an attempt at multiple inheritence that feels crappy

multInheritence.js

var udemObj = {
  set: function (options){
    for(option in options){
      if (this[option] !== undefined){
        this[option] = options[option];
      }
    }          
    return this;
  },
  toObjectLiteral: function (){
    var returnObject = {};
    for (prop in this){
      if (typeof this[prop] !== 'function'){
        returnObject[prop] = this[prop]
      }
    }
    return returnObject;
  },
};

user = Object.create(udemObj);
user.template = null;
user.id = null;
user.arrayNum = null;
user.name = null;
user.classID = null;
user.sessionID = null;
user.toHtml = function (){};
    
var userClone = (Object.create(user));
userClone.set({id: 2, name: "Marc"});
userClone.arrayNum = 4;
userClone.toObjectLiteral();