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

Standard utilities.

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# writablePropertySymbols

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

<section class="usage">

## Usage

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

#### writablePropertySymbols( obj )

Returns an `array` of an object's own 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 = writablePropertySymbols( 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 hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' );
var Symbol = require( '@stdlib/symbol/ctor' );
var writablePropertySymbols = require( '@stdlib/utils/writable-property-symbols' );

var hasSymbols = hasSymbolSupport();

function Foo() {
    if ( hasSymbols ) {
        this[ Symbol( 'baz' ) ] = 'qux';
    }
    return this;
}

if ( hasSymbols ) {
    Foo.prototype[ Symbol( 'bip' ) ] = 'bop';
}

var obj = new Foo();
var symbols = writablePropertySymbols( obj );
// e.g., returns [ Symbol( 'baz' ) ]
```

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

</section>

<!-- /.related -->

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<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]: https://github.com/stdlib-js/utils/tree/main/writable-properties

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

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

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

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

</section>

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