The Number.NaN static data property represents Not-A-Number, which is equivalent to NaN. For more information about the behaviors of NaN, see the description for the global property.
Number.NaN
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Value
The number value NaN.
Property attributes of Number.NaN |
|
|---|---|
| Writable | no |
| Enumerable | no |
| Configurable | no |
Description
Because NaN is a static property of Number, you always use it as Number.NaN, rather than as a property of a number value.
Examples
Checking whether values are numeric
js
function sanitize(x) {
if (isNaN(x)) {
return Number.NaN;
}
return x;
}
Specifications
| Specification |
|---|
| ECMAScript Language Specification # sec-number.nan |
Browser compatibility
| Desktop | Mobile | Server | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | Deno | Node.js | ||
NaN |
1 | 12 | 1 | 3 | 1 | 18 | 4 | 10.1 | 1 | 1.0 | 4.4 | 1.0 | 0.10.0 | |
See also
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/NaN