On Fri, Nov 15, 2013 at 11:24 AM, Jason Orendorff <jason.orendorff@gmail.com > wrote: > On Fri, Nov 15, 2013 at 10:08 AM, Boris Zbarsky <bzbarsky@mit.edu> wrote: > > An obvious question that arises is what the definition of iterable is. > > > > Is it something for which HasProperty(obj, @@iterator) returns true? > > > > Is it something for which GetProperty(obj, @@iterator) returns something > > other than undefined? > > > > Is it something for which GetProperty(obj, @@iterator) returns a callable > > object? > > Array.from[1] has to make this determination, such that it can't "just > iterate and see". At the moment it is spec'd to use HasProperty(obj, > @@iterator). But that is inconsistent; other places where we check for > a method always use the third criterion. I hope Allen can weigh in. > I was mid-typing when came through... HasProperty(obj, @@iterator) should be sufficient since the well known @@iterator symbol can only be that symbol. Rick
Received on Friday, 15 November 2013 16:30:03 UTC