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<html><body><h1>JavaScript Operators</h1><h2>The typeof Operator</h2><p>Variables can be emptied if you set the value to <b>undefined</b>.</p><p id="demo"></p><script>let car = "Volvo";car = undefined;document.getElementById("demo").innerHTML ="<p>The value of car is " + car +"<p>The typeof car is " + typeof car;</script></body></html>