Node.js - execute the anonymous function that was passed to another function

I understand that Node.js has the concept of event-driven, asynchronous callbacks, by utilizing an event loop.

database.query("SELECT * FROM hugetable", function(rows) { var result = rows; });
console.log("Hello World");

Here, instead of expecting database.query() to directly return a result to us, we pass it a second parameter, an anonymous function. Now, Node.js can handle the database request asynchronously. Provided that database.query() is part of an asynchronous library, this is what Node.js does: just as before, it takes the query and sends it to the database. But instead of waiting for it to be finished, it makes a mental note that says "When at some point in the future the database server is done and sends the result of the query, then I have to execute the anonymous function that was passed to database.query()."

I am trying the same with a sample code (as I am a newbie and not reached till Node.js DB interactions):

[root@example]# cat server8.js
function myfun(noparm , afterend)
{
         for ( var i =0; i < 10; i ++)
                console.log("The valus is " + i);
}

function mynextfn()
{
        console.log("Hello World");
}
function afterend()
{
        console.log("Hello afterend");
}

myfun(0, afterend);
mynextfn();
[root@idc-bldtool01 example]# node server8.js
The valus is 0
The valus is 1
The valus is 2
The valus is 3
The valus is 4
The valus is 5
The valus is 6
The valus is 7
The valus is 8
The valus is 9
Hello World
[root@iexample]#

As such I do not see the " concept of event-driven, asynchronous callbacks, by utilizing an event loop" ?

Can anyone please help me in implementing some basic examples?