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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.
because undefined is passed into the parameter
_idthis is how babel compiles the code and is not an issue.
You shouldn't have to create a special case to get around this..