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 theObject.prototype.toSource()
method. Boolean.prototype.toString()
- Returns a string of either
"true"
or"false"
depending upon the value of the object. Overrides theObject.prototype.toString()
method. Boolean.prototype.valueOf()
- Returns the primitive value of the
Boolean
object. Overrides theObject.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
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | Yes | Yes | Yes | Yes | Yes | Yes |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Document Tags and Contributors
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Contributors to this page:
schalkneethling,
fscholz,
jameshkramer,
Mingun,
Sheppy,
lmorchard,
ziyunfei,
Sevenspade,
delae,
Mgjbot,
Yuichirou,
Nickolay,
Wampa,
Maian,
Marcoos,
Dria
Last updated by:
schalkneethling,