The valueOf() method returns the primitive value of a Symbol object.
Symbol().valueOf();
The primitive value of the specified Symbol object.
The valueOf method of Symbol returns the primitive value of a Symbol object as a Symbol data type.
JavaScript calls the valueOf method to convert an object to a primitive value. You rarely need to invoke the valueOf method yourself; JavaScript automatically invokes it when encountering an object where a primitive value is expected.
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Symbol.prototype.valueOf' in that specification. | Standard | Initial definition. |
| ECMAScript Latest Draft (ECMA-262) The definition of 'Symbol.prototype.valueOf' in that specification. | Draft |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | 38 | 12 | 36 | No | 25 | 9 |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | Yes | 38 | Yes | 36 | 25 | 9 | Yes |
| Server | |
|---|---|
| Node.js | |
| Basic support | Yes |
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/valueOf