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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 really like this solution! For the sumDigits function, maybe
Character::getNumericValuewould work, too.Outside the US, the word 'American" can refer to anyone from the Americas, i.e. Canadians, too. Usually no factor, though.
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Please replace
new Double()withDouble.valueOf()to better comply with Java 11.