I agree that this is really elegant. I have almost the exact same construct in a language I'm designing. I don't know if it has a place in JS, but you have my approval. :)
- Russ On Tue, Apr 3, 2012 at 4:00 PM, Irakli Gozalishvili <[email protected]>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] > https://mail.mozilla.org/listinfo/es-discuss > >
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