public function separator(string $value = null)
    {
        if (null === $value) {
            return $this->separator;
        }
        $this->separator = $value;
        return $this;
    }
public function separator(string $value = null)
    {
        if (null === $value) {
            return $this->separator;
        }
        $this->separator = $value;
        return $this;
    }
public function separator ( string $ value = null ) { if ( null === $ value ) { return $ this -> separator ; } $ this -> separator = $ value ; return $ this ; }
Separator getter and setter.

@param  string $value
@return self|string
Separator getter and setter .