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<title>JavaScript typeof Operator</title>
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<pre> <!-- Use pre element for work document.writeln() method -->
<script type="text/javascript">
var name = 'Opal Kole';
var age = 48;
var married = true;
var experience = [2010, 2011, 2012, 2013, 2014];
var message = function(){ console.log("Hello world!"); }
var address;
document.writeln("name : ", typeof(name)); // Returns "string"
document.writeln("name : ", typeof name); // Returns "string"
document.writeln("age : ", typeof age); // Returns "number"
document.writeln("married : ", typeof married); // Returns "boolean"
document.writeln("age : ", typeof experience);// Returns "object"
document.writeln("experience: ", typeof message); // Returns "function"
document.writeln("address : ", typeof address); // Returns "undefined"
</script>
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