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Hello Nigel,

In Javascript there is not object itself, what you get is always a reference to an object, even when you do this:

var a = {};

Anyway, that's not the problem here. DOM "get" returns a reference to a DOM element, and "addClass" is not a DOM method, that's why you cannot use the chain approach with it.

In the case of the second sentence, DOM "addClass" is a YUI 2 implementation. It uses "get" to collect the reference, then apply a regular expression to see if that class is already applied, if not, it will add it to the class attribute.

That said, YUI 3 uses a different approach, Y.one, Y.all and all the other methods that interact with DOM elements use a NODE object instead of a DOM element, which is a YUI 3 implementation to encapsulate a DOM element, and that's why you can do chaining:



Best Regards,
Caridy