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https://github.com/stdlib-js/utils-common-keys-in

Return the common own and inherited property names of two or more objects.
https://github.com/stdlib-js/utils-common-keys-in

common enumerable inherited javascript keys names node node-js nodejs obj object own properties props shared stdlib util utilities utility utils

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Return the common own and inherited property names of two or more objects.

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README 

        



  

    About stdlib...

  

  
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# commonKeysIn



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



> Return the common own and inherited property names of two or more objects.



## Installation



```bash

npm install @stdlib/utils-common-keys-in

```



Alternatively,



-   To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).

-   If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).

-   For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).



The [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships.



To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.



## Usage



```javascript

var commonKeysIn = require( '@stdlib/utils-common-keys-in' );

```



#### commonKeysIn( obj1, obj2\[, obj3\[,...,objN]] )



Returns the common own and inherited property names of two or more objects.



```javascript

var obj = {

    'a': 1,

    'b': 2,

    'c': 3

};



var obj2 = {

    'a': 1,

    'b': 2

};



var keys = commonKeysIn( obj, obj2 );

// returns [ 'a', 'b' ]

```



## Examples



```javascript

var commonKeysIn = require( '@stdlib/utils-common-keys-in' );



function Foo() {

    this.beep = 'boop';

    this.a = {

        'b': 'c'

    };

    return this;

}



Foo.prototype.foo = [ 'bar' ];



var obj1 = new Foo();



var obj2 = {

    'beep': 'boop',

    'foo': 'bar'

};



var keys = commonKeysIn( obj1, obj2 );

// returns [ 'beep', 'foo' ]

```



* * *



## 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 © 2016-2024. The Stdlib [Authors][stdlib-authors].



[npm-image]: http://img.shields.io/npm/v/@stdlib/utils-common-keys-in.svg

[npm-url]: https://npmjs.org/package/@stdlib/utils-common-keys-in



[test-image]: https://github.com/stdlib-js/utils-common-keys-in/actions/workflows/test.yml/badge.svg?branch=main

[test-url]: https://github.com/stdlib-js/utils-common-keys-in/actions/workflows/test.yml?query=branch:main



[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/utils-common-keys-in/main.svg

[coverage-url]: https://codecov.io/github/stdlib-js/utils-common-keys-in?branch=main



[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg

[chat-url]: https://app.gitter.im/#/room/#stdlib-js_stdlib:gitter.im



[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/utils-common-keys-in/tree/deno

[deno-readme]: https://github.com/stdlib-js/utils-common-keys-in/blob/deno/README.md

[umd-url]: https://github.com/stdlib-js/utils-common-keys-in/tree/umd

[umd-readme]: https://github.com/stdlib-js/utils-common-keys-in/blob/umd/README.md

[esm-url]: https://github.com/stdlib-js/utils-common-keys-in/tree/esm

[esm-readme]: https://github.com/stdlib-js/utils-common-keys-in/blob/esm/README.md

[branches-url]: https://github.com/stdlib-js/utils-common-keys-in/blob/main/branches.md



[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/utils-common-keys-in/main/LICENSE