I like the simplicity of this, but I'm not crazy about how it merges two
distinct objects into one. TodayJS (and most class-based languages) let you
distinguish two things:
1. A set of properties relevant to the class itself.
2. A set of properties shared by each instance of the class.
In a class-based language, #1 up there is "static" methods and fields. So
when you do something like this in Java:
Integer.parseInt("1234");
The "parseInt" method isn't a method that you can call on an integer, it's a
method you call on the Integer class itself.
In Javascript, those are properties on the constructor:
function Point(x, y) {
this.x = x; this.y = y;
}
Point.zero = function() { return new Point(0, 0); }
Point.zero(); // "static" method.
The second set of properties are properties on ".prototype" in JS:
Point.prototype.flipX = function() {
this.x = -this.x;
}
var p = new Point(1, 2);
p.flipX();
p.x // -1
To me, those two sets are utterly distinct. This code looks pretty strange:
Point.flipX(); // What x?
var p = new Point(1, 2);
p.zero(); // This works, but what does it have to do with 'p'?
Your proposal would allow that, I think. For example, starting from yours:
// Superclass
var Person = {
constructor: function (name) {
this.name = name;
},
describe: function() {
return "Person called "+this.name;
}
};
I could do:
var bob = new Person("Bob");
bob.constructor("Fred"); // I guess I'm Fred now.
Does the above seem strange to you too?
- bob
On Sat, Jun 25, 2011 at 1:11 PM, Axel Rauschmayer <[email protected]> wrote:
> FWIW: I’ve written down my current understanding.
>
> http://www.2ality.com/2011/06/prototypes-as-classes.html
>
> --
> Dr. Axel Rauschmayer
>
> [email protected]
> twitter.com/rauschma
>
> home: rauschma.de
> blog: 2ality.com
>
>
>
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