npm package: @stdlib/assert-deep-has-own-property
Description: Test whether an object contains a nested key path.
Author: The Stdlib Authors
Latest version: 0.2.3

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</details>

# deepHasOwnProp

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

> Test whether an object contains a nested key path.

<section class="installation">

## Installation

```bash
npm install @stdlib/assert-deep-has-own-property
```

</section>

<section class="usage">

## Usage

```javascript
var deepHasOwnProp = require( '@stdlib/assert-deep-has-own-property' );
```

#### deepHasOwnProp( value, path\[, options] )

Returns a `boolean` indicating if a `value` has a specified `path`.

<!-- eslint-disable object-curly-newline, object-curly-spacing -->

```javascript
var obj = { 'a': { 'b': { 'c': 'd' } } };

var bool = deepHasOwnProp( obj, 'a.b.c' );
// returns true

bool = deepHasOwnProp( obj, 'a.b.c.d.e' );
// returns false
```

If a key path includes an `array`, specify the numeric index.

<!-- eslint-disable object-curly-newline, object-curly-spacing -->

```javascript
var arr = [
    {
        'a': [
            {
                'b': [
                    { 'c': 'd' },
                    { 'e': 'f' }
                ]
            }
        ]
    }
];

var bool = deepHasOwnProp( arr, '0.a.0.b.0.c' );
// returns true

bool = deepHasOwnProp( arr, '0.a.1.b.0.c' );
// returns false

bool = deepHasOwnProp( arr, '0.a.0.b.1.c' );
// returns false
```

The key path may be specified as either a delimited `string` or a key `array`.

<!-- eslint-disable object-curly-newline, object-curly-spacing -->

```javascript
var obj = { 'a': { 'b': { 'c': 'd' } } };

var bool = deepHasOwnProp( obj, [ 'a', 'b', 'c' ] );
// returns true
```

The function accepts the following `options`:

-   **sep**: key path separator. Default: `'.'`.

By default, the function assumes `.` separated key values. To specify an alternative separator, set the `sep` option.

<!-- eslint-disable object-curly-newline, object-curly-spacing -->

```javascript
var obj = { 'a': { 'b': { 'c': 'd' } } };

var bool = deepHasOwnProp( obj, 'a/b/c', {
    'sep': '/'
});
// returns true
```

#### deepHasOwnProp.factory( path\[, options] )

Returns a `function` which tests whether a `value` contains a nested key `path`.

```javascript
var has = deepHasOwnProp.factory( 'a/b/c', {
    'sep': '/'
});
```

#### has( value )

Returns a `boolean` indicating whether a `value` contains a nested key `path`.

<!-- eslint-disable object-curly-newline, object-curly-spacing -->

```javascript
var has = deepHasOwnProp.factory( 'a.b.c' );

var obj = { 'a': { 'b': { 'c': 'd' } } };

var bool = has( obj );
// returns true
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   Only **own** properties are tested. Paths matching inherited properties are not considered.

    ```javascript
    function Foo() {
        this.a = 'b';
        return this;
    }
    Foo.prototype.c = 'd';

    var foo = new Foo();

    var bool = deepHasOwnProp( foo, 'a' );
    // returns true

    bool = deepHasOwnProp( foo, 'c' );
    // returns false
    ```

-   When provided `null` or `undefined`, the function result is always `false`.

    ```javascript
    var bool = deepHasOwnProp( null, 'a.b.c' );
    // returns false

    bool = deepHasOwnProp( void 0, 'a.b.c' );
    // returns false
    ```

-   Property values other than `null` or `undefined` are coerced to `objects`.

    ```javascript
    var obj = {
        'a': 'b'
    };

    var bool = deepHasOwnProp( obj, 'a.length' );
    // returns true
    ```

-   Key path `array` elements are coerced to `strings`.

    ```javascript
    var obj = {
        'null': false
    };
    var bool = deepHasOwnProp( obj, [ null ] );
    // returns true

    obj = {
        '[object Object]': false
    };
    bool = deepHasOwnProp( obj, [ {} ] );
    // returns true
    ```

</section>

<!-- /.notes -->

<section class="examples">

## Examples

<!-- eslint-disable object-curly-newline, object-curly-spacing -->

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

```javascript
var deepHasOwnProp = require( '@stdlib/assert-deep-has-own-property' );

var bool = deepHasOwnProp( { 'a': { 'b': { 'c': 'd' } } }, 'a.b.c' );
// returns true

bool = deepHasOwnProp( { 'a': { 'b': { 'c': 'd' } } }, [ 'a', 'b', 'c' ] );
// returns true

bool = deepHasOwnProp( { 'a': { 'b': { 'c': 'd' } } }, 'a/b/c', {
    'sep': '/'
});
// returns true

bool = deepHasOwnProp( { 'a': { 'b': { 'c': 'd' } } }, 'a.b.c.d' );
// returns false

bool = deepHasOwnProp( { 'a': [ { 'b': { 'c': 'd' } } ] }, [ 'a', '0', 'b', 'c', 'd' ] );
// returns false

bool = deepHasOwnProp( { 'a': { 'b': { 'c': 'd' } } }, 'a/b/c/d/e', {
    'sep': '/'
});
// returns false

// Create a customized function:
var has = deepHasOwnProp.factory( 'a_b_c', {
    'sep': '_'
});

bool = has( { 'a': { 'b': { 'c': 'd' } } } );
// returns true

bool = has( { 'a': [ { 'b': { 'c': 'd' } } ] } );
// returns false
```

</section>

<!-- /.examples -->

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

<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/assert-deep-has-property`][@stdlib/assert/deep-has-property]</span><span class="delimiter">: </span><span class="description">test whether an object contains a nested key path, either own or inherited.</span>
-   <span class="package-name">[`@stdlib/assert-has-own-property`][@stdlib/assert/has-own-property]</span><span class="delimiter">: </span><span class="description">test if an object has a specified property.</span>
-   <span class="package-name">[`@stdlib/object-deep-get`][@stdlib/object/deep-get]</span><span class="delimiter">: </span><span class="description">get a nested property value.</span>
-   <span class="package-name">[`@stdlib/utils-deep-pluck`][@stdlib/utils/deep-pluck]</span><span class="delimiter">: </span><span class="description">extract a nested property value from each element of an object array.</span>
-   <span class="package-name">[`@stdlib/object-deep-set`][@stdlib/object/deep-set]</span><span class="delimiter">: </span><span class="description">set a nested property value.</span>

</section>

<!-- /.related -->

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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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<!-- <related-links> -->

[@stdlib/assert/deep-has-property]: https://www.npmjs.com/package/@stdlib/assert-deep-has-property

[@stdlib/assert/has-own-property]: https://www.npmjs.com/package/@stdlib/assert-has-own-property

[@stdlib/object/deep-get]: https://www.npmjs.com/package/@stdlib/object-deep-get

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