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# isNumber

> Test if a value is a number.

<section class="usage">

## Usage

```javascript
var isNumber = require( '@stdlib/assert/is-number' );
```

#### isNumber( value )

Tests if a `value` is a `number`.

<!-- eslint-disable no-new-wrappers -->

```javascript
var Number = require( '@stdlib/number/ctor' );

var bool = isNumber( 3.14 );
// returns true

bool = isNumber( new Number( 3.14 ) );
// returns true

bool = isNumber( NaN );
// returns true

bool = isNumber( null );
// returns false
```

#### isNumber.isPrimitive( value )

Tests if a `value` is a primitive `number`.

<!-- eslint-disable no-new-wrappers -->

```javascript
var Number = require( '@stdlib/number/ctor' );

var bool = isNumber.isPrimitive( 3.14 );
// returns true

bool = isNumber.isPrimitive( NaN );
// returns true

bool = isNumber.isPrimitive( new Number( 3.14 ) );
// returns false
```

#### isNumber.isObject( value )

Tests if a `value` is a `Number` object.

<!-- eslint-disable no-new-wrappers -->

```javascript
var Number = require( '@stdlib/number/ctor' );

var bool = isNumber.isObject( 3.14 );
// returns false

bool = isNumber.isObject( new Number( 3.14 ) );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint-disable no-new-wrappers -->

<!-- eslint no-undef: "error" -->

```javascript
var Number = require( '@stdlib/number/ctor' );
var isNumber = require( '@stdlib/assert/is-number' );

var bool = isNumber( 5 );
// returns true

bool = isNumber( new Number( 5 ) );
// returns true

bool = isNumber( NaN );
// returns true

bool = isNumber( '5' );
// returns false

bool = isNumber( null );
// returns false
```

</section>

<!-- /.examples -->

<section class="links">

</section>

<!-- /.links -->