Wrap a function and casts a function's return value to a complex number.
npm install @stdlib/complex-base-cast-returnWe believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js. The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases. When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there. To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!
About stdlib...
[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url]
> Wrap a function and cast a function's return value to a complex number.
``bash`
npm install @stdlib/complex-base-cast-return
`javascript`
var castReturn = require( '@stdlib/complex-base-cast-return' );
#### castReturn( fcn, nargs, ctor )
Returns a function which wraps a function and casts a function's return value to a complex number.
`javascript
var Complex64 = require( '@stdlib/complex-float32-ctor' );
var addf = require( '@stdlib/number-float32-base-add' );
var f = castReturn( addf, 2, Complex64 );
// returns
`
The function accepts the following arguments:
- fcn: the function to wrap.
- nargs: the number of arguments to be provided to the wrapped function.
- ctor: complex number constructor for converting real numbers to complex numbers.
- The returned function assumes that the wrapped function returns either a real or complex number.
- The returned function assumes that, if a return value is non-numeric (i.e., not of type number), then the return value is a complex number. The returned function does not verify that non-numeric return values are, in fact, complex number objects. The returned function returns non-numeric return values from the wrapped function without modification.
`javascript
var Complex64 = require( '@stdlib/complex-float32-ctor' );
var addf = require( '@stdlib/number-float32-base-add' );
var castReturn = require( '@stdlib/complex-base-cast-return' );
var f = castReturn( addf, 2, Complex64 );
// ...
var z = f( 3.0, 4.0 );
// returns
console.log( z.toString() );
// => '7 + 0i'
`
*
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]
---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
[npm-image]: http://img.shields.io/npm/v/@stdlib/complex-base-cast-return.svg
[npm-url]: https://npmjs.org/package/@stdlib/complex-base-cast-return
[test-image]: https://github.com/stdlib-js/complex-base-cast-return/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/complex-base-cast-return/actions/workflows/test.yml?query=branch:v0.2.3
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/complex-base-cast-return/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/complex-base-cast-return?branch=main
[chat-image]: https://img.shields.io/badge/zulip-join_chat-brightgreen.svg
[chat-url]: https://stdlib.zulipchat.com
[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/complex-base-cast-return/tree/deno
[deno-readme]: https://github.com/stdlib-js/complex-base-cast-return/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/complex-base-cast-return/tree/umd
[umd-readme]: https://github.com/stdlib-js/complex-base-cast-return/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/complex-base-cast-return/tree/esm
[esm-readme]: https://github.com/stdlib-js/complex-base-cast-return/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/complex-base-cast-return/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/complex-base-cast-return/main/LICENSE