pi.js

var points_total = 0;
var points_inside = 0;
var x, y, i;
while(true) {
    for(i = 0; i < 10000; i++) {
      x = Math.random();
      y = Math.random();
      points_inside += 2 + ~(x*x + y*y);
    }
    points_total += i;
    console.log(points_inside + "/" + points_total + " pi == " + (4 * points_inside / points_total));
}