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.
Living Standard  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes Yes Yes Yes Yes Yes
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic support Yes Yes Yes Yes Yes Yes Yes

Document Tags and Contributors

 Last updated by: fscholz,