# Unary
> Constructor for creating arrays filled with pseudorandom values drawn from a unary PRNG.
## Usage
```javascript
var Random = require( '@stdlib/random/array/tools/unary' );
```
#### Random( prng, dtypes, dtype )
Constructor for creating arrays filled with pseudorandom values drawn from a unary PRNG.
```javascript
var exponential = require( '@stdlib/random/base/exponential' );
var dtypes = [ 'float64', 'float32', 'generic' ];
var defaultDType = 'float64';
var random = new Random( exponential, dtypes, defaultDType );
```
The constructor has the following parameters:
- **prng**: unary pseudorandom value generator.
- **dtypes**: list of supported output data types.
- **dtype**: default output data type.
#### Random.prototype.generate( len, param1\[, options] )
Returns an array filled with pseudorandom values drawn from a unary PRNG.
```javascript
var exponential = require( '@stdlib/random/base/exponential' );
var dtypes = [ 'float64', 'float32', 'generic' ];
var defaultDType = 'float64';
var random = new Random( exponential, dtypes, defaultDType );
var v = random.generate( 10, 2.0 );
// returns
```
The method has the following parameters:
- **len**: output array length.
- **param1**: PRNG parameter.
- **options**: function options.
The method accepts the following options:
- **dtype**: output array data type. Setting this option, overrides the default output array data type.
By default, the method returns an array having the default output array data type. To override the default, set the `dtype` option.
```javascript
var exponential = require( '@stdlib/random/base/exponential' );
var dtypes = [ 'float64', 'float32', 'generic' ];
var defaultDType = 'float64';
var random = new Random( exponential, dtypes, defaultDType );
var v = random.generate( 10, 2.0, {
'dtype': 'float32'
});
// returns
```
#### Random.prototype.assign( param1, out )
Fills an array with pseudorandom values drawn from a unary PRNG.
```javascript
var exponential = require( '@stdlib/random/base/exponential' );
var zeros = require( '@stdlib/array/zeros' );
var dtypes = [ 'float64', 'float32', 'generic' ];
var defaultDType = 'float64';
var random = new Random( exponential, dtypes, defaultDType );
var out = zeros( 10, 'float64' );
// returns
var v = random.assign( 2.0, out );
// returns
var bool = ( v === out );
// returns true
```
The method has the following parameters:
- **param1**: PRNG parameter.
- **out**: output array.
## Examples
```javascript
var exponential = require( '@stdlib/random/base/exponential' );
var dtypes = require( '@stdlib/array/dtypes' );
var Random = require( '@stdlib/random/array/tools/unary' );
var dt = dtypes( 'real_floating_point_and_generic' );
var random = new Random( exponential, dt, 'float64' );
var x = random.generate( 10, 2.0 );
// returns
x = random.generate( 10, 2.0, {
'dtype': 'float32'
});
// returns
x = random.generate( 10, 2.0, {
'dtype': 'generic'
});
// returns [...]
```