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<html><body><h2>Using JavaScript Symbol()</h2><p id="demo"></p><script>const person = { firstName: "John", lastName: "Doe", age: 50, eyeColor: "blue"};let id = Symbol('id');person[id] = 140353;document.getElementById("demo").innerHTML = person[id] + " " + person.id;</script></body><!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_symbol by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 17:06:52 GMT --></html>