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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.
Hello there!
Did you return the value or print it to the screen?
Once I spent a good 5 minutes figuring out what the problem might be, when in a similar situation as you, then I realised I didn't actually return the value from the function, just used print.
Cheers!