Classical Inheritance in Javascript

classical_inheritance.js

//parent
var Person = function(firstName){
	this.firstName = firstName;
};

Person.prototype.walk = function(){
	console.log("I am walking.");
};

Person.prototype.sayHello = function(){
	console.log("I am " + this.firstName);
};

//child
function Student(firstName, subject){
	
	Person.call(this, firstName);
	
	this.subject = subject;
}

Student.prototype = Object.create(Person.prototype);

Student.prototype.constructor = Student;

Student.prototype.sayHello = function(){
	console.log("Student\'s name is " + this.firstName);
};

Student.prototype.study = function(){
	console.log(this.firstName + " is studying");
};

var p1 = new Person("Deepak");
var p2 = new Person("Mohan");
p1.sayHello();
p1.walk();
p2.sayHello();
p2.walk();


var s1 = new Student("Jitesh");
var s2 = new Student("Vineeth");
s1.sayHello();
s1.study();
s2.sayHello();
s2.study();