On Tuesday, 2012-04-03 at 13:47 , Axel Rauschmayer wrote:
> I think you should make the distinction between [[Call]] and [[Construct]].
>
You can do it via (this insntanceof ..) already and dispatch to call /
construct if you want.
> But both would be great to have for objects. It’s probably best to create
> importable names.
>
Importable names won't allow shorter than function form though, so I think just
() {} is better.
>
> Then making the `new` operator available to object exemplars becomes indeed
> simple. For example:
>
> // Root object exemplar
> import Construct from somewhere;
> let ObjectExemplar = {
> [Construct](...args) {
> let inst = Object.create(this);
> let result = inst.init(...args);
> return (result === undefined ? inst : result);
> }
> }
>
>
>
> On Apr 3, 2012, at 22:00 , Irakli Gozalishvili wrote:
> > Hi,
> >
> > Please excuse me if this will sound too crazy, but this idea have being
> > growing in my head for so long that I can't stop myself from proposing it
> > here. I have experimented many different ways of doing inheritance in JS:
> >
> > 1. Starting with a simple sugar that reduces machinery involved, similar to
> > backbone.js
> > https://github.com/Gozala/extendables
> >
> > 2. Finishing with class free prototypal inheritance
> > https://github.com/Gozala/selfish
> >
> > I have to say that experience with selfish turned out very interesting, it
> > made things so much simpler no special forms, no twisted relations between
> > constructors and objects, just a plain objects. Most of these things are
> > not obvious until you start using them, but the fact that exemplars
> > (classes) are no different from regular objects in the system makes things
> > much simpler.
> >
> > That being said I have also came to realize that in most of the cases
> > functions as exemplars would be a better feet than objects. As a matter of
> > fact if objects could be made callable I think it could could have replaced
> > most of the things that classes are targeting in more elegant way.
> >
> > Here is more or less what I have in mind: https://gist.github.com/2295048
> >
> > // class
> > var Point = {
> > (x, y) {
> > this.getX = { () { return x; } }
> > this.getY = { () { return x; } }
> > }
> >
> > toString() {
> > return '<' + this.getX() + ',' + this.getY() + '>';
> > }
> > }
> >
> > var a = new Point(0, 0)
> > var b = new Point(1, 7)
> >
> > // Examples from class proposal
> >
> > // extend is like create with a diff that second arg is an object.
> > var SkinnedMesh = Object.extend(THREE.Mesh, {
> > (geometry, materials) {
> > // call the superclass constructor
> > THREE.Mesh.call(this, geometry, materials);
> >
> > // initialize instance properties
> > this.identityMatrix = new THREE.Matrix4();
> > this.bones = [];
> > this.boneMatrices = [];
> >
> > // ...
> > }
> >
> > update (camera) {
> > THREE.Mesh.update.call(this);
> > }
> > });
> >
> > Also such callable objects provide shorter alternative to current function
> > syntax:
> > // shorter than function
> >
> > numbers.
> > filter({ (x) { return x % 2 } }).
> > // maybe single expression can be even shorter like arrow functions ?
> > map({ (x) x * x }).
> > forEach({ (x) { this.add(x) } }, that);
> >
> >
> > Also this would allow interesting APIs similar to those found in clojure:
> >
> > // maps / sets similar like in clojure ?
> > var map = WeakMap(), key = {}, value = {};
> >
> > map.set(key, value);
> > map(key) // => value
> > key(map) // => value
> >
> >
> > And maybe built-ins could have it for doing `[]` work:
> >
> >
> > // Maybe even non-magical replacement for `[]`
> >
> > [ 'a', 'b', 'c' ](1) // => 'b'
> > ({ a: 1, b: 2 })('a') // => 1
> > ('b')({ a: 1, b: 2 }) // => 2
> >
> >
> >
> >
> > Regards
> > --
> > Irakli Gozalishvili
> > Web: http://www.jeditoolkit.com/
> >
> > _______________________________________________
> > es-discuss mailing list
> > [email protected] (mailto:[email protected])
> > https://mail.mozilla.org/listinfo/es-discuss
>
> --
> Dr. Axel Rauschmayer
> [email protected] (mailto:[email protected])
>
> home: rauschma.de (http://rauschma.de)twitter: twitter.com/rauschma
> (http://twitter.com/rauschma)
> blog: 2ality.com (http://2ality.com)
>
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