Jason Orendorff wrote:
On Wed, Oct 3, 2012 at 11:34 AM, Brendan Eich<[email protected]> wrote:
* the spread syntax just uses the iteration protocol;
This differs from Array.from -- any reason not to fall back on the
array-like protocol (which for missing 'length' iterates no values)?
I think ES6 should have a single how-to-iterate behavior shared by
Array.from, spread syntax, and for-of.
Whether that includes a fallback to .length or not seems less important to me.
It seems simpler *not* to include the fallback. Firefox doesn't
include it at present. Instead, arraylike objects are pretty much all
iterable. That wasn't hard to do, since our Array.prototype.iterator
is generic.
I buy it.
Not sure why we didn't do it in the July meeting where we settled on
Array.from testing iterable and falling back on array-like. Perhaps fear
that @iterator customizations will be missing from a number of array-likes.
On that point, does NodeList have an iterator in Firefox now? That's an
obvious Array.from argument type.
/be
_______________________________________________
es-discuss mailing list
[email protected]
https://mail.mozilla.org/listinfo/es-discuss
