# isInfinitef
> Test if a single-precision floating-point numeric value is infinite.
## Usage
```javascript
var isInfinitef = require( '@stdlib/math/base/assert/is-infinitef' );
```
#### isInfinitef( x )
Tests if a single-precision floating-point `numeric` value is infinite.
```javascript
var bool = isInfinitef( Infinity );
// returns true
bool = isInfinitef( -Infinity );
// returns true
```
## Examples
```javascript
var PINF = require( '@stdlib/constants/float32/pinf' );
var NINF = require( '@stdlib/constants/float32/ninf' );
var isInfinitef = require( '@stdlib/math/base/assert/is-infinitef' );
var bool = isInfinitef( PINF );
// returns true
bool = isInfinitef( NINF );
// returns true
bool = isInfinitef( 5.0 );
// returns false
bool = isInfinitef( NaN );
// returns false
```