The valueOf() method returns the wrapped primitive value of a Number object.
numObj.valueOf()
A number representing the primitive value of the specified Number object.
This method is usually called internally by JavaScript and not explicitly in web code.
valueOf
var numObj = new Number(10); console.log(typeof numObj); // object var num = numObj.valueOf(); console.log(num); // 10 console.log(typeof num); // number
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.1. |
| ECMAScript 5.1 (ECMA-262) The definition of 'Number.prototype.valueOf' in that specification. | Standard | |
| ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Number.prototype.valueOf' in that specification. | Standard | |
| ECMAScript Latest Draft (ECMA-262) The definition of 'Number.prototype.valueOf' 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/Number/valueOf