[General] Fwd: Why using Object.extend?

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[General] Fwd: Why using Object.extend?

Robert Krahn
Hi, Haowei.

Those properties and functions defined in the subclass construct are  
defined for instances of the class, i.e. they are added to the  
prototype property of a class. Object.extend, however, adds functions  
and properties directly to the given object, not its prototype property.

Robert


On Apr 25, 2009,@2:16 PM, Haowei Ruan wrote:

> Hi, i do not understand why still uses Object.extend, can't those
> properties be defined within the "subclass" construct?
> Thanks in advance!
>
> regards,
> Haowei
>
> code snippet:
> --------------------------------------------------------
> Gradient.subclass("LinearGradient", {
>
>   initialize: function($super, stopColor1, stopColor2, vector) {
>       vector = vector || LinearGradient.NorthSouth;
>       this.rawNode = NodeFactory.create("linearGradient",
>                      {x1: vector.x, y1: vector.y,
>                       x2: vector.maxX(), y2: vector.maxY()});
>       this.addStop(0, stopColor1).addStop(1, stopColor2);
>       return this;
>   }
>
> });
>
> Object.extend(LinearGradient, {
>   NorthSouth: rect(pt(0, 0), pt(0, 1)),
>   SouthNorth: rect(pt(0, 1), pt(0, 0)),
>   EastWest:   rect(pt(0, 0), pt(1, 0)),
>   WestEast:   rect(pt(1, 0), pt(0, 0))
> });
> ---------------------------------------------------------
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