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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.
Because the number of solutions already registered (>1300) I think now kata can not be changed.
As already mentioned, there're some corner cases, that don't fit.
Test.assertEquals(last(), undefined); //-- undefined
Test.assertEquals(last(1, [2, 3]), [2, 3]);//-- last item is array