The Boolean.prototype property represents the prototype for the Boolean constructor.

Property attributes of Boolean.prototype
Writable no
Enumerable no
Configurable no

Description

Boolean instances inherit from Boolean.prototype. You can use the constructor's prototype object to add properties or methods to all Boolean instances.

Properties

Boolean.prototype.constructor
Returns the function that created an instance's prototype. This is the Boolean function by default.

Methods

Boolean.prototype.toSource()
Returns a string containing the source of the Boolean object; you can use this string to create an equivalent object. Overrides the Object.prototype.toSource() method.
Boolean.prototype.toString()
Returns a string of either "true" or "false" depending upon the value of the object. Overrides the Object.prototype.toString() method.
Boolean.prototype.valueOf()
Returns the primitive value of the Boolean object. Overrides the Object.prototype.valueOf() method.

Specifications

Specification Status Comment
ECMAScript 1st Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.0.
ECMAScript 5.1 (ECMA-262)
The definition of 'Boolean.prototype' in that specification.
Standard  
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Boolean.prototype' in that specification.
Standard  
ECMAScript Latest Draft (ECMA-262)
The definition of 'Boolean.prototype' in that specification.
Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung InternetNode.js
Basic supportChrome Full support YesEdge Full support YesFirefox Full support 1IE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yesnodejs Full support Yes

Legend

Full support  
Full support

Document Tags and Contributors

Last updated by: wbamberg,