json - JavaScript Closures, Really simple example with jsFiddle -

I'm trying to understand JavaScript Cloger. I node Which is in, but I do not think this is a big issue (except error code).

Here is my slim code:

(Hmm. I'm new to this snippet content. I also created one) Current error code Uncustom Type error : Uncertain can not determine the value of the property I am obviously missing some idiots. Is there any way to make my cake and drink beer? I am learning how this asynchronous stuff works, unfortunately, it is a very difficult time to start with the process of learning in pure essence concepts. I need a solid example to start, and since then I can extrapolate the abstract back.

Anyone came here before? Why does not this work? Thx