Privileged methods

privileged.js

/**
 * Privileged methods.
 * 
 * From http://www.crockford.com/javascript/private.html
 */
function Container(param) {
  function dec() {
    if (secret > 0) {
      secret -= 1;
      return true;
    } else {
      return false;
    }
  }

  this.member = param;
  var secret = 3;
  var that = this;

  this.service = function () {
    return dec() ? that.member : null;
  };
}