public function execute(array $args, FunctionProphecy $function)
    {
        return count($args) > $this->index ? $args[$this->index] : null;
    }
public function execute(array $args, FunctionProphecy $function)
    {
        return count($args) > $this->index ? $args[$this->index] : null;
    }
public function execute ( array $ args , FunctionProphecy $ function ) { return count ( $ args ) > $ this -> index ? $ args [ $ this -> index ] : null ; }
Returns nth argument if has one, null otherwise.

@param array          $args
@param FunctionProphecy $function

@return null|mixed
Returns nth argument if has one null otherwise .