Regarding JavaScript for() loop voodoo

Question

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

for (INITIALIZER; STOP CONDITION         


        

Answer 1

That statement does comply with your initial format.

It turns out you could add more than one sentence of each using "," ( comma )

So:

for (var j, x, i = o.length; i; j = parseInt(Math.random() * i), x = o[--i], o[i] = o[j], o[j] = x);

Could be analyzed like this:

for (var j,                           //INITIALIZER(s)
         x,
         i = o.length;

     i;                               // STOP CONDITION ( i ) 

     j = parseInt(Math.random() * i), // INC(DEC)REMENTER
     x = o[--i],
     o[i] = o[j],
     o[j] = x);  // CODE ( ; ) 

As you see, it fits completely in your initial format.