JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://amatiasq.com/fiddle-console.js"></script>

JavaScript

var datos: { 
 		nombre: '', 
    apellidos: '', 
    fullname: function() { 
        return this.nombre + ' ' + this.apellidos;
    } 
};

var persona = Object.getPrototypeOf(datos);

alert(persona.name);
alert(persona.lastname);
alert(persona.fullname());