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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.
[].index(nil)returns nil.nil || 0would give you 0.[].delete_at(0)is a no-op where as[].delete_at(nil)throws an exception.I'm not sure I understand, you are deleting at the index of the element with smallest value OR zero? Does zero just get selected when numbers.index(numbers.min) throws up an error due to a nil array? Very clever, just not sure how the zero would be selected