simple node.js inheritance example

inheritance.js

var util = require("util");

// simple class
function A() {
    this.self= this;
    this.className = "classA";
    this.myVar = "ownerA";
}

// class methods
A.prototype.getMyVar = function() {
    return this.myVar;
};

// inherited class with parameters
function B(classNameOverride) {
    A.call(this);
    this.self.className = classNameOverride || "classB";
}
util.inherits(B, A);

// inherited class using super class parameters
function C() {
    B.call(this, "classC");
}
util.inherits(C, B);

// method override
C.prototype.getMyVar = function() {
    return "ownerC";
};

var a = new A();
var b = new B();
var c = new C();

console.log(a.className + ' ' + b.className + ' ' + c.className);
console.log(a.getMyVar() + ' ' + b.getMyVar() + ' ' + c.getMyVar());