[ohyes]

I disagree with absolutely everything that you wrote. I use flet/labels/map/reduce all the time.

I find that in certain places avoiding statefulness can be a readability advantage.

Nothing wrong with using an array as it is simple and easy to understand.

I probably would have used the symbols :x and :o or 'x and 'o (with eql), just for readability, however.

:-)