# isNegativeZero
> Test if a value is a number equal to negative zero.
## Usage
```javascript
var isNegativeZero = require( '@stdlib/assert/is-negative-zero' );
```
#### isNegativeZero( value )
Tests if a `value` is a `number` having a value equal to negative zero.
```javascript
var Number = require( '@stdlib/number/ctor' );
var bool = isNegativeZero( -0.0 );
// returns true
bool = isNegativeZero( new Number( -0.0 ) );
// returns true
bool = isNegativeZero( -3.14 );
// returns false
bool = isNegativeZero( 0.0 );
// returns false
bool = isNegativeZero( null );
// returns false
```
#### isNegativeZero.isPrimitive( value )
Tests if a `value` is a primitive `number` equal to negative zero.
```javascript
var Number = require( '@stdlib/number/ctor' );
var bool = isNegativeZero.isPrimitive( -0.0 );
// returns true
bool = isNegativeZero.isPrimitive( new Number( -0.0 ) );
// returns false
```
#### isNegativeZero.isObject( value )
Tests if a `value` is a `Number` object having a value equal to negative zero.
```javascript
var Number = require( '@stdlib/number/ctor' );
var bool = isNegativeZero.isObject( -0.0 );
// returns false
bool = isNegativeZero.isObject( new Number( -0.0 ) );
// returns true
```
## Examples
```javascript
var Number = require( '@stdlib/number/ctor' );
var isNegativeZero = require( '@stdlib/assert/is-negative-zero' );
var bool = isNegativeZero( -0.0 );
// returns true
bool = isNegativeZero( new Number( -0.0 ) );
// returns true
bool = isNegativeZero( -3.14 );
// returns false
bool = isNegativeZero( 0.0 );
// returns false
bool = isNegativeZero( 5.0 );
// returns false
bool = isNegativeZero( '-0' );
// returns false
bool = isNegativeZero( null );
// returns false
```