JavaScript - The Boolean Object


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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.

Syntax

Use the following syntax to create a boolean object.

var val = new Boolean(value);

Boolean Properties

Here is a list of the properties of Boolean object −

Property Description

constructor

Returns a reference to the Boolean function that created the object.

prototype

The prototype property allows you to add properties and methods to an object.

In the following sections, we will have a few examples to illustrate the properties of Boolean object.

Boolean Methods

Here is a list of the methods of Boolean object and their description.

Method Description

toSource()

Returns a string containing the source of the Boolean object; you can use this string to create an equivalent object.

toString()

Returns a string of either "true" or "false" depending upon the value of the object.

valueOf()

Returns the primitive value of the Boolean object.

In the following sections, we will have a few examples to demonstrate the usage of the Boolean methods.