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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.
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Nesting ternary operators is not a good practice.
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This should be 7kyu.
Very clever!
Could be refactored to take advantage of Java 9's map initialization.
Clever, but I don't see how nesting ternary operators is a good practice.
You should always try to find methods, with out withour Google. Is the way to learn!
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I miss the class Mom
If there's no solution, better return an empty array than null.