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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.
No example tests in ruby.
ad duplicate: In Ruby, this is even easier than the Vowel Remover kata (look at this solution)
As @Voile mentioned, this topic of removing vowels from either an array or a string has already been covered by Vowel Remover (8kyu) which means that this Kata fails to present novel content to the user undertaking it. The lack of novel content in a Kata as an Issue is recognised as an official CW stance so I would suggest that you unpublish this Kata and come up with a much better idea.