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<html><body><h1>JavaScript Operators</h1><h2>The typeof Operator</h2><p>The typeof operator returns the type of a variable or an expression:</p><p id="demo"></p><script>document.getElementById("demo").innerHTML = "'John' is " + typeof "John" + "<br><br>" +"('John' + 'Doe') is " + typeof ("John" + "Doe") + "<br><br>" +"3.14 is " + typeof 3.14 + "<br><br>" +"33 is " + typeof 33 + "<br><br>" +"(33 + 66) is " + typeof (33 + 66) + "<br><br>" +"NaN is " + typeof NaN + "<br><br>" +"true is " + typeof true + "<br><br>" +"false is " + typeof false + "<br><br>" +"1234n is " + typeof 1234n + "<br><br>" +"Symbol() is " + typeof Symbol() + "<br><br>" +"x is " + typeof x;</script></body></html>