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Showing content from https://webplatform.github.io/docs/javascript/Boolean below:

Boolean · WebPlatform Docs

Boolean Summary

Creates a new Boolean (true/false) value.

Syntax 
new Boolean ([ boolValue ])

([ boolValue ])
boolValue
Required. The initial Boolean value for the new object. Possible values are true and false.

Other values (like 1 and 0) are converted to a Boolean expression.

Return Value

If the boolean value is omitted, or is false , 0, null , NaN , or an empty string, Boolean returns false. Otherwise, it returns true true.

Examples

Using Boolean to define a test condition

var x = new Boolean(false);

if (x) {
  
}

Using implicit Boolean constructor


var IsLoggedIn = true;
if (isLoggedIn) {
  
}
Remarks

The Boolean object is a wrapper for the Boolean data type. JavaScript implicitly uses the Boolean object whenever a Boolean data type is converted to a Boolean object.

You rarely instantiate the Boolean object explicitly.

Properties

The following table lists the properties of the Boolean object.

Property Summary prototype Returns a reference to the prototype for a Boolean. Functions

The following table lists the functions of the Boolean object.

Methods

The following table lists the methods of the Boolean object.

Method Summary constructor Initializes a Boolean object. toString Returns a string representation of a Boolean object. See also Specification

Boolean Objects ECMAScript® Language Specification Standard ECMA-262 5.1 Edition / June 2011

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