JavaScript Boolean Object

The boolean object is used to represent the boolean value that is true or false. If the value is 0, -0, null, false, “”, undefined, NaN then it is considered as false value.

Syntax for Boolean Object

Following is the syntax to define Boolean variables using Javascript.

[code lang=”html”] var a= new boolean (value)
[/code]

Boolean Properties

Properties	Description
constructor	It is used to provide a reference to Boolean function of the particular object.
prototype	It is used to add properties and methods.

Boolean Methods

Methods	Description
toString( )	It specifies Boolean object(true or false) using string.
toSource( )	It is used to return the string using source code of the Boolean object.
valueOf( )	It is used to return the value of boolean object of the given parameter

Example Using Boolean Methods

[code lang=”html”] <html>
<body>
<script type="text/javascript">

var a = new Boolean(1);
document.write( "The value is : " + a.valueOf() );
document.write( "<br>The string is : " + a.toString() );

</script>
</body>
</html>
[/code]

In the above program we have used boolean methods.
We have used two methods in the program i.e. valueOf , toString.
We have declared a boolean variable “var = new Boolean( 1);” where 1 is equal to true.
document.write( “The value is : ” + a.valueOf() ); is used to return the value of the boolean object .
document.write( “The string is : ” + a.toString() ); is used to specify true or false using string.