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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.
I couldn't get them to work, but toLocaleUpperCase and toLocaleLowerCase work like a charm
They work. Maybe you're not using it in the right place
toUpperCase() e toLowerCase() not works