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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.
An explicit return in a one liner method, while techincally fine, doesn't feel very rubyish
I'd argue there's really no need for explicit return in a one-line method, though.
I think this is best practice. Despite Ruby allowance of implicit return explicit is always more clear, especially in longer methods.