Boolean.prototype

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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 AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
prototypeChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 3Opera Full support YesSafari Full support YesWebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support 1.0nodejs Full support Yes

Legend

Full support  
Full support