131 lines
2.8 KiB
Markdown
131 lines
2.8 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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# inheritedProperties
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> Return an array of an object's inherited property names and [symbols][@stdlib/symbol/ctor].
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<section class="usage">
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## Usage
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```javascript
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var inheritedProperties = require( '@stdlib/utils/inherited-properties' );
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```
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#### inheritedProperties( obj\[, level] )
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Returns an `array` of an object's inherited property names and [symbols][@stdlib/symbol/ctor].
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```javascript
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var props = inheritedProperties( [ 1, 2, 3 ] );
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// returns [...]
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```
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By default, the function walks an object's entire prototype chain. To limit the inheritance level, provide a `level` argument.
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```javascript
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var props = inheritedProperties( [ 1, 2, 3 ], 1 );
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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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</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 hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' );
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var Symbol = require( '@stdlib/symbol/ctor' );
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var defineProperty = require( '@stdlib/utils/define-property' );
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var inheritedProperties = require( '@stdlib/utils/inherited-properties' );
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var hasSymbols;
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var props;
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var obj;
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hasSymbols = hasSymbolSupport();
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function Foo() {
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this.a = 'b';
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defineProperty( this, 'foo', {
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'configurable': false,
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'enumerable': false,
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'writable': false,
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'value': 'bar'
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});
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if ( hasSymbols ) {
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this[ Symbol( 'a' ) ] = 'b';
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defineProperty( this, 'beep', {
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'configurable': false,
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'enumerable': false,
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'writable': false,
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'value': 'boop'
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});
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}
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return this;
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}
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Foo.prototype.c = 'd';
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defineProperty( Foo.prototype, 'bip', {
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'configurable': false,
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'enumerable': false,
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'writable': false,
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'value': 'bap'
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});
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if ( hasSymbols ) {
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Foo.prototype[ Symbol( 'c' ) ] = 'd';
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defineProperty( Foo.prototype, Symbol( 'e' ), {
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'configurable': false,
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'enumerable': false,
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'writable': false,
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'value': 'f'
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});
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}
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obj = new Foo();
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props = inheritedProperties( obj );
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console.log( props );
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// => [ ..., 'c', 'bip', ... ]
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```
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</section>
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<!-- /.examples -->
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<section class="links">
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[@stdlib/symbol/ctor]: https://www.npmjs.com/package/@stdlib/symbol-ctor
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</section>
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<!-- /.links -->
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