When I run the following:
(for [y (range 4)] (for [x (range 4)] (println x y)))
I get what I expect - 0 0, 1 0, 2 0, 3 0 etc., but at the end of
each y loop I also get 4 nils.
((0 0
1 0
2 0
3 0
nil nil nil nil) (0 1
1 1
2 1
3 1
nil nil nil nil) (0 2
What's going on? And how do I fix it? Adding a :when to test for
nil does not seem to do anything.
Bill
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