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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, object, function or expression:</p><p id="demo"></p><script>document.getElementById("demo").innerHTML = "'John' is " + typeof "John" + "<br>" +"3.14 is " + typeof 3.14 + "<br>" +"NaN is " + typeof NaN + "<br>" +"false is " + typeof false + "<br>" +"[1, 2, 3, 4] is " + typeof [1, 2, 3, 4] + "<br>" +"{name:'John', age:34} is " + typeof {name:'John', age:34} + "<br>" +"new Date() is " + typeof new Date() + "<br>" +"function () {} is " + typeof function () {} + "<br>" +"myCar is " + typeof myCar + "<br>" +"null is " + typeof null;</script></body></html>