The Boolean Object
It
returns either true or false. It is wrapper class and a member of global
objects. It returns false when the object is passed with values, such as 0,
empty string, false, null, undefined, not a number(NaN).
It can be created in following ways
1.
Using
boolean literal
2.
Using the
Boolean object as function
3.
Using the
testable expressions
Using Boolean literal
It uses
true or false, to inherit the member of the Boolean object.
var
bool=true;
document.write(bool);
document.write(bool.toString());
Using Boolean object as function
They are
used to pass the value as an argument.
var
bool=Boolean(false);
Using testable expressions
They are
used to evaluate the output in Boolean values.
If(true)
{
}
Properties of Boolean object
|
Property
|
Description
|
|
constructor
|
Returns the function, which has
created the prototype of the Boolean object
|
|
prototype
|
Allows us to add properties and
methods to an object
|
Methods of the Boolean object
|
Method
|
Description
|
|
toString()
|
Converts the Boolean value into
string and returns the string
|
|
valueOf()
|
Returns the primitive value of
an Boolean object
|
Example
<!DOCTYPE html>
<html>
<head>
<title>JavaScript Boolean Objects</title>
</head>
<body>
<h1>JavaScript Boolean Objects</h1>
<script>
var bool1 = new Boolean(0);
var bool2 = new Boolean(7);
var bool3 = new Boolean('');
var bool4 = new Boolean('One');
var bool5 = new Boolean('false');
var bool6 = new Boolean(null);
var bool7 = new Boolean(NaN);
document.write('0 value is :' + bool1 + '<br/>');
document.write('5 value is :' + bool2 + '<br/>');
document.write('empty string value is :' + bool3 + '<br/>');
document.write('One value is :' + bool4 + '<br/>');
document.write('false value is :' + bool5 + '<br/>');
document.write('null value is :' + bool6 + '<br/>');
document.write('NaN value is :' + bool7 + '<br/>');
</script>
</body>
</html>
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