Thanks for your reply. Some parts of my reply are below in you text.
If you want to iterate over the members of an object you have to use
'hasOwnProperty' as showed at the first post. JavaScript iterate over
all the prototypes members if you do anything. Why a library can't
assume that object.prototype has been augmented ?
Maybe it will reduce the performance a bit ... but is it
significance ?
/Greg
On Jul 22, 5:01 pm, "Michael Geary" <[EMAIL PROTECTED]> wrote:
> Greg, you can't extend Object.prototype. It will break more than just
> jQuery. As you noted, there is a workaround, but it requres code to be added
> to every for loop, which has a performance impact.
Does the performance impact have been measured ?
>
> Instead, simply revise the Object.prototype.Inherits function from that page
> so it does not need to be an Object method.
>
> Change this code:
>
> Object.prototype.Inherits = function( parent ) {
> if( arguments.length > 1 )
> parent.apply( this, Array.prototype.slice.call( arguments, 1 )
> );
> else
> parent.call( this );
> };
>
> to:
>
> function InheritObject( self, parent ) {
> if( arguments.length > 1 )
> parent.apply( self, Array.prototype.slice.call( arguments, 1 )
> );
> else
> parent.call( self );
> };
>
> And where you code:
>
> this.Inherits( Mammal, name );
>
> Change it to:
>
> InheritObject( this, Mammal, name );
>
> Problem solved.
The problem is the same, 'InheritObject' is global and some bad things
will happen if a library use the same name.
>
> The Function.prototype.Inherits method is not as much of a problem. It won't
> break any code unless you include some other code that also uses the same
> method name for a different function.
>
> If that's a concern, you could give that function the same treatment. You
> may want to do this just for consistency anyway.
>
> Change:
>
> Function.prototype.Inherits = function( parent ) {
> this.prototype = new parent();
> this.prototype.constructor = this;
> };
>
> To:
>
> InheritFunction = function( self, parent ) {
> self.prototype = new parent();
> self.prototype.constructor = self;
> };
>
> And change:
>
> Cat.Inherits( Mammal );
>
> To:
>
> InheritFunction( Cat, Mammal );
>
> -Mike
>
> > -----Original Message-----
> > From: jquery-en@googlegroups.com
> > [mailto:[EMAIL PROTECTED] On Behalf Of Greg
> > Sent: Tuesday, July 22, 2008 3:36 AM
> > To: jQuery (English)
> > Subject: [jQuery] Augmentation of Object.prototype
>
> > Hi everyone,
> > I want to use the code from this page :
> >http://www.coolpage.com/developer/javascript/Correct%20OOP%20f
> > or%20Javascript.html
> > to enable true inheritance with JavaScript ... but sadly
> > JQuery doesn't support a such possibility.. Why ?
>
> > If you take care by using "hasOwnProperty()" when you iterate
> > to an object you will never reach my added functions. Like that :
> > for(var m in o) {
> > if (m.hasOwnProperty()) {
> > // use of m..
> > }
> > }
>
> > Or better with a such augmentation ;o) :
> > Object.prototype.each = function(f) {
> > for (var k in this) {
> > if (this.hasOwnProperty(k)) {
> > f(k, this[k]);
> > }
> > }
> > };
>
> > Is there an explanation of this limitation ?
>
> > TIA
> > /Greg
