JSFiddle - React, Tailwind, and code Playground

JavaScript

var user = {
   name: "Vasya",
	family: "Pupkin",
  
  get fullName(){
  	var result = "";
		for(var key in user){
			result = result + user[key]
		}
		return result.length
  }
 }

alert("в объекте user " + user.fullName + " символов");