javascript variables, What does var x = a = {} do?

Question

I see in jQuery something like this:

jQuery.fn = jQuery.prototype = {}

Why is this being done? Isn't this the same thing just saying jQuery.prototype = {}? I'm not sure I understand what Resig is accomplishing here.

Answer 1

The same as:

jQuery.prototype = {}
jQuery.fn = jQuery.prototype

In my opinion having all in one line makes more clear that your assigning the same value to both variables

Answer 2

This is equivalent to:

jQuery.prototype = {}
jQuery.fn = jQuery.prototype

In other words jQuery.fn and jQuery.prototype both point to the same object.