A minor correction to Angus Croll's Fibonacci generator (as illustrative of the comma operator).

pedantic-fibonacci.js

/**
 * Apologies to Angus Croll; re:
 * http://javascriptweblog.wordpress.com/2011/04/04/the-javascript-comma-operator/
 */

// Yes, I am being a pedantic jerk, but:

var r = [1], n = 0, a = 0, b, next;

function nextFibonacci(){
    next = a + (b = r[r.length - 1]);
    return b = (a = b, next);
}
 
while(n++ < 10) {
    r.push(nextFibonacci());
}
 
print(r); //[1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]

// ..._technically_ that's a Fibonacci sequence.