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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.
This comment is hidden because it contains spoiler information about the solution
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I did it in JavaScript. Log is always correct, Default Test passed and Value 0 passed too. Other results are undefined? Tried with assertEquals and assertSimilar. If result is more than one digit I call function digital_root again with new value until single digit. Works well at home but cannot attempt in kata. Why???