks! ;)
Vänliga hälsningar / Best regards
Anders Elo @ kaerus.com <http://kaerus.com>
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