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<title>JavaScript instanceof operator</title>
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<pre> <!-- Use pre element for work document.writeln() method -->
<script type="text/javascript">
var num1 = new Number(15);
document.writeln("1:", num1 instanceof Number); // Returns true
var num2 = 10;
document.writeln("2:", num2 instanceof Number); // Return false
document.writeln("3:", true instanceof Boolean); // false
document.writeln("4:", 0 instanceof Number); // false
document.writeln("5:", "" instanceof String); // false
document.writeln("6:", new Boolean(true) instanceof Boolean); // true
document.writeln("7:", new Number(0) instanceof Number); // true
document.writeln("8:", new String("") instanceof String); // true
</script>
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