A Simple Class

Animal = $.klass({ init: function( sound ){ this.sound = sound; }, say: function( msg ){ alert( this.sound + ', ' + msg ); } })

• init called automatically during instantiation.

Instantiating and Using Class

``` fido = new Animal( "Ruff" );

fido.say( "Kibbles and Bits" ); // Ruff, Kibbles and Bits ```

Subclass With Inheritance

``` Dog = $.klass( Animal, { init: function( name ){ this.name = name; this.up( arguments, 'Woof Woof' ); }, say: function( msg ){ this.up( arguments, this.name + ': ' + this.noise + msg ); } })

fido = new Dog( "Fido" ); fido.bark( 'I want Kibbles and Bits' ); // alert => "Fido: Ruff! I want Kibbles and Bits" ```

• this.up calls superclass
• 'arguments' must be passed in. Ugly but lightest way to get code superclass calling to work.

Using Binding