npm package: @stdlib/utils-map-function
Description: Invoke a function n times and return an array of accumulated function return values.
Author: The Stdlib Authors
Latest version: 0.2.3

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<details>
  <summary>
    About stdlib...
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  <p>We 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.</p>
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# mapFun

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

> Invoke a function `n` times and return an array of accumulated function return values.

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<section class="intro">

</section>

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<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/utils-map-function
```

</section>

<section class="usage">

## Usage

```javascript
var mapFun = require( '@stdlib/utils-map-function' );
```

#### mapFun( fcn, n\[, thisArg ] )

Invokes a function `n` times and returns an `array` of accumulated function return values.

```javascript
function fcn( i ) {
    return i;
}

var arr = mapFun( fcn, 5 );
// returns [ 0, 1, 2, 3, 4 ]
```

To set the function execution context, provide a `thisArg`.

```javascript
function fcn( i ) {
    this.count += 1;
    return i;
}

var context = {
    'count': 0
};

var arr = mapFun( fcn, 5, context );
// returns [ 0, 1, 2, 3, 4 ]

console.log( context.count );
// => 5
```

</section>

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<!-- 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 invoked `function` is provided a single argument: the invocation index (zero-based).

</section>

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<!-- Package usage examples. -->

<section class="examples">

## Examples

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

```javascript
var randu = require( '@stdlib/random-base-randu' );
var mapFun = require( '@stdlib/utils-map-function' );

function rand( i ) {
    return randu() * i * 10.0;
}

var arr = mapFun( rand, 100 );
console.log( arr );
```

</section>

<!-- /.examples -->

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* * *

## See Also

-   <span class="package-name">[`@stdlib/utils-async/map-function`][@stdlib/utils/async/map-function]</span><span class="delimiter">: </span><span class="description">invoke a function n times and return an array of accumulated function return values.</span>

</section>

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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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[npm-url]: https://npmjs.org/package/@stdlib/utils-map-function

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[test-url]: https://github.com/stdlib-js/utils-map-function/actions/workflows/test.yml?query=branch:v0.2.3

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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/utils-map-function/tree/deno
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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/utils-map-function/main/LICENSE

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[@stdlib/utils/async/map-function]: https://www.npmjs.com/package/@stdlib/utils-async-map-function

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