@stdlib/assert-is-nonconfigurable-property-in/README.md

Test if an object's own or inherited property is non-configurable.

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# isNonConfigurablePropertyIn

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

> Test if an object's own or inherited property is non-configurable.

<section class="installation">

## Installation

```bash
npm install @stdlib/assert-is-nonconfigurable-property-in
```

</section>

<section class="usage">

## Usage

<!-- eslint-disable id-length -->

```javascript
var isNonConfigurablePropertyIn = require( '@stdlib/assert-is-nonconfigurable-property-in' );
```

#### isNonConfigurablePropertyIn( value, property )

Returns a `boolean` indicating if a `value` has a non-configurable `property` (i.e., a property which cannot be deleted and whose descriptor cannot be changed).

<!-- eslint-disable no-restricted-syntax, id-length -->

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

var bool;
var obj;

function Foo() {
    this.foo = 'bar';
    return this;
}

defineProperty( Foo.prototype, 'beep', {
    'configurable': true,
    'enumerable': true,
    'writable': true,
    'value': true
});

defineProperty( Foo.prototype, 'boop', {
    'configurable': false,
    'enumerable': true,
    'writable': true,
    'value': true
});

obj = new Foo();

bool = isNonConfigurablePropertyIn( obj, 'foo' );
// returns false

bool = isNonConfigurablePropertyIn( obj, 'beep' );
// returns false

bool = isNonConfigurablePropertyIn( obj, 'boop' );
// returns true
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

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

    <!-- eslint-disable id-length -->

    ```javascript
    var bool = isNonConfigurablePropertyIn( 'beep', 'length' );
    // returns true
    ```

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

    <!-- eslint-disable id-length -->

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

    var obj = {};

    defineProperty( obj, 'null', {
        'configurable': false,
        'enumerable': true,
        'writable': true,
        'value': true
    });

    var bool = isNonConfigurablePropertyIn( obj, null );
    // returns true
    ```

</section>

<!-- /.notes -->

<section class="examples">

## Examples

<!-- eslint-disable object-curly-newline, id-length -->

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

```javascript
var isNonConfigurablePropertyIn = require( '@stdlib/assert-is-nonconfigurable-property-in' );

var bool = isNonConfigurablePropertyIn( [ 'a' ], 'length' );
// returns true

bool = isNonConfigurablePropertyIn( {}, 'toString' );
// returns false

bool = isNonConfigurablePropertyIn( {}, 'hasOwnProperty' );
// returns false

bool = isNonConfigurablePropertyIn( { 'a': 'b' }, 'a' );
// returns false

bool = isNonConfigurablePropertyIn( [ 'a' ], 0 );
// returns false

bool = isNonConfigurablePropertyIn( { 'null': false }, null );
// returns false

bool = isNonConfigurablePropertyIn( { '[object Object]': false }, {} );
// returns false

bool = isNonConfigurablePropertyIn( null, 'a' );
// returns false

bool = isNonConfigurablePropertyIn( void 0, 'a' );
// 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-is-configurable-property-in`][@stdlib/assert/is-configurable-property-in]</span><span class="delimiter">: </span><span class="description">test if an object's own or inherited property is configurable.</span>
-   <span class="package-name">[`@stdlib/assert-is-enumerable-property-in`][@stdlib/assert/is-enumerable-property-in]</span><span class="delimiter">: </span><span class="description">test if an object's own or inherited property is enumerable.</span>
-   <span class="package-name">[`@stdlib/assert-is-nonconfigurable-property`][@stdlib/assert/is-nonconfigurable-property]</span><span class="delimiter">: </span><span class="description">test if an object's own property is non-configurable.</span>
-   <span class="package-name">[`@stdlib/assert-is-nonenumerable-property-in`][@stdlib/assert/is-nonenumerable-property-in]</span><span class="delimiter">: </span><span class="description">test if an object's own or inherited property is non-enumerable.</span>
-   <span class="package-name">[`@stdlib/assert-is-readable-property-in`][@stdlib/assert/is-readable-property-in]</span><span class="delimiter">: </span><span class="description">test if an object's own or inherited property is readable.</span>
-   <span class="package-name">[`@stdlib/assert-is-writable-property-in`][@stdlib/assert/is-writable-property-in]</span><span class="delimiter">: </span><span class="description">test if an object's own or inherited property is writable.</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

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---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2024. The Stdlib [Authors][stdlib-authors].

</section>

<!-- /.stdlib -->

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

[@stdlib/assert/is-configurable-property-in]: https://www.npmjs.com/package/@stdlib/assert-is-configurable-property-in

[@stdlib/assert/is-enumerable-property-in]: https://www.npmjs.com/package/@stdlib/assert-is-enumerable-property-in

[@stdlib/assert/is-nonconfigurable-property]: https://www.npmjs.com/package/@stdlib/assert-is-nonconfigurable-property

[@stdlib/assert/is-nonenumerable-property-in]: https://www.npmjs.com/package/@stdlib/assert-is-nonenumerable-property-in

[@stdlib/assert/is-readable-property-in]: https://www.npmjs.com/package/@stdlib/assert-is-readable-property-in

[@stdlib/assert/is-writable-property-in]: https://www.npmjs.com/package/@stdlib/assert-is-writable-property-in

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