145 lines
2.9 KiB
Markdown
145 lines
2.9 KiB
Markdown
<!--
|
|
|
|
@license Apache-2.0
|
|
|
|
Copyright (c) 2018 The Stdlib Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
|
|
-->
|
|
|
|
# isInheritedProperty
|
|
|
|
> Test if an object has an inherited property.
|
|
|
|
<section class="usage">
|
|
|
|
## Usage
|
|
|
|
```javascript
|
|
var isInheritedProperty = require( '@stdlib/assert/is-inherited-property' );
|
|
```
|
|
|
|
#### isInheritedProperty( value, property )
|
|
|
|
Returns a `boolean` indicating if a `value` has an inherited `property`.
|
|
|
|
```javascript
|
|
var obj = {
|
|
'beep': 'boop'
|
|
};
|
|
|
|
var bool = isInheritedProperty( obj, 'beep' );
|
|
// returns false
|
|
|
|
bool = isInheritedProperty( obj, 'hasOwnProperty' );
|
|
// returns true
|
|
|
|
bool = isInheritedProperty( obj, 'bap' );
|
|
// returns false
|
|
```
|
|
|
|
</section>
|
|
|
|
<!-- /.usage -->
|
|
|
|
<section class="notes">
|
|
|
|
## Notes
|
|
|
|
- The function does **not** throw when provided `null` or `undefined`. Instead, the function returns `false`.
|
|
|
|
```javascript
|
|
var bool = isInheritedProperty( null, 'a' );
|
|
// returns false
|
|
|
|
bool = isInheritedProperty( void 0, 'a' );
|
|
// returns false
|
|
```
|
|
|
|
- Value arguments other than `null` or `undefined` are coerced to `objects`.
|
|
|
|
```javascript
|
|
var bool = isInheritedProperty( 'beep', 'toString' );
|
|
// returns true
|
|
```
|
|
|
|
- Non-symbol property arguments are coerced to `strings`.
|
|
|
|
```javascript
|
|
function Foo() {
|
|
return this;
|
|
}
|
|
|
|
Foo.prototype.null = true;
|
|
Foo.prototype[ '[object Object]' ] = true;
|
|
|
|
var obj = new Foo();
|
|
|
|
var bool = isInheritedProperty( obj, null );
|
|
// returns true
|
|
|
|
bool = isInheritedProperty( obj, {} );
|
|
// returns true
|
|
```
|
|
|
|
</section>
|
|
|
|
<!-- /.notes -->
|
|
|
|
<section class="examples">
|
|
|
|
## Examples
|
|
|
|
<!-- eslint-disable object-curly-newline, object-curly-spacing -->
|
|
|
|
<!-- eslint no-undef: "error" -->
|
|
|
|
```javascript
|
|
var isInheritedProperty = require( '@stdlib/assert/is-inherited-property' );
|
|
|
|
var bool = isInheritedProperty( {}, 'hasOwnProperty' );
|
|
// returns true
|
|
|
|
bool = isInheritedProperty( { 'a': 'b' }, 'a' );
|
|
// returns false
|
|
|
|
bool = isInheritedProperty( { 'a': 'b' }, 'c' );
|
|
// returns false
|
|
|
|
bool = isInheritedProperty( { 'a': 'b' }, null );
|
|
// returns false
|
|
|
|
bool = isInheritedProperty( null, 'a' );
|
|
// returns false
|
|
|
|
bool = isInheritedProperty( void 0, 'a' );
|
|
// returns false
|
|
|
|
bool = isInheritedProperty( { 'null': false }, null );
|
|
// returns false
|
|
|
|
bool = isInheritedProperty( { '[object Object]': false }, {} );
|
|
// returns false
|
|
```
|
|
|
|
</section>
|
|
|
|
<!-- /.examples -->
|
|
|
|
<section class="links">
|
|
|
|
</section>
|
|
|
|
<!-- /.links -->
|