pseudoclassical-oop.js

(function() {
  'use strict';

  Function.prototype.inherits = function(Parent) {
    this.prototype = new Parent();
    this.prototype.constructor = this;
  };

  var Person = function (name) {
    this.name = name;
  };

  Person.prototype.sayHello = function() {
    return 'Hi I am ' + this.name;
  };

  var Student = function(name, grade) {
    Person.call(this, name);
    this.grade = grade;
  };

  Student.inherits(Person);
  
  var p = new Person('Roy');
  var s = new Student('Moss', 5);

  console.log(p.constructor === Person); //true
  console.log(s.constructor === Student);  //true

  console.log(s instanceof Student);  //true
  console.log(s instanceof Person); //true

  console.log(s.sayHello());  //Hi I am Moss
}());