dog and cat and animal

animals.js

function Animal() {
  this.legs = 4;
};

function Dog() {
  this.sound = 'woof';
};
Dog.prototype = new Animal();

function Cat() {
  this.sound = 'meow';
};
Cat.prototype = new Animal();


var d = new Dog();
console.log(d);
console.log(d.sound);
console.log(d.legs);

var c = new Cat();
console.log(c);
console.log(c.sound);
console.log(c.legs);