# isInfinite
> Test if a double-precision floating-point numeric value is infinite.
## Usage
```javascript
var isInfinite = require( '@stdlib/math/base/assert/is-infinite' );
```
#### isInfinite( x )
Tests if a double-precision floating-point `numeric` value is infinite.
```javascript
var bool = isInfinite( Infinity );
// returns true
bool = isInfinite( -Infinity );
// returns true
```
## Examples
```javascript
var PINF = require( '@stdlib/constants/float64/pinf' );
var NINF = require( '@stdlib/constants/float64/ninf' );
var isInfinite = require( '@stdlib/math/base/assert/is-infinite' );
var bool = isInfinite( PINF );
// returns true
bool = isInfinite( NINF );
// returns true
bool = isInfinite( 5.0 );
// returns false
bool = isInfinite( NaN );
// returns false
```