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First posted :
03/24/2008
Times viewed :
2714
JavaScript Boolean Object
Introduction
The Boolean object is a wrapper for the Boolean data type.
If you pass no value, 0, "" false, undefined or NAN then it will
evaluate to false. However if you pass this value to an if condition then it
will return true. So don’t confound the Boolean object with the boolen data
type. Everything else passed into the object of Boolean will return true.
Example
<html>
<head>
<script type="text/javascript">
// Returns
false
document.write("Returns
false:<br/>")
document.write(b
= new Boolean("") + "<br/>")
document.write(b
= new Boolean() + "<br/>")
document.write(b
= new Boolean(false) + "<br/>")
document.write(b
= new Boolean(NaN) + "<br/>")
document.write(b
= new Boolean(null) + "<br/>")
document.write(b
= new Boolean(undefined) + "<br/>")
