# asinh
> Compute the [hyperbolic arcsine][hyperbolic-arcsine] of a number.
## Usage
```javascript
var asinh = require( '@stdlib/math/base/special/asinh' );
```
#### asinh( x )
Computes the [hyperbolic arcsine][hyperbolic-arcsine] of a `number` (in radians).
```javascript
var v = asinh( 0.0 );
// returns 0.0
v = asinh( -0.0 );
// returns -0.0
v = asinh( 2.0 );
// returns ~1.444
v = asinh( -2.0 );
// returns ~-1.444
v = asinh( NaN );
// returns NaN
v = asinh( -Infinity );
// returns -Infinity
v = asinh( Infinity );
// returns Infinity
```
## Examples
```javascript
var linspace = require( '@stdlib/array/linspace' );
var asinh = require( '@stdlib/math/base/special/asinh' );
var x = linspace( -5.0, 5.0, 100 );
var i;
for ( i = 0; i < x.length; i++ ) {
console.log( asinh( x[ i ] ) );
}
```
[hyperbolic-arcsine]: https://en.wikipedia.org/wiki/Inverse_hyperbolic_function