random number generator, as seen on michalbe's blog

rng.js

/**
 * ent 8? don't use
 * 
 * @example
 *
 * var rng = new CustomRandom();
 * rng.next();
 * rng.next(2, 100);
 *
 * @see http://michalbe.blogspot.com/2011/02/javascript-random-numbers-with-custom_23.html
 */
function CustomRand (nseed) {
   var seed;
   var constant = Math.pow(2, 13)+1;
   var prime = 1987;
   var maximum = 1000;
   var seed = nseed || (new Date()).getTime();
   return {
      next: function(min, max) {
         seed *= constant;
         seed += prime;
         seed %= maximum;
        return min && max ? min+seed/maximum*(max-min) : seed/maximum;
      }
    }
}