reusable object in javascript; uses a function

personObject.js

(function() { // protect namespace, Immediately-Invoked Function Expression (IIFE)

  function Person( firstName, lastName) {
    this.firstName = firstName;
    this.lastName = lastName;
  }
  Person.prototype.greet = function() { // prototypes allows object to inherit function properties
      return "hello my name is " + this.firstName;
    }
  
  Person.prototype.farm = function() { 
		console.log('look ma! I\'m farming!');
	}
	

  var alex = new Person( 'Alex', 'Kale' );
  console.log( alex, alex.greet() );
  var GrumpyCat = new Person( 'Grumpy', 'Cat' );
  console.log( GrumpyCat );
  
  // inheritance
  
  function Dog() {
  	this.numLegs = 4;
  	this.fur = true;
  }
  Dog.prototpye.barks = 'loudly';
  
  function Pug() {
  	
  }
  
  Pug.prototype = Dog.prototype;
  Pug.prototype.sleep = function() {
  	console.log('2 hours');
  }
  
  var jack = new Pug();
  console.log(jack);
  
  Dog.prototype.foo = 1;


	console.log( jack );
  

})();