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