135 lines
2.3 KiB
Markdown
135 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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# isNaN
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> Test if a value is NaN.
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<section class="usage">
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## Usage
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```javascript
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var isnan = require( '@stdlib/assert/is-nan' );
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```
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#### isnan( value )
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Tests if a `value` is `NaN`.
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<!-- eslint-disable no-new-wrappers -->
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```javascript
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var Number = require( '@stdlib/number/ctor' );
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var bool = isnan( NaN );
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// returns true
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bool = isnan( new Number( NaN ) );
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// returns true
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bool = isnan( 3.14 );
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// returns false
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bool = isnan( null );
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// returns false
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```
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#### isnan.isPrimitive( value )
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Tests if a `value` is a `NaN` primitive `number`.
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<!-- eslint-disable no-new-wrappers -->
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```javascript
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var Number = require( '@stdlib/number/ctor' );
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var bool = isnan.isPrimitive( NaN );
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// returns true
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bool = isnan.isPrimitive( 3.14 );
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// returns false
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bool = isnan.isPrimitive( new Number( NaN ) );
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// returns false
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```
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#### isnan.isObject( value )
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Tests if a `value` is a `Number` object having a value of `NaN`.
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<!-- eslint-disable no-new-wrappers -->
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```javascript
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var Number = require( '@stdlib/number/ctor' );
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var bool = isnan.isObject( NaN );
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// returns false
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bool = isnan.isObject( new Number( NaN ) );
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// returns true
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```
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</section>
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<!-- /.usage -->
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<section class="examples">
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## Examples
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<!-- eslint-disable no-new-wrappers -->
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<!-- eslint no-undef: "error" -->
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```javascript
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var Number = require( '@stdlib/number/ctor' );
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var Symbol = require( '@stdlib/symbol/ctor' );
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var isnan = require( '@stdlib/assert/is-nan' );
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var bool = isnan( NaN );
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// returns true
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bool = isnan( new Number( NaN ) );
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// returns true
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bool = isnan( 5 );
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// returns false
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bool = isnan( '5' );
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// returns false
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bool = isnan( null );
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// returns false
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bool = isnan( Symbol( 'NaN' ) );
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// returns false
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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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