106 lines
2.3 KiB
Markdown
106 lines
2.3 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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# propertyDescriptorIn
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> Return a property descriptor for an object's own or inherited property.
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<section class="usage">
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## Usage
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```javascript
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var propertyDescriptorIn = require( '@stdlib/utils/property-descriptor-in' );
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```
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#### propertyDescriptorIn( obj, property )
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Returns a property descriptor for an object's own or inherited property.
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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 desc = propertyDescriptorIn( obj, 'a' );
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// returns {'configurable':true,'enumerable':true,'writable':true,'value':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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## Notes
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- This function differs from the built-in `Object.getOwnPropertyDescriptor()` as follows:
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- If provided `null` or `undefined`, the function returns `null`, rather than throwing an error.
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- If an object does not have a provided property, the function returns `null`, rather than `undefined`.
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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 propertyDescriptorIn = require( '@stdlib/utils/property-descriptor-in' );
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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 desc = propertyDescriptorIn( obj, 'foo' );
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console.log( desc );
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// => {'configurable':true,'enumerable':true,'writable':true,'value':['bar']}
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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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</section>
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<!-- /.links -->
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