I was for quite some time under the impression that a `for` loop could exist *solely* in the following format:

```
for (INITIALIZER; STOP CONDITION; INC(DEC)REMENTER)
 {
    CODE
 }

```

This is, however, most *definitely* not the case; take a look at this JavaScript implementation of the [Fisher-Yates Shuffle](http://en.wikipedia.org/wiki/Knuth_shuffle):

```
shuffle = function(o)
 {
    for (var j, x, i = o.length; i; j = parseInt(Math.random() * i), x = o[--i], o[i] = o[j], o[j] = x);
    return o;
 };

```

This little snippet completely blows my mind; how in the world is so much going on inside a simple for loop declaration? I mean... it doesn't even open a brace! All of the magic is being done *right there* inside the `for` statement. It'd be absolutely wonderful if somebody could provide a relatively thorough explanation as to how in the world this voodoo is doing what it does. Much appreciated in advance.