On Oct 21, 2011, at 11:49 AM, John J Barton wrote:
> On Fri, Oct 21, 2011 at 9:36 AM, Axel Rauschmayer <[email protected]> wrote:
> In a vein similar to making [] available to collections, one could make "new"
> and "instanceof" available to other inheritance schemes.
>
> For example:
>
> // “Meta-class” for prototypes as classes/instantiable prototypes
> function ProtoExemplars() {}
> ProtoExamplar.prototype.{
> operatorNew(...args) {
> let inst = Object.create(this);
> return inst.constructor(...args);
> },
> operatorInstanceof(lhs) {
> return this.isPrototypeOf(lhs);
> }
> };
>
> More entirely unsubstantiated personal opinion based on a few days experience:
>
> Gonzala's https://github.com/Gozala/selfish does this now and with nicer
> syntax.
That is nice, but it seems to me Axel was aiming to make the new and instanceof
operators useful. If you don't care about those operators, Irakli's library is
great.
> One subtle point I missed about his approach: instance (member) variables are
> created in initializers, not as literals, unless you intend to make the
> variable part of a prototype. This could be stumbling block for Java
> converts, who expect declarative members.
Java-heads may expect new and instanceof too, for that matter.
> y bump so far: XMLHttpRequest.apply fails and you can't run
> XMLHttpRequest.prototype.addEventListener unless you run XMLHttpRequest() on
> the object. So I could not figure out how to inherit from XMLHttpRequest.
This seems like an XHR bug. Mail public-script-coord?
/be
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