The key is in the three for...each statements that we used. One loops through the array of table header strings, and appends a table cell (td) element with each value into the thead row. There are then two nested .forEach() statements that do the same for each row in the body. We technically only have one row in the body right now, so probably didn't need that messy double for...each, but now all we have to do to add another row to the table is simply append another data array to the rows variable. We'll talk more about Array.prototype.forEach and other array functions in the next chapter.
This might seem like a lot of work for such a simple table, but the advantages of doing it this way are huge. Instead of wasting a bunch of time typing out a totally static table that you'll never use again, you've effectively created a basic JavaScript library that will produce a basic table for you whenever you need it. You could even extend your tableFactory function to do...
