public function deleteValue(string $key) : void
    {
        if (isset($this->map[$key])) {
            unset($this->map[$key]);
        }
    }
public function deleteValue(string $key) : void
    {
        if (isset($this->map[$key])) {
            unset($this->map[$key]);
        }
    }
public function deleteValue ( string $ key ) : void { if ( isset ( $ this -> map [ $ key ] ) ) { unset ( $ this -> map [ $ key ] ) ; } }
Delete a value from the map based on the key
@param string $key
Delete a value from the map based on the key