Newbie Question #3: Modifying Table Data

There are a lot of ways you can do this, but here is one way:

#target framemaker
var hero = ['Superman', 'Spiderman', 'Wonder Woman'];
var fName = ['Clark', 'Peter', 'Diana'];
var lName = ['Kent', 'Parker', 'Prince'];
var doc, tbl, row, cell, textLoc;
doc = app.ActiveDoc;
// Click in the table before running this.
tbl = doc.SelectedTbl;
// Populate the heading row.
row = tbl.FirstRowInTbl;
cell = row.FirstCellInRow;
while (cell.ObjectValid () === 1) {
    textLoc = new TextLoc (cell.FirstPgf, 0);
    if (cell.CellColNum === 0) {
        doc.AddText (textLoc, "Hero");
    }
    else if (cell.CellColNum === 1) {
        doc.AddText (textLoc, "First Name");
    }
    else if (cell.CellColNum === 2) {
        doc.AddText (textLoc, "Last Name");
    }
    cell = cell.NextCellInRow;
}
// Populate the body rows.
row = row.NextRowInTbl;
cell = row.FirstCellInRow;
while (cell.ObjectValid () === 1) {
    if (cell.CellColNum === 0) {
        populateColumn (cell, hero, doc);
    }
    else if (cell.CellColNum === 1) {
        populateColumn (cell, fName, doc);
    }
    else if (cell.CellColNum === 2) {
        populateColumn (cell, lName, doc);
    }
    cell = cell.NextCellInRow;
}
function populateColumn (cell, list, doc) {
    
    var counter, textLoc;
    
    counter = 0;
    while (cell.ObjectValid () === 1) {
        textLoc = new TextLoc (cell.FirstPgf, 0);
        doc.AddText (textLoc, list[counter]);
        counter = counter + 1;
        if (counter === list.length) {
            break;
        }
        cell = cell.CellBelowInCol;
    }
}