Prototypal Inheritance

base.js

var BaseModel = function(type){
 
  this.type = !type ? "BaseModel" : type ;
};
 
BaseModel.prototype.sayHello = function() {
  return "Hello " + this.type;
};
 
var User = function() {
  BaseModel.call(this);	
};
 
User.prototype = Object.create(BaseModel.prototype);
 
var model = new User();