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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.
Using Ruby
"Sudoku with invalid boxes (little squares), but valid rows and columns - Expected: false, instead got: true".
What "little squares"? I can't see the data I'm testing against. I'm currently checking to see if a given element is_a?(Integer) so I don't see why this error would crop up.
Unpack returns an array, and * is just a shorthand method to join the array as a string by the supplied delimiter ('.')
If he really wants 8...