npm package: @stdlib/array-base-rekey
Description: Copy and rename specified keys for every element in a provided array.
Author: The Stdlib Authors
Latest version: 0.1.1

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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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# rekey

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

> Copy and rename specified keys for every element in a provided array.

<section class="installation">

## Installation

```bash
npm install @stdlib/array-base-rekey
```

</section>

<section class="usage">

## Usage

```javascript
var rekey = require( '@stdlib/array-base-rekey' );
```

#### rekey( arr, mapping )

Copies and renames specified keys for every element in a provided array.

```javascript
var x = [
    {
        'x': 1,
        'y': 2
    },
    {
        'x': 3,
        'y': 4
    }
];
var mapping = {
    'x': 'a',
    'y': 'b'
};

var out = rekey( x, mapping );
// returns [ { 'a': 1, 'b': 2 }, { 'a': 3, 'b': 4 } ]
```

The function has the following parameters:

-   **arr**: input array.
-   **mapping**: object mapping existing keys to new key names.

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   The function **only** copies and renames those keys which are present in a provided mapping object. Any keys which are **not** present in the provided mapping object, but are present in the original objects, are **omitted** during object creation.
-   The function assumes that each object has the keys specified in a provided mapping object.
-   The function performs **shallow** copies of key values.

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var filledBy = require( '@stdlib/array-base-filled-by' );
var rekey = require( '@stdlib/array-base-rekey' );

function clbk( idx ) {
    return {
        'x': idx,
        'y': discreteUniform( 0, 10 )
    };
}

var x = filledBy( 10, clbk );
var mapping = {
    'x': 'a',
    'y': 'b'
};

var out = rekey( x, mapping );
// returns [...]
```

</section>

<!-- /.examples -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

</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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[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/array-base-rekey/tree/deno
[deno-readme]: https://github.com/stdlib-js/array-base-rekey/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/array-base-rekey/tree/umd
[umd-readme]: https://github.com/stdlib-js/array-base-rekey/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/array-base-rekey/tree/esm
[esm-readme]: https://github.com/stdlib-js/array-base-rekey/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/array-base-rekey/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/array-base-rekey/main/LICENSE

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