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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.
I don't think there's much of a difference, at least performance wise, to calling lower() on the whole string or each individual character. Strings are, in actuality, just character arrays. By calling lower() on the whole string, the function must still be applied to each individual character.
I know it but i dont know the third argument