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<html><body><h2>JavaScript Objects</h2><p id="demo"></p><script>const person = { firstName: "John", lastName: "Doe", id: 5566,};person.name = function() { return (this.firstName + " " + this.lastName).toUpperCase();};document.getElementById("demo").innerHTML ="My father is " + person.name(); </script></body><!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_object_method_toupper by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:06:52 GMT --></html>