idefine2

var Person = Class.create();Person.prototype = {  initialize: function(name, age) {    this.name = name;    this.age = age;  },    toJSON: function() {    return ('My name is ' + this.name +       ' and I am ' + this.age + ' years old.').toJSON();  }};var john = new Person('John', 49);Object.toJSON(john);//-> '"My name is John and I am 49 years old."'