npm package: @stdlib/constants-float64-num-bytes
Description: Size (in bytes) of a double-precision floating-point number.
Author: The Stdlib Authors
Latest version: 0.2.3

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# FLOAT64_NUM_BYTES

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Size (in bytes) of a [double-precision floating-point number][ieee754].

<section class="installation">

## Installation

```bash
npm install @stdlib/constants-float64-num-bytes
```

</section>

<section class="usage">

## Usage

```javascript
var FLOAT64_NUM_BYTES = require( '@stdlib/constants-float64-num-bytes' );
```

#### FLOAT64_NUM_BYTES

Size (in bytes) of a [double-precision floating-point number][ieee754].

```javascript
var bool = ( FLOAT64_NUM_BYTES === 8 );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- TODO: better example -->

<!-- eslint no-undef: "error" -->

```javascript
var FLOAT64_NUM_BYTES = require( '@stdlib/constants-float64-num-bytes' );

console.log( FLOAT64_NUM_BYTES );
// => 8
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

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<section class="intro">

</section>

<!-- /.intro -->

<!-- C usage documentation. -->

<section class="usage">

### Usage

```c
#include "stdlib/constants/float64/num_bytes.h"
```

#### STDLIB_CONSTANT_FLOAT64_NUM_BYTES

Macro for the size (in bytes) of a [double-precision floating-point number][ieee754].

</section>

<!-- /.usage -->

<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

</section>

<!-- /.notes -->

<!-- C API usage examples. -->

<section class="examples">

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/constants-float16/num-bytes`][@stdlib/constants/float16/num-bytes]</span><span class="delimiter">: </span><span class="description">size (in bytes) of a half-precision floating-point number.</span>
-   <span class="package-name">[`@stdlib/constants-float32/num-bytes`][@stdlib/constants/float32/num-bytes]</span><span class="delimiter">: </span><span class="description">size (in bytes) of a single-precision floating-point number.</span>

</section>

<!-- /.related -->

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<section class="main-repo" >

* * *

## Notice

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].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/constants-float64-num-bytes/main/LICENSE

[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985

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[@stdlib/constants/float16/num-bytes]: https://www.npmjs.com/package/@stdlib/constants-float16-num-bytes

[@stdlib/constants/float32/num-bytes]: https://www.npmjs.com/package/@stdlib/constants-float32-num-bytes

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</section>

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