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