Standardizing __proto__

Allen Wirfs-Brock allen at
Fri Mar 18 11:33:54 PDT 2011

I think Oliver's original formulation is more correct, but regardless this really would have to be specified using ES5 pseudo code.

This is along the path of what I was calling a "generalized" solution to the problem and as such I think it needs deeper/longer consideration to be sure we have it right.  I think a single argument Array.create is safer  if we are looking for something that could be immediately implemented in order to start phasing out __proto__.  Having Array.create wouldn't stop also providing a more general solution such as the one below.


On Mar 18, 2011, at 10:56 AM, Mike Shaver wrote:

> On Fri, Mar 18, 2011 at 10:45 AM, Oliver Hunt <oliver at> wrote:
>> I think so -- my proposal doesn't take instances, nor produce instances, it takes the constructor function (Image is one of a handful of DOM constructor that can actually be used to construct things) and returns a new constructor that will produce an instances of the target object with a modified prototype chain.
> Andreas in IM that we hang it on the prototype chain, so that we get
> it everywhere without repetitive specification.  How about:
> Function.prototype.createDelegatingTo = function (obj)
> {
>  var o = new this; // really new-with-apply(arguments) here
>   o.__proto__ = obj;
>   return o;
> }
> Then Array.createDelegatingTo, Boolean.createDelegatingTo, Image, etc.
> should all work.  (I like the longer, grosser name because I think
> it's sort of a gross pattern, and not something that should use up a
> concise name.)
> Mike
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