132 lines
2.6 KiB
Markdown
132 lines
2.6 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.
|
||
|
|
|
||
|
|
-->
|
||
|
|
|
||
|
|
# isSymbol
|
||
|
|
|
||
|
|
> Test if a value is a [symbol][mdn-symbol].
|
||
|
|
|
||
|
|
<section class="usage">
|
||
|
|
|
||
|
|
## Usage
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var isSymbol = require( '@stdlib/assert/is-symbol' );
|
||
|
|
```
|
||
|
|
|
||
|
|
#### isSymbol( value )
|
||
|
|
|
||
|
|
Tests if a value is a [symbol][mdn-symbol].
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var Symbol = require( '@stdlib/symbol/ctor' );
|
||
|
|
|
||
|
|
var bool = isSymbol( Symbol( 'beep' ) );
|
||
|
|
// returns true
|
||
|
|
|
||
|
|
bool = isSymbol( Object( Symbol( 'beep' ) ) );
|
||
|
|
// returns true
|
||
|
|
```
|
||
|
|
|
||
|
|
#### isSymbol.isPrimitive( value )
|
||
|
|
|
||
|
|
Tests if a `value` is a primitive [symbol][mdn-symbol].
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var Symbol = require( '@stdlib/symbol/ctor' );
|
||
|
|
|
||
|
|
var bool = isSymbol.isPrimitive( Symbol( 'beep' ) );
|
||
|
|
// returns true
|
||
|
|
|
||
|
|
bool = isSymbol.isPrimitive( Object( Symbol( 'boop' ) ) );
|
||
|
|
// returns false
|
||
|
|
```
|
||
|
|
|
||
|
|
#### isSymbol.isObject( value )
|
||
|
|
|
||
|
|
Tests if a `value` is a [`Symbol`][mdn-symbol] object.
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var Symbol = require( '@stdlib/symbol/ctor' );
|
||
|
|
|
||
|
|
var bool = isSymbol.isObject( Symbol( 'beep' ) );
|
||
|
|
// returns false
|
||
|
|
|
||
|
|
bool = isSymbol.isObject( Object( Symbol( 'boop' ) ) );
|
||
|
|
// returns true
|
||
|
|
```
|
||
|
|
|
||
|
|
</section>
|
||
|
|
|
||
|
|
<!-- /.usage -->
|
||
|
|
|
||
|
|
<section class="examples">
|
||
|
|
|
||
|
|
## Examples
|
||
|
|
|
||
|
|
<!-- eslint-disable no-restricted-syntax, no-empty-function -->
|
||
|
|
|
||
|
|
<!-- eslint no-undef: "error" -->
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
var hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' );
|
||
|
|
var Symbol = require( '@stdlib/symbol/ctor' );
|
||
|
|
var isSymbol = require( '@stdlib/assert/is-symbol' );
|
||
|
|
|
||
|
|
var bool;
|
||
|
|
if ( hasSymbolSupport() ) {
|
||
|
|
bool = isSymbol( Symbol( 'beep' ) );
|
||
|
|
// returns true
|
||
|
|
} else {
|
||
|
|
console.log( 'Environment does not support symbols.' );
|
||
|
|
}
|
||
|
|
bool = isSymbol( 'beep' );
|
||
|
|
// returns false
|
||
|
|
|
||
|
|
bool = isSymbol( {} );
|
||
|
|
// returns false
|
||
|
|
|
||
|
|
bool = isSymbol( [] );
|
||
|
|
// returns false
|
||
|
|
|
||
|
|
bool = isSymbol( null );
|
||
|
|
// returns false
|
||
|
|
|
||
|
|
bool = isSymbol( void 0 );
|
||
|
|
// returns false
|
||
|
|
|
||
|
|
bool = isSymbol( true );
|
||
|
|
// returns false
|
||
|
|
|
||
|
|
bool = isSymbol( function foo() {} );
|
||
|
|
// returns false
|
||
|
|
```
|
||
|
|
|
||
|
|
</section>
|
||
|
|
|
||
|
|
<!-- /.examples -->
|
||
|
|
|
||
|
|
<section class="links">
|
||
|
|
|
||
|
|
[mdn-symbol]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol
|
||
|
|
|
||
|
|
</section>
|
||
|
|
|
||
|
|
<!-- /.links -->
|