Return an array of an object's own non-enumerable symbol properties.
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> Return an array of an object's own non-enumerable symbol properties.
``bash`
npm install @stdlib/utils-nonenumerable-property-symbols
`javascript`
var nonEnumerablePropertySymbols = require( '@stdlib/utils-nonenumerable-property-symbols' );
#### nonEnumerablePropertySymbols( obj )
Returns an array of an object's own non-enumerable 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 = nonEnumerablePropertySymbols( obj );
`
- 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.
`javascript
var defineProperty = require( '@stdlib/utils-define-property' );
var hasSymbolSupport = require( '@stdlib/assert-has-symbol-support' );
var Symbol = require( '@stdlib/symbol-ctor' );
var nonEnumerablePropertySymbols = require( '@stdlib/utils-nonenumerable-property-symbols' );
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': false,
'value': 'bop'
});
}
obj = new Foo();
symbols = nonEnumerablePropertySymbols( obj );
console.log( symbols );
`
*
- [@stdlib/utils-enumerable-property-symbols][@stdlib/utils/enumerable-property-symbols]: return an array of an object's own enumerable symbol properties.
- [@stdlib/utils-inherited-nonenumerable-property-symbols][@stdlib/utils/inherited-nonenumerable-property-symbols]: return an array of an object's inherited non-enumerable symbol properties.
- [@stdlib/utils-nonenumerable-property-names][@stdlib/utils/nonenumerable-property-names]: return an array of an object's own non-enumerable property names.
- [@stdlib/utils-nonenumerable-property-symbols-in][@stdlib/utils/nonenumerable-property-symbols-in]: return an array of an object's own and inherited non-enumerable symbol properties.
- [@stdlib/utils-property-symbols][@stdlib/utils/property-symbols]: return an array of an object's own symbol properties.
*
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]
---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[test-image]: https://github.com/stdlib-js/utils-nonenumerable-property-symbols/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/utils-nonenumerable-property-symbols/actions/workflows/test.yml?query=branch:v0.2.3
[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/utils-nonenumerable-property-symbols/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/utils-nonenumerable-property-symbols?branch=main
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[stdlib]: https://github.com/stdlib-js/stdlib
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[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/utils-nonenumerable-property-symbols/tree/deno
[deno-readme]: https://github.com/stdlib-js/utils-nonenumerable-property-symbols/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/utils-nonenumerable-property-symbols/tree/umd
[umd-readme]: https://github.com/stdlib-js/utils-nonenumerable-property-symbols/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/utils-nonenumerable-property-symbols/tree/esm
[esm-readme]: https://github.com/stdlib-js/utils-nonenumerable-property-symbols/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/utils-nonenumerable-property-symbols/blob/main/branches.md
[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/utils-nonenumerable-property-symbols/main/LICENSE
[ecma-262-for-in]: https://262.ecma-international.org/5.1/#sec-12.6.4
[@stdlib/utils/enumerable-property-symbols]: https://www.npmjs.com/package/@stdlib/utils-enumerable-property-symbols
[@stdlib/utils/inherited-nonenumerable-property-symbols]: https://www.npmjs.com/package/@stdlib/utils-inherited-nonenumerable-property-symbols
[@stdlib/utils/nonenumerable-property-names]: https://www.npmjs.com/package/@stdlib/utils-nonenumerable-property-names
[@stdlib/utils/nonenumerable-property-symbols-in]: https://www.npmjs.com/package/@stdlib/utils-nonenumerable-property-symbols-in
[@stdlib/utils/property-symbols]: https://www.npmjs.com/package/@stdlib/utils-property-symbols