The Prototype Object

https://subscription.packtpub.com/video/programming/9781800206878/p1/video1_3/-the-prototype-object

by Dominic Myers

JavaScript

function User(firstName, lastName, age, gender){
	this.firstName = firstName;
  this.lastName = lastName;
  this.age = age;
  this.gender = gender;
}
var user1 = new User("Dominic", "Myers", 47, "male");
var user200 = new User("Katrina", "Myers", 48, "female");
User.prototype.emailDomain = "@facebook.com"
User.prototype.getEmailAddress = function(){
	return this.firstName + "." + this.lastName + this.emailDomain
}
console.log(user1, user200.getEmailAddress())