npm package: @stdlib/math-base-assert-is-negative-zero
Description: Test if a double-precision floating-point numeric value is negative zero.
Author: The Stdlib Authors
Latest version: 0.2.3

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# isNegativeZero

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

> Test if a double-precision floating-point numeric value is negative zero.

<section class="installation">

## Installation

```bash
npm install @stdlib/math-base-assert-is-negative-zero
```

</section>

<section class="usage">

## Usage

```javascript
var isNegativeZero = require( '@stdlib/math-base-assert-is-negative-zero' );
```

#### isNegativeZero( x )

Tests if a double-precision floating-point `numeric` value is negative zero.

```javascript
var bool = isNegativeZero( -0.0 );
// returns true

bool = isNegativeZero( 0.0 );
// returns false
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

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

```javascript
var isNegativeZero = require( '@stdlib/math-base-assert-is-negative-zero' );

var bool = isNegativeZero( -0.0 );
// returns true

bool = isNegativeZero( 0.0 );
// returns false

bool = isNegativeZero( 5.0 );
// returns false

bool = isNegativeZero( -1.0 );
// returns false

bool = isNegativeZero( NaN );
// returns false
```

</section>

<!-- /.examples -->

<!-- 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/math-base/assert/is-positive-zero`][@stdlib/math/base/assert/is-positive-zero]</span><span class="delimiter">: </span><span class="description">test if a double-precision floating-point numeric value is positive zero.</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].

</section>

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<!-- <related-links> -->

[@stdlib/math/base/assert/is-positive-zero]: https://www.npmjs.com/package/@stdlib/math-base-assert-is-positive-zero

<!-- </related-links> -->

</section>

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