Boolean.prototype.toString()
The toString()
method returns a string representing the specified Boolean object.
Syntax
<var>bool</var>.toString()
Return value
A string representing the specified Boolean
object.
Description
The Boolean
object overrides the toString
method of the Object
object; it does not inherit Object.prototype.toString()
. For Boolean objects, the toString
method returns a string representation of the object.
JavaScript calls the toString
method automatically when a Boolean
is to be represented as a text value or when a Boolean
is referred to in a string concatenation.
For Boolean
objects and values, the built-in toString
method returns the string "true
" or "false
" depending on the value of the boolean object.
Examples
Using toString
In the following code, flag.toString()
returns "true
":
var flag = new Boolean(true); var myVar = flag.toString();
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. |
ECMAScript 5.1 (ECMA-262) The definition of 'Boolean.prototype.toString' in that specification. |
Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Boolean.prototype.toString' in that specification. |
Standard | |
ECMAScript 2017 Draft (ECMA-262) The definition of 'Boolean.prototype.toString' 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) |
See also
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/boolean/tostring