Q:

get NSTableView cell values

I am new to OSX coding and coding a mac OS app. 
How can I access the text from rows that the user has selected.
In this particular case, I am allowing users to select multiple rows to delete from the database in one go and is why I need to retrieve the text that I'm using as keys in the database.
Working in the console screen, here is a simplified version of what I'm tring to do.
import Cocoa
import Foundation

extension MainViewController {

  func tableViewSelectionDidChange(_ notification: Notification) {

    let myColumn = 0                          // -- first column
    let myRow = tableViewFolders.selectedRow  // -- row int index clicked

    let myCell:String = "?"  // -- ?get row or cell as string and/or array

    print("myColumn: \(myColumn)")
    print("myRow: \(myRow)")
    print("myCell: \(myCell)")

  }

A:

Here is the simplest form of an answer I was able to figure out.
This is only one column but I see no reason it would not work for multi-column tables.  You'd have to access each column element using a column index after retrieving the row.
In a nutshell, I have an in-memory array.
That array has been loaded into a tableView.
Here is the code to get the rows that the user has hilited and do something with those rows.  Here I am just printint it to the console.
import Cocoa
import Foundation

extension MainViewController {
    // -----------------------------------------------------------
    // -- Note: that myDataArray is loaded and in memory
    // -- that data is now showing inside of the tableView
    // -- now we want to do something with the rows the user
    // -- has selected.
    // -- also note: I'm only accessing a single column tableView
    // -----------------------------------------------------------

    func tableViewSelectionDidChange(_ notification: Notification) {

        // -----------------------------------------------------------
        // -- this is an array to store the selected rows data
        // -- in my case this is actually an instance array
        // -- in which I call .removeAll() on
        // -----------------------------------------------------------
        selectedRowsData[String] = []

        // -----------------------------------------------------------
        // -- get the set of indexes for the rows that are selected
        // -----------------------------------------------------------
        // -- myTableView.selectedRowIndexes 
        // --    this is an index set containing 
        // --    the indexes of the selected rows
        let selectedIndexSet = myTableView.selectedRowIndexes     

        // -----------------------------------------------------------
        // -- if your curious this is the quantity of rows selected
        // -- we will be looping through this set in a moment
        // -- selectedIndexSet returns '# indexes' literally
        // -- this index set contains something like ["2", "5", "9"]
        // -- etc...
        // -----------------------------------------------------------
        // print("selectedIndexSet: There are \(selectedIndexSet)")

        // -----------------------------------------------------------
        // -- loop through the index set and extract 
        // -- from the original data array "myDataArray"
        // -- the value that each row index points to
        // -----------------------------------------------------------
        for index in selectedIndexSet {  
            if index > -1 {
                // -----------------------------------------------------------
                // -- append the actual data to selectedRowsData
                // -- this will provide quoted string comma separated data 
                // -- ["dataA", "dataB", "more data here"]
                // -----------------------------------------------------------
                selectedRowsData.append(myDataArray.self[index])
            }
        }
        print("selectedRowsData \n \(selectedRowsData)")
    }
}

