Object Oriented JavaScript : Classical Approach

dog_class.js

// Classical Approach

var Dog = function(name, breed, age, origin){
  this.name = name;
  this.breed = breed;
  this.age = age
  this.origin = origin

  this.bark = function() {
    return('bow wow!');
  }

  this.roll = function() {
    return(this.name + ' rolls over');
  }
}

var rover = new Dog('Rover', 'Pitbul', '3', 'England');
var lass = new Dog('Lass', 'Boxer', '3', 'India');

// Overides the prototype method
lass.bark = function(){
  return('woof!');
}

rover.bark();    // bow wow!
lass.bark();     // woof!
rover.roll();    // Rover rolls over
lass.roll();     // Lass rolls over