Number.NaN

The Number.NaN property represents Not-A-Number. Equivalent of NaN.

You do not have to create a Number object to access this static property (use Number.NaN).

Property attributes of `Number.NaN`
Writable	no
Enumerable	no
Configurable	no

Examples

function sanitize(x) {
  if (isNaN(x)) {
    return Number.NaN;
  }
  return x;
}

See Testing against NaN on the NaN page.

Specification
ECMAScript Language Specification # sec-number.nan

	desktop						mobile						server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	Deno	Node.js
`NaN`	ChromeFull support1	EdgeFull support12	FirefoxFull support1	Internet ExplorerFull support4	OperaFull support3	SafariFull support1	WebView AndroidFull support1	Chrome AndroidFull support18	Firefox for AndroidFull support4	Opera AndroidFull support10.1	Safari on iOSFull support1	Samsung InternetFull support1.0	DenoFull support1.0	Node.jsFull support0.10.0