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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Same thing in my solution where I downcased twice, not necessary. Only had to be done once.
Iterate once. Keep track of x's and o's. Compare their length at the end.
n < 2n
The tests didn't check for up/down cases? I wrote code that checks left/right, never up/down, and it passed. Weak.
Found a bug in testing.
My code checked all horizontals, verticals, and ONLY the first square (the top left one). and it passed. Tests should be more thorough and test at least the corners.