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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.
ok sorry,But im just beginner and i dont know how to deal with the site perfectly .
I would not use the ISSUE tag for general questions you have about a language. Use it if you think there is an issue with the kata instead.
In JS, you can "return null;".
how can i return null in js ?