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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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Could be because it looks cleaner?
The only advantage is less code as you said.
In most cases, using if/else is recommanded for readability.