js prototype

prototype.js

function Animal(animal, noise) {
  this.noise = noise;
  this.animal = animal;

}

Animal.prototype.makeNoise = function() {
    console.log('I\'m a ' + this.animal + ' - ' + this.noise)
  }

var dog = new Animal("dog", "woof");
var dog2 = new Animal("dog", "woof");

function makeNoise() exists as a prototype across all Animal objects, ultimately saves memory