The valueOf()
method returns the primitive value of a String
object.
str.valueOf()
A string representing the primitive value of a given String
object.
The valueOf()
method of String
returns the primitive value of a String
object as a string data type. This value is equivalent to String.prototype.toString()
.
This method is usually called internally by JavaScript and not explicitly in code.
valueOf()
var x = new String('Hello world'); console.log(x.valueOf()); // Displays 'Hello world'
Specification | Status | Comment |
---|---|---|
ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.1. |
ECMAScript 5.1 (ECMA-262) The definition of 'String.prototype.valueOf' in that specification. | Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'String.prototype.valueOf' in that specification. | Standard | |
ECMAScript Latest Draft (ECMA-262) The definition of 'String.prototype.valueOf' in that specification. | Living Standard |
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 |
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/valueOf