213 lines
6.5 KiB
Markdown
213 lines
6.5 KiB
Markdown
<!--
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@license Apache-2.0
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Copyright (c) 2018 The Stdlib Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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# propertyNames
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[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->
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> Return an array of an object's own enumerable and non-enumerable property names.
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<section class="installation">
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## Installation
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```bash
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npm install @stdlib/utils-property-names
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```
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</section>
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<section class="usage">
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## Usage
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```javascript
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var propertyNames = require( '@stdlib/utils-property-names' );
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```
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#### propertyNames( obj )
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Returns an `array` of an object's own enumerable and non-enumerable property names.
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```javascript
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var obj = {
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'a': 1,
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'b': 2
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};
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var keys = propertyNames( obj );
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// e.g., returns [ 'a', 'b' ]
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```
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</section>
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<!-- /.usage -->
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<section class="notes">
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## Notes
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- Name order is not guaranteed, as `object` key 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 keys, thus allowing for deterministic extraction.
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- In contrast to the built-in `Object.getOwnPropertyNames()`, if provided `null` or `undefined`, the function returns an empty `array`, rather than throwing an error.
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</section>
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<!-- /.notes -->
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<section class="examples">
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## Examples
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<!-- eslint no-undef: "error" -->
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```javascript
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var defineProperty = require( '@stdlib/utils-define-property' );
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var propertyNames = require( '@stdlib/utils-property-names' );
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function Foo() {
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this.beep = 'boop';
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this.a = {
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'b': 'c'
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};
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defineProperty( this, 'baz', {
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'value': 'qux',
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'configurable': true,
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'writable': true,
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'enumerable': false
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});
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return this;
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}
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Foo.prototype.foo = [ 'bar' ];
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var obj = new Foo();
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var keys = propertyNames( obj );
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console.log( keys );
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// e.g., => [ 'beep', 'a', 'baz' ]
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```
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</section>
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<!-- /.examples -->
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<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
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<section class="related">
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* * *
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## See Also
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- <span class="package-name">[`@stdlib/utils/keys`][@stdlib/utils/keys]</span><span class="delimiter">: </span><span class="description">return an array of an object's own enumerable property names.</span>
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- <span class="package-name">[`@stdlib/utils/nonenumerable-property-names`][@stdlib/utils/nonenumerable-property-names]</span><span class="delimiter">: </span><span class="description">return an array of an object's own non-enumerable property names.</span>
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- <span class="package-name">[`@stdlib/utils/property-names-in`][@stdlib/utils/property-names-in]</span><span class="delimiter">: </span><span class="description">return an array of an object's own and inherited enumerable and non-enumerable property names.</span>
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- <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>
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</section>
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<!-- /.related -->
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<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="main-repo" >
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* * *
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## Notice
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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.
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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].
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#### Community
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[![Chat][chat-image]][chat-url]
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---
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## License
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See [LICENSE][stdlib-license].
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## Copyright
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Copyright © 2016-2022. The Stdlib [Authors][stdlib-authors].
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</section>
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<!-- /.stdlib -->
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<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
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<section class="links">
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[npm-image]: http://img.shields.io/npm/v/@stdlib/utils-property-names.svg
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[npm-url]: https://npmjs.org/package/@stdlib/utils-property-names
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[test-image]: https://github.com/stdlib-js/utils-property-names/actions/workflows/test.yml/badge.svg
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[test-url]: https://github.com/stdlib-js/utils-property-names/actions/workflows/test.yml
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[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/utils-property-names/main.svg
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[coverage-url]: https://codecov.io/github/stdlib-js/utils-property-names?branch=main
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<!--
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[dependencies-image]: https://img.shields.io/david/stdlib-js/utils-property-names.svg
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[dependencies-url]: https://david-dm.org/stdlib-js/utils-property-names/main
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-->
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[umd]: https://github.com/umdjs/umd
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[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
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[deno-url]: https://github.com/stdlib-js/utils-property-names/tree/deno
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[umd-url]: https://github.com/stdlib-js/utils-property-names/tree/umd
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[esm-url]: https://github.com/stdlib-js/utils-property-names/tree/esm
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[chat-image]: https://img.shields.io/gitter/room/stdlib-js/stdlib.svg
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[chat-url]: https://gitter.im/stdlib-js/stdlib/
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[stdlib]: https://github.com/stdlib-js/stdlib
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[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/utils-property-names/main/LICENSE
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[ecma-262-for-in]: http://www.ecma-international.org/ecma-262/5.1/#sec-12.6.4
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<!-- <related-links> -->
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[@stdlib/utils/keys]: https://www.npmjs.com/package/@stdlib/utils-keys
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[@stdlib/utils/nonenumerable-property-names]: https://www.npmjs.com/package/@stdlib/utils-nonenumerable-property-names
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[@stdlib/utils/property-names-in]: https://www.npmjs.com/package/@stdlib/utils-property-names-in
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[@stdlib/utils/property-symbols]: https://www.npmjs.com/package/@stdlib/utils-property-symbols
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<!-- </related-links> -->
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</section>
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<!-- /.links -->
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