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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.
you get number 5 from $vowels, it's just a coincidence that was 5. if parameters change like "abracadabara" it's not make sense.
You are right, it was so long time ago...
However, we always drop multiplier in complexity measurement, so it will be O(n)
I guess the time complexity is 5 * O(n)
Very clean!