The toString() method returns a string representing the specified Boolean object.
bool.toString()
A string representing the specified Boolean object.
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.
toString
In the following code, flag.toString() returns "true":
var flag = new Boolean(true); var myVar = flag.toString();
| 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 Latest Draft (ECMA-262) The definition of 'Boolean.prototype.toString' in that specification. | Draft |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | Yes | Yes | 1 | Yes | Yes | Yes |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | Yes | Yes | Yes | 4 | Yes | Yes | Yes |
| Server | |
|---|---|
| Node.js | |
| Basic support | Yes |
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean/toString