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<html><body><h1>JavaScript Operators</h1><h2>The typeof Operator</h2><p>The value (and the data type) of a variable with no value is <b>undefined</b>.</p><p id="demo"></p><script>let car;document.getElementById("demo").innerHTML =car + "<br>" + typeof car;</script></body><!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_datatypes_undefined by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 16:49:19 GMT --></html>