npm package: @stdlib/complex-dtype
Description: Return the data type of a complex number.
Author: The Stdlib Authors
Latest version: 0.2.3

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# dtype

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

> Return the data type of a complex number.

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</section>

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<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/complex-dtype
```

</section>

<section class="usage">

## Usage

```javascript
var dtype = require( '@stdlib/complex-dtype' );
```

#### dtype( value )

Returns the [data type][@stdlib/complex/dtypes] of a complex number.

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

var dt = dtype( new Complex128( 1.0, 2.0 ) );
// returns 'complex128'
```

If provided an argument having an unknown or unsupported [data type][@stdlib/complex/dtypes], the function returns `null`.

```javascript
var dt = dtype( 'beep' );
// returns null
```

</section>

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<section class="notes">

</section>

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<section class="examples">

## Examples

<!-- eslint-disable stdlib/new-cap-error -->

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

```javascript
var dtypes = require( '@stdlib/complex-dtypes' );
var ctors = require( '@stdlib/complex-ctors' );
var dtype = require( '@stdlib/complex-dtype' );

// Get a list of supported complex number data types:
var DTYPES = dtypes();

// For each supported data type, create a complex number and confirm its data type...
var ctor;
var dt;
var i;
for ( i = 0; i < DTYPES.length; i++ ) {
    ctor = ctors( DTYPES[ i ] );
    dt = dtype( new ctor( 1.0, 2.0 ) );
    console.log( '%s == %s => %s', DTYPES[ i ], dt, DTYPES[ i ] === dt );
}
```

</section>

<!-- /.examples -->

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* * *

## See Also

-   <span class="package-name">[`@stdlib/array-dtype`][@stdlib/array/dtype]</span><span class="delimiter">: </span><span class="description">return the data type of an array.</span>

</section>

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* * *

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

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

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

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[stdlib]: https://github.com/stdlib-js/stdlib

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[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/complex-dtype/tree/deno
[deno-readme]: https://github.com/stdlib-js/complex-dtype/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/complex-dtype/tree/umd
[umd-readme]: https://github.com/stdlib-js/complex-dtype/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/complex-dtype/tree/esm
[esm-readme]: https://github.com/stdlib-js/complex-dtype/blob/esm/README.md
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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/complex-dtype/main/LICENSE

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

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[@stdlib/array/dtype]: https://www.npmjs.com/package/@stdlib/array-dtype

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</section>

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