Intro to javascript custom objects

intro-to-js-custom-objects

//modified from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Introduction_to_Object-Oriented_JavaScript

//class (can also be defined as anonymous function in the form of var Person = function () {...};)
function Person(firstName) {
  //property
  this.firstName = firstName;
  // method (using anonymous function)
  this.skyte = function() {
        return "I'll be famous some day. Remember my name: " + firstName + "!";
    }
}
//instantiation of objects
var person1 = new Person('Mary');
var person2 = new Person('John');

// show the firstName property of the objects
console.log('person 1 is ' + person1.firstName); 
// outputs "person1 is Alice"
console.log('person 2 is ' + person2.firstName); 
// outputs "person2 is Bob"

//call Person class's skyte method
console.log(person1.skyte());

//define static variable for Person class (shared by all instances) 
Person.resperatorySystem = "lungs";

//define static method for Person class (shared by all instances)
//and use static variable 
Person.breathe = function() {
    return "I am breathing through my "+ Person.resperatorySystem;
};

//show output of static method
console.log(Person.breathe());

//use a prototype method to define a new method for the Person class
Person.prototype.sayHello = function() {
  return "Hi, I'm " + this.firstName;
};

//show output of the prototype method
console.log(person1.sayHello());