@stdlib/utils/writable-property-symbols-in/README.md

Standard utilities.

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# writablePropertySymbolsIn

> Return an array of an object's own and inherited writable symbol properties.

<section class="usage">

## Usage

```javascript
var writablePropertySymbolsIn = require( '@stdlib/utils/writable-property-symbols-in' );
```

#### writablePropertySymbolsIn( obj )

Returns an `array` of an object's own and inherited writable symbol properties.

```javascript
var hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' );
var Symbol = require( '@stdlib/symbol/ctor' );
var defineProperty = require( '@stdlib/utils/define-property' );

var obj = {};

if ( hasSymbolSupport() ) {
    defineProperty( obj, Symbol( 'a' ), {
        'configurable': false,
        'enumerable': false,
        'writable': true,
        'value': 'b'
    });
}

var symbols = writablePropertySymbolsIn( obj );
```

</section>

<!-- /.usage -->

<section class="notes">

## Notes

-   Property order is not guaranteed, as `object` property enumeration is not specified according to the [ECMAScript specification][ecma-262-for-in]. In practice, however, most engines use insertion order to sort an `object`'s properties, thus allowing for deterministic extraction.

</section>

<!-- /.notes -->

<section class="examples">

## Examples

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

```javascript
var defineProperty = require( '@stdlib/utils/define-property' );
var hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' );
var Symbol = require( '@stdlib/symbol/ctor' );
var writablePropertySymbolsIn = require( '@stdlib/utils/writable-property-symbols-in' );

var hasSymbols = hasSymbolSupport();
var symbols;
var obj;

function Foo() {
    if ( hasSymbols ) {
        defineProperty( this, Symbol( 'baz' ), {
            'configurable': false,
            'enumerable': false,
            'writable': true,
            'value': 'qux'
        });
    }
    return this;
}

if ( hasSymbols ) {
    defineProperty( Foo.prototype, Symbol( 'bip' ), {
        'configurable': false,
        'enumerable': false,
        'writable': true,
        'value': 'bop'
    });
}

obj = new Foo();
symbols = writablePropertySymbolsIn( obj );

console.log( symbols );
```

</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/utils/inherited-writable-property-symbols`][@stdlib/utils/inherited-writable-property-symbols]</span><span class="delimiter">: </span><span class="description">return an array of an object's inherited writable symbol properties.</span>
-   <span class="package-name">[`@stdlib/utils/writable-properties-in`][@stdlib/utils/writable-properties-in]</span><span class="delimiter">: </span><span class="description">return an array of an object's own and inherited writable property names and symbols.</span>
-   <span class="package-name">[`@stdlib/utils/writable-property-names-in`][@stdlib/utils/writable-property-names-in]</span><span class="delimiter">: </span><span class="description">return an array of an object's own and inherited writable property names.</span>
-   <span class="package-name">[`@stdlib/utils/writable-property-symbols`][@stdlib/utils/writable-property-symbols]</span><span class="delimiter">: </span><span class="description">return an array of an object's own writable symbol properties.</span>
-   <span class="package-name">[`@stdlib/utils/property-symbols-in`][@stdlib/utils/property-symbols-in]</span><span class="delimiter">: </span><span class="description">return an array of an object's own and inherited symbol properties.</span>

</section>

<!-- /.related -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="links">

[ecma-262-for-in]: https://262.ecma-international.org/5.1/#sec-12.6.4

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

[@stdlib/utils/inherited-writable-property-symbols]: https://github.com/stdlib-js/utils/tree/main/inherited-writable-property-symbols

[@stdlib/utils/writable-properties-in]: https://github.com/stdlib-js/utils/tree/main/writable-properties-in

[@stdlib/utils/writable-property-names-in]: https://github.com/stdlib-js/utils/tree/main/writable-property-names-in

[@stdlib/utils/writable-property-symbols]: https://github.com/stdlib-js/utils/tree/main/writable-property-symbols

[@stdlib/utils/property-symbols-in]: https://github.com/stdlib-js/utils/tree/main/property-symbols-in

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

</section>

<!-- /.links -->