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Rob Kinyon - Object.extend-0.02

  Ajax.Request.prototype = (new Ajax.Base()).extend({
      initialize: function( ... ) {
      }

      ...
  });

/*

=head1 NAME

Object.extend

=head1 DESCRIPTION

This provides a new method to the core class Object. The method, called extend(), is used to provide one way to implement inheritance.

=head1 DEPENDENCIES

This requires JSAN and Upgrade to be installed.

=cut

*/

try {
    JSAN.use( 'Upgrade.Function.apply' );
} catch (e) {
    throw "Object.extend requires JSAN to be loaded";
}

/*

=head1 CORE CLASS EXTENSIONS

These are extensions to core classes provided by JavaScript.

=cut

*/

/*

=head2 Object.extend( object )

The C<extend()> method is added to the builtin Object class, providing attribute inheritan
ce. It is used as so (example from Ajax.Request):

  Ajax.Request.prototype = (new Ajax.Base()).extend({
      initialize: function( ... ) {
      }

      ...
  });

This will provide Ajax.Request with all the methods and attributes found in Ajax.Base.

=cut

*/

if ( ! Object.extend ) {
    Object.extend = function(destination, source) {
        for (property in source) {
            destination[property] = source[property];
        }
        return destination;
    }
}

if ( ! Object.prototype.extend ) {
    Object.prototype.extend = function(object) {
        return Object.extend.apply(this, [this, object]);
    }
}

/*

=head1 CAVEATS

Modifying the prototype of core Javascript classes should be avoided, if possible. By doing this, you are modifying B<ALL> objects of this class, regardless of when they were instantiated or by whom, For some classes, such as Number and String, this includes primitives. This can lead to surprising effects and action-at-a-distance.

You have been warned.

=head1 SUPPORT

Currently, there is no mailing list or IRC channel. Please send bug reports and patches to the author.

=head1 AUTHOR

Rob Kinyon (rob.kinyon@iinteractive.com)

Originally written by Sam Stephenson (sam@conio.net)

My time is generously donated by Infinity Interactive, Inc. L<http://www.iinteractive.com>

=cut

*/