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https://github.com/stdlib-js/assert-is-data-property-in

Test if an object's own or inherited property has a data descriptor.
https://github.com/stdlib-js/assert-is-data-property-in

assert assertion has in inherited is javascript node node-js nodejs obj object own proto prototype stdlib util utilities utility utils

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Test if an object's own or inherited property has a data descriptor.

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README 

        



  

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# isDataPropertyIn



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



> Test if an object's own or inherited property has a data descriptor.



## Installation



```bash

npm install @stdlib/assert-is-data-property-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 isDataPropertyIn = require( '@stdlib/assert-is-data-property-in' );

```



#### isDataPropertyIn( value, property )



Returns a `boolean` indicating if a `value` has a data `property` (either own or inherited).



```javascript

var defineProperty = require( '@stdlib/utils-define-property' );



var bool;

var obj;



function Foo() {

    this.foo = 'bar';

    return this;

}



defineProperty( Foo.prototype, 'beep', {

    'configurable': false,

    'enumerable': false,

    'writable': false,

    'value': 'boop'

});



defineProperty( Foo.prototype, 'accessor', {

    'configurable': false,

    'enumerable': false,

    'get': function getter() {

        return obj.foo;

    },

    'set': function setter( v ) {

        obj.foo = v;

    }

});



obj = new Foo();



bool = isDataPropertyIn( obj, 'foo' );

// returns true



bool = isDataPropertyIn( obj, 'beep' );

// returns true



bool = isDataPropertyIn( obj, 'accessor' );

// returns false

```



## Notes



-   Value arguments other than `null` or `undefined` are coerced to `objects`.



    ```javascript

    var bool = isDataPropertyIn( 'beep', 'length' );

    // returns true

    ```



-   Non-symbol property arguments are coerced to `strings`.



    ```javascript

    var obj = {

        'null': 'foo'

    };



    var bool = isDataPropertyIn( obj, null );

    // returns true

    ```



## Examples



```javascript

var isDataPropertyIn = require( '@stdlib/assert-is-data-property-in' );



var bool = isDataPropertyIn( [ 'a' ], 'length' );

// returns true



bool = isDataPropertyIn( { 'a': 'b' }, 'a' );

// returns true



bool = isDataPropertyIn( [ 'a' ], 0 );

// returns true



bool = isDataPropertyIn( { 'null': false }, null );

// returns true



bool = isDataPropertyIn( { '[object Object]': false }, {} );

// returns true



bool = isDataPropertyIn( {}, 'toString' );

// returns true



bool = isDataPropertyIn( {}, 'hasOwnProperty' );

// returns true



bool = isDataPropertyIn( null, 'a' );

// returns false



bool = isDataPropertyIn( void 0, 'a' );

// returns false

```



* * *



## See Also



-   [`@stdlib/assert-has-property`][@stdlib/assert/has-property]: test if an object has a specified property, either own or inherited.

-   [`@stdlib/assert-is-accessor-property-in`][@stdlib/assert/is-accessor-property-in]: test if an object's own or inherited property has an accessor descriptor.

-   [`@stdlib/assert-is-data-property`][@stdlib/assert/is-data-property]: test if an object's own property has a data descriptor.



* * *



## 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/assert-is-data-property-in.svg

[npm-url]: https://npmjs.org/package/@stdlib/assert-is-data-property-in



[test-image]: https://github.com/stdlib-js/assert-is-data-property-in/actions/workflows/test.yml/badge.svg?branch=main

[test-url]: https://github.com/stdlib-js/assert-is-data-property-in/actions/workflows/test.yml?query=branch:main



[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/assert-is-data-property-in/main.svg

[coverage-url]: https://codecov.io/github/stdlib-js/assert-is-data-property-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/assert-is-data-property-in/tree/deno

[deno-readme]: https://github.com/stdlib-js/assert-is-data-property-in/blob/deno/README.md

[umd-url]: https://github.com/stdlib-js/assert-is-data-property-in/tree/umd

[umd-readme]: https://github.com/stdlib-js/assert-is-data-property-in/blob/umd/README.md

[esm-url]: https://github.com/stdlib-js/assert-is-data-property-in/tree/esm

[esm-readme]: https://github.com/stdlib-js/assert-is-data-property-in/blob/esm/README.md

[branches-url]: https://github.com/stdlib-js/assert-is-data-property-in/blob/main/branches.md



[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/assert-is-data-property-in/main/LICENSE



[@stdlib/assert/has-property]: https://github.com/stdlib-js/assert-has-property



[@stdlib/assert/is-accessor-property-in]: https://github.com/stdlib-js/assert-is-accessor-property-in



[@stdlib/assert/is-data-property]: https://github.com/stdlib-js/assert-is-data-property