[Decode]

function Person(name, age) {
	this.name = name;
	this.age = age;
}

Person.prototype.method = function() {
	alert(this.name + this.age);
};

function Student(name, age) {
	Person.apply(this, arguments);
}

Student.prototype = Object.create(Person.prototype);
Student.prototype.constructor = Student;
Student.prototype.method2 = function() {
	alert("Bla-bla-bla");
};

var vasya = new Person('Василий', 25);
var petya = new Student('Петя', 18);

function type() {
	(this.method2 !== undefined) ? alert('Student') : alert('Person');
}

type.call(vasya);
type.call(petya);