const factory = function(initialname) {
  const obj = {
    name: initialname,
    age: 30,
    showname: function() {
      alert(this.name);
    },
    changename: function(newname) {
      this.name = newname;
    }
  };
  return obj;
};
const employee1 = factory("John");
const employee2 = factory("Robert");
const employee3 = factory("Arthur");
alert(employee1.name + ", " + employee2.name + ", " + employee3.name);