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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.
If '1' and 1 should be treated as different elements, then shouldn't arraysSimilar([1, '1', 2], ['1', 1, 2]) return true? I think sort-based solutions will return false in that case. Would be nice if the description was more specific on this point. Edit: sort with the standard comparison function won't work, a custom one could.