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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.
Well ok, but it still doesn't work here, because your code is flawed. Check it again with str of a few spaces.
TypeError: Cannot read property 'toUpperCase' of undefinedbut the code is working perfectly in the browser console