[General] LK JS OO Architecture

[Philip Weaver]

Javascript is a message-oriented OO system except that it doesn't support
classes per se -
prototypes<http://en.wikipedia.org/wiki/Prototype-based_programming>
instead.
The LIvely team added class support with the function "subclass" which is
defined in Base.js. I'm sure the team will answer this completely - I can't
answer the Smalltalk analogy.
TextMorph.subclass('mynamespace.MyTextMorph', {
 initialize : function($super) {
 $super(new Rectangle(0, 0, 200, 30), 'Some Text');
}
});

For a comparison, this is plain Javascript - and this is the most common way
to create objects to message.
Person = function() {
 this.initialize();
};

Person.prototype = {
 initialize : function() {
console.log('Person.initialize');
},
 sayHello : function() {
console.log('Hello');
}
};

var person = new Person();
person.sayHello();

Phil

On Mon, Apr 20, 2009 at 9:26 PM, Owen Densmore <owen at backspaces.net> wrote:

> OK, now for the dumb question of the month: How in the world does LK
> wrestle JS into being a message based, OO system?
>
> I'm reading "Object-Oriented JavaScript" by Stoyan Stefanov and it
> takes me back to the days that Lisp and Scheme declared that they
> simply didn't need OO architectures, they can invent their own so
> easily it was not important.  They forgot to mention that they needed
> the rest of the world to agree with which ever system they chose! ..
> few of the alternatives interoperate!
>
> So the book points out about a dozen ways to be OO in JS.  I know LK
> uses Prototype.  Is that the Answer?  Or did LK figure out a sane
> system that fits the Smalltalk messaging model well that isn't in the
> several JS OO patterns?
>
> Whew!
>
>     -- Owen
>
>
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