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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.
Idiomatic in PL means "as intended by language authors", "according to idioms on which the language was designed". And because language authors usually know better how the language should work, idiomatic is good.
What does "idiomatic" mean? And why is it a good thing?
Writing a function to do the work of a builtin isn't very idiomatic though either.