# isNegativeZerof
> Test if a single-precision floating-point numeric value is negative zero.
## Usage
```javascript
var isNegativeZerof = require( '@stdlib/math/base/assert/is-negative-zerof' );
```
#### isNegativeZerof( x )
Tests if a single-precision floating-point `numeric` value is negative zero.
```javascript
var bool = isNegativeZerof( -0.0 );
// returns true
bool = isNegativeZerof( 0.0 );
// returns false
```
## Examples
```javascript
var isNegativeZerof = require( '@stdlib/math/base/assert/is-negative-zerof' );
var bool = isNegativeZerof( -0.0 );
// returns true
bool = isNegativeZerof( 0.0 );
// returns false
bool = isNegativeZerof( 5.0 );
// returns false
bool = isNegativeZerof( -1.0 );
// returns false
bool = isNegativeZerof( NaN );
// returns false
```