code: function () {
          if (!this.fidx) {
            this.fidx = 0;
          }
          this.prefix = this.prefix || [(this.name || 'F'), (+new Date).toString(36)].join('-');
  
          return this.prefix + (this.fidx++).toString(36);
        }
docs: Description: Returns a random, alphanumeric string  Arguments: Length (Integer): Length of string to be generated. Defaults to random integer.  Returns: Rand (String): Pseudo-random, alphanumeric string.