Question

In the snippet below.

Is all of local storage pulled from the disk into the variable cache?

(function(){
    var publik = {}, 
        cache = localStorage;

    publik.get = function(){};  // getter
    publik.set = function(){};  // setter
    return publik;
})()

Yes/No and Why.

Answer 1

What you are storing in a variable is a pointer to the localStorage object, this object does not “contains” the disk data, it gives it to you when you ask for it.

So no, it does not pull the disk data into memory

Update:

If you want to cache the local storage you can interate it and ask for every key one by one

for (var key in localStorage)
    cache[key] = localStorage[key];

Here you ASK the local storage for every key and it reads it.