npm package: @stdlib/assert-is-complex
Description: Test if a value is a 64-bit or 128-bit complex number.
Author: The Stdlib Authors
Latest version: 0.2.3

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<details>
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# isComplex

[![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 value is a [64-bit][@stdlib/complex/float32/ctor] or [128-bit][@stdlib/complex/float64/ctor] complex number.

<section class="installation">

## Installation

```bash
npm install @stdlib/assert-is-complex
```

</section>

<section class="usage">

## Usage

```javascript
var isComplex = require( '@stdlib/assert-is-complex' );
```

#### isComplex( value )

Tests if a value is a [64-bit][@stdlib/complex/float32/ctor] or [128-bit][@stdlib/complex/float64/ctor] complex number.

```javascript
var Complex128 = require( '@stdlib/complex-float64-ctor' );
var Complex64 = require( '@stdlib/complex-float32-ctor' );

var x = new Complex128( 1.0, 3.0 );
var bool = isComplex( x );
// returns true

x = new Complex64( 3.0, 1.0 );
bool = isComplex( x );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

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

```javascript
var Complex64 = require( '@stdlib/complex-float32-ctor' );
var Complex128 = require( '@stdlib/complex-float64-ctor' );
var isComplex = require( '@stdlib/assert-is-complex' );

var out = isComplex( new Complex64( 2.0, 2.0 ) );
// returns true

out = isComplex( new Complex128( 3.0, 1.0 ) );
// returns true

out = isComplex( {} );
// returns false

out = isComplex( null );
// 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/assert-is-complex64`][@stdlib/assert/is-complex64]</span><span class="delimiter">: </span><span class="description">test if a value is a 64-bit complex number.</span>
-   <span class="package-name">[`@stdlib/assert-is-complex128`][@stdlib/assert/is-complex128]</span><span class="delimiter">: </span><span class="description">test if a value is a 128-bit complex number.</span>

</section>

<!-- /.related -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->


<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>

<!-- /.stdlib -->

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[npm-image]: http://img.shields.io/npm/v/@stdlib/assert-is-complex.svg
[npm-url]: https://npmjs.org/package/@stdlib/assert-is-complex

[test-image]: https://github.com/stdlib-js/assert-is-complex/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/assert-is-complex/actions/workflows/test.yml?query=branch:v0.2.3

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/assert-is-complex/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/assert-is-complex?branch=main

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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/assert-is-complex/tree/deno
[deno-readme]: https://github.com/stdlib-js/assert-is-complex/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/assert-is-complex/tree/umd
[umd-readme]: https://github.com/stdlib-js/assert-is-complex/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/assert-is-complex/tree/esm
[esm-readme]: https://github.com/stdlib-js/assert-is-complex/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/assert-is-complex/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/assert-is-complex/main/LICENSE

[@stdlib/complex/float64/ctor]: https://www.npmjs.com/package/@stdlib/complex-float64-ctor

[@stdlib/complex/float32/ctor]: https://www.npmjs.com/package/@stdlib/complex-float32-ctor

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

[@stdlib/assert/is-complex64]: https://www.npmjs.com/package/@stdlib/assert-is-complex64

[@stdlib/assert/is-complex128]: https://www.npmjs.com/package/@stdlib/assert-is-complex128

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

</section>

<!-- /.links -->