need help in understanding one line code

I need to remove the function save(),
but this function is used by another function data_remove(),

I don’t understand this line:
return ( $save === true ) ? $this->save() : true;

If I removed save() function, how can I modify this line to keep the data_remove() working?

The 2 functions currently working in a plugin as following:

function data_remove( $save = false ) {
        $this->_data_obj = null;
        return ( $save === true ) ? $this->save() : true;
    }

    function save(){
        // some codes here to save all data into database table
        return true;
    }