public function get(string $key)
    {
        return isset($this->props[$key]) ? $this->props[$key] : null;
    }
public function get(string $key)
    {
        return isset($this->props[$key]) ? $this->props[$key] : null;
    }
public function get ( string $ key ) { return isset ( $ this -> props [ $ key ] ) ? $ this -> props [ $ key ] : null ; }
get single value based on key

@return mixed|null value of the requested key
get single value based on key