The Boolean object represents two values, either "true" or "false". If value parameter is omitted or is 0, -0, null, false, NaN, undefined, or the empty string (""), the object has an initial value of false.
Here is a list of the properties of a Boolean object −
| Sr.No | Property & Description |
|---|---|
| 1 | constructor Returns a reference to the Boolean function that created the object. |
| 2 | prototype The prototype property allows you to add properties and methods to an object. |
Example
Here’s an example showing the usage of prototype Boolean object −
<html>
<head>
<title>JavaScript Boolean objec</title>
<script>
function book(title, author) {
this.title = title;
this.author = author;
}
</script>
</head>
<body>
<script>
var myBook = new book("WordPress Development", "Amit");
book.prototype.price = null;
myBook.price = 500;
document.write("Book title is : " + myBook.title + "<br>");
document.write("Book author is : " + myBook.author + "<br>");
document.write("Book price is : " + myBook.price + "<br>");
</script>
</body>
</html>