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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.
Hi @Yassinmoh - it seems you are working in JavaScript; there are 65,000 solves in that language so tests seem to be working OK.
As your error message says - you are returning the value
10. The kata says: "...If that value has more than one digit, continue reducing in this way until a single-digit number is produced."10has more than one digit, so your solution is not correct, you need to keep performing the algorithm one more step (probably in your code you have something likewhen n <= 10: stop loopwhich should be<instead of<=)