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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.
First point is correct but your second point is wrong. Becuase zero is falsy as well your suggested filter function would drop 0 from the result and fail when the first letter is upper case.
The first iteration will compare the first element and
undefined.iterable[-1]does not wrap around but will returnundefinedas there is no index -1.iterable.at(-1)is required to wrap around and get the last element of an array.