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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.
This is definitely not a good practice. Whenever you see a literal true or false you should always ask yourself if you can get rid of it by analyzing the boolean expression. Most of the time you only need to return the result of the boolean expression, as in this case.
You don't need ternany operator.