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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.
All production code cares about is performance and code clarity. Sometimes that means a one-liner, sometimes it means breaking things out into variables and functions and classes and modules!
People here mostly love one-liners because they're fun to write.