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
Booleanfunction by default.
Methods
Boolean.prototype.toSource()- Returns a string containing the source of the
Booleanobject; 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
Booleanobject. 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 2017 Draft (ECMA-262) The definition of 'Boolean.prototype' in that specification. |
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) |