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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.
Thanks for showing this. I tried charAt() and it told me it couldn't make a string with it. Now I see that just adding "" at the start allows you to build a string out of chars using charAt().