```
$.each(data, function(i){
        _(catalog.add(this));//iterating through each object in objectStore
});

```

I was wondering what difference does it make if i exclude the underscore before the function call.

**Update**

The OP is referring to the [jquery indexeddb plugin](https://github.com/axemclion/jquery-indexeddb/blob/master/jquery.indexeddb.js).