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<!DOCTYPE html> <html> <body> <p>The typeof operator returns the type of a variable, object, function or expression.</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = typeof "john" + "<br>" + typeof 3.14 + "<br>" + typeof NaN + "<br>" + typeof false + "<br>" + typeof [1,2,3,4] + "<br>" + typeof {name:'john', age:34} + "<br>" + typeof new Date() + "<br>" + typeof function () {} + "<br>" + typeof myCar + "<br>" + typeof null; </script> </body> </html>