const myobject = {
  name: "John",
  age: 30,
  showinfo: function() {
    let message = "Name: " + myobject.name + "\n";
    message += "Age: " + myobject.age;
    alert(message);
  },
  changename: function(newname) {
    const oldName = myobject.name;
    myobject.name = newname;
    return oldName;
  }
};
const old = myobject.changename("Jonathan");
alert("Old name was: " + old);  // "Old name was: John"