npm package: @stdlib/strided-base-unary-signature-callbacks
Description: Assign callbacks to unary interfaces according to type promotion rules.
Author: The Stdlib Authors
Latest version: 0.2.3

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# Callbacks

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

> Assign callbacks to unary interfaces according to type [promotion rules][@stdlib/ndarray/promotion-rules].

<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->

<section class="intro">

</section>

<!-- /.intro -->

<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/strided-base-unary-signature-callbacks
```

</section>

<section class="usage">

## Usage

```javascript
var callbacks = require( '@stdlib/strided-base-unary-signature-callbacks' );
```

#### callbacks( table, signatures )

Assigns callbacks to unary interfaces according to type [promotion rules][@stdlib/ndarray/promotion-rules].

```javascript
var signatures = require( '@stdlib/strided-base-unary-dtype-signatures' );
var identity = require( '@stdlib/number-float64-base-identity' );
var cidentity = require( '@stdlib/complex-float64-base-identity' );
var cidentityf = require( '@stdlib/complex-float32-base-identity' );

var dtypes = [
    'float64',
    'float32',
    'int32',
    'uint8'
];

var sigs = signatures( dtypes, dtypes );
// returns [...]

var table = {
    'default': identity,
    'complex64': cidentityf,
    'complex128': cidentity
};

var list = callbacks( table, sigs );
// returns [...]
```

The function accepts the following arguments:

-   **table**: callback table.
-   **signatures**: strided array containing unary interface signatures.

A callback `table` should have the following properties:

-   **default**: default callback.
-   **complex64**: callback for single-precision complex floating-point numbers.
-   **complex128**: callback for double-precision complex floating-point numbers.

</section>

<!-- /.usage -->

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

<section class="notes">

## Notes

-   The function assumes that the provided signature array has the following properties:

    -   a strided array having a stride length of `2` (i.e., every `2` elements define a unary interface signature).
    -   for each signature (i.e., set of two consecutive non-overlapping strided array elements), the first element is the input data type and the second element is the return data type.
    -   all signatures follow type [promotion rules][@stdlib/ndarray/promotion-rules].

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

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

```javascript
var dtypes = require( '@stdlib/strided-dtypes' );
var signatures = require( '@stdlib/strided-base-unary-dtype-signatures' );
var identity = require( '@stdlib/number-float64-base-identity' );
var cidentity = require( '@stdlib/complex-float64-base-identity' );
var cidentityf = require( '@stdlib/complex-float32-base-identity' );
var callbacks = require( '@stdlib/strided-base-unary-signature-callbacks' );

// Get the list of supported strided array data types:
var dt = dtypes();

// Generate unary interface signatures:
var sigs = signatures( dt, dt );

// Define a callback table:
var table = {
    'default': identity,
    'complex64': cidentityf,
    'complex128': cidentity
};

// Generate a list of callbacks according to type promotion rules:
var clbks = callbacks( table, sigs );
// returns [...]
```

</section>

<!-- /.examples -->

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<section class="references">

</section>

<!-- /.references -->

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<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/strided-base/unary-dtype-signatures`][@stdlib/strided/base/unary-dtype-signatures]</span><span class="delimiter">: </span><span class="description">generate a list of unary interface signatures from strided array data types.</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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[umd]: https://github.com/umdjs/umd
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[@stdlib/ndarray/promotion-rules]: https://www.npmjs.com/package/@stdlib/ndarray-promotion-rules

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