duelyster.js

(function(){
  var Duelyster = function () {
    this.name = "Samuel";
  };

  Duelyster.prototype.hi = function () {
    alert(this.name);
  };

  var main = function () {
    var duelyster = new Duelyster();
    duelyster.hi();
  };

  main();
})();