We're looking for a person or people to help audit MDN to find places we could speed up. Is this you or someone you know? Check out the RFP: https://mzl.la/2IHcMiE



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

Property attributes of prototype
Writable No
Enumerable No
Configurable No


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


Returns the function that created an instance's prototype. This is the Boolean function by default.
Properties inherited from Object:


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.
Returns a string of either "true" or "false" depending upon the value of the object. Overrides the Object.prototype.toString() method.
Returns the primitive value of the Boolean object. Overrides the Object.prototype.valueOf() method.


Specification Status Comment
ECMAScript 1st Edition. Implemented in JavaScript 1.0 Standard Initial definition.
ECMAScript Language Specification 5.1th Edition (ECMA-262) Standard  
ECMAScript Language Specification 6th Edition (ECMA-262) Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)


Document Tags and Contributors

 Contributors to this page: Sevenspade
 Last updated by: Sevenspade,