Why does this work in jQuery?

Question

I'm trying to understand why something works the way it does in jQuery. When I want to apply a jQuery extension, for example datatables, I run the command:

$("#some_id").datatables(.. parameters ..);

I don't know why this works, obviously the DOM element didn't have a method datatables() beforehand.

Thanks!

Answer 1

$("#some_id") does not return a HTML DOM element, it returns a JQuery object wrapping it.

This JQuery object does have the datatables method.