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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.
RUBY:
You really need to consider how fast the methods you use are.
There is a ruby method to create array very fast.
Your sample tests should run in 1-2ms if you want to avoid timeout on random tests.
I'm a bit disappointed in this exercice.
If you don't have one precise method you won't succeed regardless of you smart you can be.