node js inheritance of classes

node-js-inheritance

var util = require('util');

function BaseClass(data) {
    if (!data) {
      throw new TypeError('You must pass "data" in constructor');
    }

    console.log('base constructor');
    this.data = data;
}

BaseClass.prototype.getData = function () {
  console.log('get data from the base class');
	return this.data;
};

//Child

function ChildClass(data) {
	ChildClass.super_.apply(this, Array.prototype.slice.call(arguments));
}

util.inherits(ChildClass, BaseClass);

ChildClass.prototype.getData = function () {
	console.log('get data from the child class');

	return ChildClass.super_.prototype.getData.call(this);
};

var child = new ChildClass('test data');

console.log(child.getData());