how to update object properties under the prototype 'augmentation' approach?

[Gallagher Polyn]

Hey all,

How do I transfer properties, for example pushing to an array my receiverClass, while it is augmented by a 'givingClass' under Addy Osmani's augmentation approach?

I seem only able to effect the transfer of prototype functions, but can't monkey around with other property members or set properties on the receivingClass :(

// Extend an existing object with a method from another

function augment( receivingClass, givingClass ) {

 

    // only provide certain methods

    if ( arguments[2] ) {

        for ( var i = 2, len = arguments.length; i < len; i++ ) {

            receivingClass.prototype[arguments[i]] = givingClass.prototype[arguments[i]];

        }

    }

    // provide all methods

    else {

        for ( var methodName in givingClass.prototype ) {

 

            // check to make sure the receiving class doesn't

            // have a method of the same name as the one currently

            // being processed

            if ( !Object.hasOwnProperty.call(receivingClass.prototype, methodName) ) {

                receivingClass.prototype[methodName] = givingClass.prototype[methodName];

            }

 

            // Alternatively (check prototype chain as well):

            // if ( !receivingClass.prototype[methodName] ) {

            // receivingClass.prototype[methodName] = givingClass.prototype[methodName];

            // }

        }

    }

}