Double-precision floating-point NaN.
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> [Double-precision floating-point][ieee754] NaN.
``bash`
npm install @stdlib/constants-float64-nan
`javascript`
var FLOAT64_NAN = require( '@stdlib/constants-float64-nan' );
#### FLOAT64_NAN
[Double-precision floating-point][ieee754] NaN.
`javascript`
var bool = ( FLOAT64_NAN !== FLOAT64_NAN );
// returns true
`javascript
var FLOAT64_NAN = require( '@stdlib/constants-float64-nan' );
console.log( FLOAT64_NAN );
// => NaN
`
*
`c`
#include "stdlib/constants/float64/nan.h"
#### STDLIB_CONSTANT_FLOAT64_NAN
Macro for [double-precision floating-point][ieee754] NaN.
*
- [@stdlib/constants-float32/nan][@stdlib/constants/float32/nan]: single-precision floating-point NaN.
*
This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/constants-float64-nan/tree/deno
[deno-readme]: https://github.com/stdlib-js/constants-float64-nan/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/constants-float64-nan/tree/umd
[umd-readme]: https://github.com/stdlib-js/constants-float64-nan/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/constants-float64-nan/tree/esm
[esm-readme]: https://github.com/stdlib-js/constants-float64-nan/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/constants-float64-nan/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/constants-float64-nan/main/LICENSE
[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985
[@stdlib/constants/float32/nan]: https://www.npmjs.com/package/@stdlib/constants-float32-nan