records.js

(function() {
  var Dancer = {
    "start-dance": ["this"],
    "stop-dance": ["this"]
  };
  var DancerImpl = (function() {
    var record = function(dancing) {
      return this.dancing = dancing;
    };
    record.prototype.$protocol = Dancer;
    record.prototype.startDance = function() {
      this.dancing = true;
      return console.log("I am now dancing");
    };
    record.prototype.stopDance = function() {
      this.dancing = false;
      return console.log("I am no longer dancing");
    };
    return record;
  })();
  var d = new DancerImpl();
  d.startDance();
  return d.stopDance();
})();