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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.
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There already are kata about sorting lists, and about grouping lists. If you really want links to originals, I can find 'em. ( I have a
groupBykata myself .. )Duplicate.
Spare us the input validation. See Docs -> Authoring -> Guidelines -> Kata Authoring Guidelines -> Task and Requirements -> Keep kata focused on one task. "Do one thing, and do it well."
Possibly spare us the splitting the string as well, because the function name indicates you are interested in sorting and grouping arrays with generic elements. Strings as encodings are suspicious and overrated. Use appropriate datatypes!
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